using System.Collections;
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using System.Data;
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using System.Data.SqlClient;
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using NewPdaSqlServer.util;
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namespace NewPdaSqlServer.DB;
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/// <summary>
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/// 数据访问类
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/// </summary>
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public abstract class DbHelperSQL
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{
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//数据库连接字符串(web.config来配置)
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public static readonly string strConn =
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AppsettingsUtility.Settings.DataBaseConn;
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#region 公用方法
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/// <summary>
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/// 取到最大字段值
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/// </summary>
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/// <param name="FieldName"></param>
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/// <param name="TableName"></param>
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/// <returns></returns>
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public static int GetMaxID(string FieldName, string TableName)
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{
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var strsql = "select max(" + FieldName + ") from " + TableName;
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var obj = GetSingle(strsql);
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if (obj == null)
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return 0;
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return int.Parse(obj.ToString());
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}
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/// <summary>
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/// 是否存在某条记录
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/// </summary>
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/// <param name="strSql"></param>
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/// <param name="cmdParms"></param>
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/// <returns></returns>
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public static bool Exists(string strSql, params SqlParameter[] cmdParms)
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{
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var obj = GetSingle(strSql, cmdParms);
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int cmdresult;
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if (Equals(obj, null) || Equals(obj, DBNull.Value))
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cmdresult = 0;
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else
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cmdresult = int.Parse(obj.ToString());
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if (cmdresult == 0)
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return false;
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return true;
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}
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#endregion
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#region 执行简单SQL语句
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/// <summary>
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/// 执行SQL语句，返回影响的记录数
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/// </summary>
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/// <param name="SQLString">SQL语句</param>
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/// <returns>影响的记录数</returns>
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public static int ExecuteSql(string SQLString)
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{
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using (var connection = new SqlConnection(strConn))
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{
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using (var cmd = new SqlCommand(SQLString, connection))
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{
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try
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{
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connection.Open();
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var rows = cmd.ExecuteNonQuery();
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return rows;
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}
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catch (SqlException E)
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{
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connection.Close();
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throw new Exception(E.Message);
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}
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}
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}
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}
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/// <summary>
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/// 执行多条SQL语句，实现数据库事务。
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/// </summary>
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/// <param name="SQLStringList">多条SQL语句</param>
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public static void ExecuteSqlTran(ArrayList SQLStringList)
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{
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using (var conn = new SqlConnection(strConn))
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{
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conn.Open();
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var cmd = new SqlCommand();
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cmd.Connection = conn;
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var tx = conn.BeginTransaction();
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cmd.Transaction = tx;
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try
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{
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for (var n = 0; n < SQLStringList.Count; n++)
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{
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var strsql = SQLStringList[n].ToString();
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if (strsql.Trim().Length > 1)
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{
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cmd.CommandText = strsql;
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cmd.ExecuteNonQuery();
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}
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}
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tx.Commit();
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}
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catch (SqlException E)
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{
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tx.Rollback();
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throw new Exception(E.Message);
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}
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}
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}
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/// <summary>
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/// 执行带一个存储过程参数的的SQL语句。
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/// </summary>
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/// <param name="SQLString">SQL语句</param>
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/// <param name="content">参数内容,比如一个字段是格式复杂的文章，有特殊符号，可以通过这个方式添加</param>
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/// <returns>影响的记录数</returns>
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public static int ExecuteSql(string SQLString, string content)
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{
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using (var connection = new SqlConnection(strConn))
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{
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var cmd = new SqlCommand(SQLString, connection);
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var myParameter = new SqlParameter("@content", SqlDbType.NText);
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myParameter.Value = content;
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cmd.Parameters.Add(myParameter);
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try
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{
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connection.Open();
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var rows = cmd.ExecuteNonQuery();
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return rows;
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}
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catch (SqlException E)
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{
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throw new Exception(E.Message);
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}
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finally
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{
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cmd.Dispose();
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connection.Close();
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}
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}
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}
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/// <summary>
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/// 向数据库里插入图像格式的字段(和上面情况类似的另一种实例)
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/// </summary>
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/// <param name="strSQL">SQL语句</param>
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/// <param name="fs">图像字节,数据库的字段类型为image的情况</param>
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/// <returns>影响的记录数</returns>
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public static int ExecuteSqlInsertImg(string strSQL, byte[] fs)
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{
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using (var connection = new SqlConnection(strConn))
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{
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var cmd = new SqlCommand(strSQL, connection);
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var myParameter = new SqlParameter("@fs", SqlDbType.Image);
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myParameter.Value = fs;
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cmd.Parameters.Add(myParameter);
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try
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{
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connection.Open();
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var rows = cmd.ExecuteNonQuery();
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return rows;
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}
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catch (SqlException E)
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{
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throw new Exception(E.Message);
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}
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finally
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{
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cmd.Dispose();
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connection.Close();
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}
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}
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}
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/// <summary>
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/// 执行一条计算查询结果语句，返回查询结果（object）。
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/// </summary>
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/// <param name="SQLString">计算查询结果语句</param>
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/// <returns>查询结果（object）</returns>
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public static object GetSingle(string SQLString)
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{
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using (var connection = new SqlConnection(strConn))
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{
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using (var cmd = new SqlCommand(SQLString, connection))
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{
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try
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{
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connection.Open();
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var obj = cmd.ExecuteScalar();
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if (Equals(obj, null) || Equals(obj, DBNull.Value))
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return null;
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return obj;
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}
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catch (SqlException e)
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{
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connection.Close();
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throw new Exception(e.Message);
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}
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}
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}
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}
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/// <summary>
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/// 执行查询语句，返回SqlDataReader
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/// </summary>
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/// <param name="strSQL">查询语句</param>
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/// <returns>SqlDataReader</returns>
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public static SqlDataReader ExecuteReader(string strSQL)
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{
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var connection = new SqlConnection(strConn);
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var cmd = new SqlCommand(strSQL, connection);
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try
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{
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connection.Open();
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var myReader = cmd.ExecuteReader();
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return myReader;
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}
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catch (SqlException e)
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{
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throw new Exception(e.Message);
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}
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}
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/// <summary>
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/// 执行查询语句，返回DataSet
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/// </summary>
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/// <param name="SQLString">查询语句</param>
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/// <returns>DataSet</returns>
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public static DataSet Query(string SQLString)
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{
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using (var connection = new SqlConnection(strConn))
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{
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var ds = new DataSet();
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try
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{
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connection.Open();
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var command = new SqlDataAdapter(SQLString, connection);
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command.Fill(ds, "ds");
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}
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catch (SqlException ex)
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{
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throw new Exception(ex.Message);
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}
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return ds;
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}
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}
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#endregion
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#region 执行带参数的SQL语句
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/// <summary>
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/// 执行SQL语句，返回影响的记录数
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/// </summary>
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/// <param name="SQLString">SQL语句</param>
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/// <returns>影响的记录数</returns>
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public static int ExecuteSql(string SQLString,
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params SqlParameter[] cmdParms)
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{
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using (var connection = new SqlConnection(strConn))
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{
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using (var cmd = new SqlCommand())
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{
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try
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{
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PrepareCommand(cmd, connection, null, SQLString, cmdParms);
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var rows = cmd.ExecuteNonQuery();
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cmd.Parameters.Clear();
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return rows;
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}
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catch (SqlException E)
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{
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throw new Exception(E.Message);
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}
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}
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}
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}
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/// <summary>
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/// 执行多条SQL语句，实现数据库事务。
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/// </summary>
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/// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的SqlParameter[]）</param>
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public static void ExecuteSqlTran(Hashtable SQLStringList)
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{
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using (var conn = new SqlConnection(strConn))
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{
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conn.Open();
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using (var trans = conn.BeginTransaction())
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{
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var cmd = new SqlCommand();
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try
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{
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//循环
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foreach (DictionaryEntry myDE in SQLStringList)
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{
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var cmdText = myDE.Key.ToString();
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var cmdParms = (SqlParameter[])myDE.Value;
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PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
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var val = cmd.ExecuteNonQuery();
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cmd.Parameters.Clear();
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//trans.Commit();
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}
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trans.Commit();
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}
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catch
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{
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trans.Rollback();
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throw;
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}
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}
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}
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}
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/// <summary>
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/// 执行多条SQL语句，实现数据库事务。
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/// </summary>
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/// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的SqlParameter[]）</param>
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public static int ExecuteSqlTranRtn(Hashtable SQLStringList)
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{
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var d = 0;
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using (var conn = new SqlConnection(strConn))
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{
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conn.Open();
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using (var trans = conn.BeginTransaction())
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{
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var cmd = new SqlCommand();
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try
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{
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//循环
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foreach (DictionaryEntry myDE in SQLStringList)
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{
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var cmdText = myDE.Key.ToString();
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var cmdParms = (SqlParameter[])myDE.Value;
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PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
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var val = cmd.ExecuteNonQuery();
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d = d + val;
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cmd.Parameters.Clear();
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//trans.Commit();
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}
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trans.Commit();
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}
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catch
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{
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trans.Rollback();
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throw;
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}
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}
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}
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return d;
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}
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/// <summary>
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/// 执行多条SQL语句，实现数据库事务
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/// </summary>
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/// <param name="SQLStringList">SQL语句的哈希表（key为标识，value是该语句的SqlParameter[]）</param>
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public static void ExecuteSqlTran(string sqltxt, Hashtable SQLStringList)
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{
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using (var conn = new SqlConnection(strConn))
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{
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conn.Open();
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using (var trans = conn.BeginTransaction())
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{
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var cmd = new SqlCommand();
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try
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{
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//循环
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foreach (DictionaryEntry myDE in SQLStringList)
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{
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var cmdText = sqltxt;
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var cmdParms = (SqlParameter[])myDE.Value;
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PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
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var val = cmd.ExecuteNonQuery();
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cmd.Parameters.Clear();
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}
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trans.Commit();
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}
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catch
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{
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trans.Rollback();
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throw;
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}
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}
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}
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}
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/// <summary>
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/// 执行一条计算查询结果语句，返回查询结果（object）。
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/// </summary>
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/// <param name="SQLString">计算查询结果语句</param>
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/// <returns>查询结果（object）</returns>
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public static object GetSingle(string SQLString,
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params SqlParameter[] cmdParms)
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{
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using (var connection = new SqlConnection(strConn))
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{
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using (var cmd = new SqlCommand())
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{
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try
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{
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PrepareCommand(cmd, connection, null, SQLString, cmdParms);
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var obj = cmd.ExecuteScalar();
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cmd.Parameters.Clear();
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if (Equals(obj, null) || Equals(obj, DBNull.Value))
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return null;
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return obj;
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}
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catch (SqlException e)
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{
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throw new Exception(e.Message);
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}
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}
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}
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}
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/// <summary>
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/// 执行查询语句，返回SqlDataReader
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/// </summary>
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/// <param name="strSQL">查询语句</param>
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/// <returns>SqlDataReader</returns>
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public static SqlDataReader ExecuteReader(string SQLString,
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params SqlParameter[] cmdParms)
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{
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var connection = new SqlConnection(strConn);
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var cmd = new SqlCommand();
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try
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{
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PrepareCommand(cmd, connection, null, SQLString, cmdParms);
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var myReader = cmd.ExecuteReader();
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cmd.Parameters.Clear();
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return myReader;
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}
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catch (SqlException e)
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{
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throw new Exception(e.Message);
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}
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}
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/// <summary>
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/// 执行查询语句，返回DataSet
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/// </summary>
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/// <param name="SQLString">查询语句</param>
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/// <returns>DataSet</returns>
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public static DataSet Query(string SQLString,
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params SqlParameter[] cmdParms)
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{
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using (var connection = new SqlConnection(strConn))
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{
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var cmd = new SqlCommand();
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PrepareCommand(cmd, connection, null, SQLString, cmdParms);
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using (var da = new SqlDataAdapter(cmd))
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{
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var ds = new DataSet();
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try
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{
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da.Fill(ds, "ds");
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cmd.Parameters.Clear();
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}
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catch (SqlException ex)
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{
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throw new Exception(ex.Message);
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}
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return ds;
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}
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}
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}
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//private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, string cmdText, SqlParameter[] cmdParms)
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//{
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// if (conn.State != ConnectionState.Open)
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// conn.Open();
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// cmd.Connection = conn;
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// cmd.CommandText = cmdText;
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// if (trans != null)
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// cmd.Transaction = trans;
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// cmd.CommandType = CommandType.Text;//cmdType;
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// if (cmdParms != null)
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// {
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// foreach (SqlParameter parameter in cmdParms)
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// {
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// if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input) &&
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// (parameter.Value == null))
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// {
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// parameter.Value = DBNull.Value;
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// }
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// cmd.Parameters.Add(parameter);
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// }
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// }
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//}
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private static void PrepareCommand(SqlCommand cmd, SqlConnection conn,
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SqlTransaction trans, string cmdText, SqlParameter[] cmdParms)
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{
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if (conn.State != ConnectionState.Open)
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conn.Open();
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cmd.Connection = conn;
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cmd.CommandText = cmdText;
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if (trans != null)
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cmd.Transaction = trans;
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cmd.CommandType = CommandType.Text; //cmdType;
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if (cmdParms != null)
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foreach (var parm in cmdParms)
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{
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//cmd.Parameters.Add(parm);
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if ((parm.Direction == ParameterDirection.InputOutput ||
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parm.Direction == ParameterDirection.Input) &&
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parm.Value == null)
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parm.Value = DBNull.Value;
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cmd.Parameters.Add(parm);
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}
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}
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#endregion
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#region 存储过程操作
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/// <summary>
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/// 执行存储过程
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/// </summary>
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/// <param name="storedProcName">存储过程名</param>
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/// <param name="parameters">存储过程参数</param>
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/// <returns>SqlDataReader</returns>
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public static SqlDataReader RunProcedure(string storedProcName,
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IDataParameter[] parameters)
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{
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var connection = new SqlConnection(strConn);
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SqlDataReader returnReader;
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connection.Open();
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var command = BuildQueryCommand(connection, storedProcName, parameters);
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command.CommandType = CommandType.StoredProcedure;
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returnReader = command.ExecuteReader();
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return returnReader;
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}
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/// <summary>
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/// 执行带输出参数的存储过程
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/// </summary>
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/// <param name="storedProcName">存储过程名</param>
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/// <param name="parameters">存储过程参数,OutName 输出参数的名字（如果是多个以@为分割符）</param>
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/// <returns>string(以|分割的输出参数的值)</returns>
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public static string RunProcedureOut(string storedProcName,
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IDataParameter[] parameters, string outName)
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{
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var connection = new SqlConnection(strConn);
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var returnstring = string.Empty;
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connection.Open();
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var command = BuildQueryCommand(connection, storedProcName, parameters);
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command.CommandType = CommandType.StoredProcedure;
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command.ExecuteNonQuery();
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var str = string.Empty;
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//解析穿过来的参数
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var Arraystr = outName.Split('|');
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foreach (var st in Arraystr)
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{
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var a = st;
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if (str == string.Empty)
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str = command.Parameters[a].Value.ToString();
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else
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str = str + "|" + command.Parameters[a].Value;
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}
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return str;
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}
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/// <summary>
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/// 执行存储过程
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/// </summary>
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/// <param name="storedProcName">存储过程名</param>
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/// <param name="parameters">存储过程参数</param>
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/// <param name="tableName">DataSet结果中的表名</param>
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/// <returns>DataSet</returns>
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public static DataSet RunProcedure(string storedProcName,
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IDataParameter[] parameters, string tableName)
|
{
|
using (var connection = new SqlConnection(strConn))
|
{
|
var dataSet = new DataSet();
|
connection.Open();
|
var sqlDA = new SqlDataAdapter();
|
sqlDA.SelectCommand =
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BuildQueryCommand(connection, storedProcName, parameters);
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sqlDA.Fill(dataSet, tableName);
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connection.Close();
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return dataSet;
|
}
|
}
|
|
/// <summary>
|
/// 构建 SqlCommand 对象(用来返回一个结果集，而不是一个整数值)
|
/// </summary>
|
/// <param name="connection">数据库连接</param>
|
/// <param name="storedProcName">存储过程名</param>
|
/// <param name="parameters">存储过程参数</param>
|
/// <returns>SqlCommand</returns>
|
private static SqlCommand BuildQueryCommand(SqlConnection connection,
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string storedProcName, IDataParameter[] parameters)
|
{
|
var command = new SqlCommand(storedProcName, connection);
|
command.CommandType = CommandType.StoredProcedure;
|
foreach (SqlParameter parameter in parameters)
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command.Parameters.Add(parameter);
|
return command;
|
}
|
|
/// <summary>
|
/// 执行存储过程，返回影响的行数
|
/// </summary>
|
/// <param name="storedProcName">存储过程名</param>
|
/// <param name="parameters">存储过程参数</param>
|
/// <param name="rowsAffected">影响的行数</param>
|
/// <returns></returns>
|
public static int RunProcedure(string storedProcName,
|
IDataParameter[] parameters, out int rowsAffected)
|
{
|
using (var connection = new SqlConnection(strConn))
|
{
|
int result;
|
connection.Open();
|
var command =
|
BuildIntCommand(connection, storedProcName, parameters);
|
rowsAffected = command.ExecuteNonQuery();
|
result = (int)command.Parameters["ReturnValue"].Value;
|
//Connection.Close();
|
return result;
|
}
|
}
|
|
/// <summary>
|
/// 执行存储过程，返回影响行数
|
/// </summary>
|
/// <param name="storedProcName">string类型存储过程名</param>
|
/// <param name="parameters">SqlParameters[]存储过程参数</param>
|
/// <returns>int 影响行数</returns>
|
public static int RunProcedure_NonQuery(string storedProcName,
|
IDataParameter[] parameters)
|
{
|
using (var connection = new SqlConnection(strConn))
|
{
|
connection.Open();
|
var command =
|
BuildQueryCommand(connection, storedProcName, parameters);
|
return command.ExecuteNonQuery();
|
}
|
}
|
|
/// <summary>
|
/// 创建 SqlCommand 对象实例(用来返回一个整数值)
|
/// </summary>
|
/// <param name="storedProcName">存储过程名</param>
|
/// <param name="parameters">存储过程参数</param>
|
/// <returns>SqlCommand 对象实例</returns>
|
private static SqlCommand BuildIntCommand(SqlConnection connection,
|
string storedProcName, IDataParameter[] parameters)
|
{
|
var command = BuildQueryCommand(connection, storedProcName, parameters);
|
command.Parameters.Add(new SqlParameter("ReturnValue",
|
SqlDbType.Int, 4, ParameterDirection.ReturnValue,
|
false, 0, 0, string.Empty, DataRowVersion.Default, null));
|
return command;
|
}
|
|
#endregion
|
}
|
