using System.Collections;
using System.Data;
using System.Data.SqlClient;

namespace Gs.Toolbox;

/// <summary>
///     数据访问类
/// </summary>
public abstract class DbHelperSQL
{
    //数据库连接字符串(web.config来配置)   
    public static readonly string strConn =
        AppSettingsHelper.getValueByKey("ConnectionStrings");

    #region 公用方法

    /// <summary>
    ///     取到最大字段值
    /// </summary>
    /// <param name="FieldName"></param>
    /// <param name="TableName"></param>
    /// <returns></returns>
    public static int GetMaxID(string FieldName, string TableName)
    {
        var strsql = "select max(" + FieldName + ") from " + TableName;
        var obj = GetSingle(strsql);
        if (obj == null)
            return 0;
        return int.Parse(obj.ToString());
    }

    /// <summary>
    ///     是否存在某条记录
    /// </summary>
    /// <param name="strSql"></param>
    /// <param name="cmdParms"></param>
    /// <returns></returns>
    public static bool Exists(string strSql, params SqlParameter[] cmdParms)
    {
        var obj = GetSingle(strSql, cmdParms);
        int cmdresult;
        if (Equals(obj, null) || Equals(obj, DBNull.Value))
            cmdresult = 0;
        else
            cmdresult = int.Parse(obj.ToString());
        if (cmdresult == 0)
            return false;
        return true;
    }

    #endregion

    #region 执行简单SQL语句

    /// <summary>
    ///     执行SQL语句，返回影响的记录数
    /// </summary>
    /// <param name="SQLString">SQL语句</param>
    /// <returns>影响的记录数</returns>
    public static int ExecuteSql(string SQLString)
    {
        using (var connection = new SqlConnection(strConn))
        {
            using (var cmd = new SqlCommand(SQLString, connection))
            {
                try
                {
                    connection.Open();
                    var rows = cmd.ExecuteNonQuery();
                    return rows;
                }
                catch (SqlException E)
                {
                    connection.Close();
                    throw new Exception(E.Message);
                }
            }
        }
    }

    /// <summary>
    ///     执行多条SQL语句，实现数据库事务。
    /// </summary>
    /// <param name="SQLStringList">多条SQL语句</param>
    public static void ExecuteSqlTran(ArrayList SQLStringList)
    {
        using (var conn = new SqlConnection(strConn))
        {
            conn.Open();
            var cmd = new SqlCommand();
            cmd.Connection = conn;
            var tx = conn.BeginTransaction();
            cmd.Transaction = tx;
            try
            {
                for (var n = 0; n < SQLStringList.Count; n++)
                {
                    var strsql = SQLStringList[n].ToString();
                    if (strsql.Trim().Length > 1)
                    {
                        cmd.CommandText = strsql;
                        cmd.ExecuteNonQuery();
                    }
                }

                tx.Commit();
            }
            catch (SqlException E)
            {
                tx.Rollback();
                throw new Exception(E.Message);
            }
        }
    }

    /// <summary>
    ///     执行带一个存储过程参数的的SQL语句。
    /// </summary>
    /// <param name="SQLString">SQL语句</param>
    /// <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>
    /// <returns>影响的记录数</returns>
    public static int ExecuteSql(string SQLString, string content)
    {
        using (var connection = new SqlConnection(strConn))
        {
            var cmd = new SqlCommand(SQLString, connection);
            var myParameter = new SqlParameter("@content", SqlDbType.NText);
            myParameter.Value = content;
            cmd.Parameters.Add(myParameter);
            try
            {
                connection.Open();
                var rows = cmd.ExecuteNonQuery();
                return rows;
            }
            catch (SqlException E)
            {
                throw new Exception(E.Message);
            }
            finally
            {
                cmd.Dispose();
                connection.Close();
            }
        }
    }

    /// <summary>
    ///     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)
    /// </summary>
    /// <param name="strSQL">SQL语句</param>
    /// <param name="fs">图像字节,数据库的字段类型为image的情况</param>
    /// <returns>影响的记录数</returns>
    public static int ExecuteSqlInsertImg(string strSQL, byte[] fs)
    {
        using (var connection = new SqlConnection(strConn))
        {
            var cmd = new SqlCommand(strSQL, connection);
            var myParameter = new SqlParameter("@fs", SqlDbType.Image);
            myParameter.Value = fs;
            cmd.Parameters.Add(myParameter);
            try
            {
                connection.Open();
                var rows = cmd.ExecuteNonQuery();
                return rows;
            }
            catch (SqlException E)
            {
                throw new Exception(E.Message);
            }
            finally
            {
                cmd.Dispose();
                connection.Close();
            }
        }
    }

    /// <summary>
    ///     执行一条计算查询结果语句，返回查询结果（object）。
    /// </summary>
    /// <param name="SQLString">计算查询结果语句</param>
    /// <returns>查询结果（object）</returns>
    public static object GetSingle(string SQLString)
    {
        using (var connection = new SqlConnection(strConn))
        {
            using (var cmd = new SqlCommand(SQLString, connection))
            {
                try
                {
                    connection.Open();
                    var obj = cmd.ExecuteScalar();
                    if (Equals(obj, null) || Equals(obj, DBNull.Value))
                        return null;
                    return obj;
                }
                catch (SqlException e)
                {
                    connection.Close();
                    throw new Exception(e.Message);
                }
            }
        }
    }

    /// <summary>
    ///     执行查询语句，返回SqlDataReader
    /// </summary>
    /// <param name="strSQL">查询语句</param>
    /// <returns>SqlDataReader</returns>
    public static SqlDataReader ExecuteReader(string strSQL)
    {
        var connection = new SqlConnection(strConn);
        var cmd = new SqlCommand(strSQL, connection);
        try
        {
            connection.Open();
            var myReader = cmd.ExecuteReader();
            return myReader;
        }
        catch (SqlException e)
        {
            throw new Exception(e.Message);
        }
    }

    /// <summary>
    ///     执行查询语句，返回DataSet
    /// </summary>
    /// <param name="SQLString">查询语句</param>
    /// <returns>DataSet</returns>
    public static DataSet Query(string SQLString)
    {
        using (var connection = new SqlConnection(strConn))
        {
            var ds = new DataSet();
            try
            {
                connection.Open();
                var command = new SqlDataAdapter(SQLString, connection);
                command.Fill(ds, "ds");
            }
            catch (SqlException ex)
            {
                throw new Exception(ex.Message);
            }

            return ds;
        }
    }

    #endregion

    #region 执行带参数的SQL语句

    /// <summary>
    ///     执行SQL语句，返回影响的记录数
    /// </summary>
    /// <param name="SQLString">SQL语句</param>
    /// <returns>影响的记录数</returns>
    public static int ExecuteSql(string SQLString,
        params SqlParameter[] cmdParms)
    {
        using (var connection = new SqlConnection(strConn))
        {
            using (var cmd = new SqlCommand())
            {
                try
                {
                    PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                    var rows = cmd.ExecuteNonQuery();
                    cmd.Parameters.Clear();
                    return rows;
                }
                catch (SqlException E)
                {
                    throw new Exception(E.Message);
                }
            }
        }
    }

    /// <summary>
    ///     执行多条SQL语句，实现数据库事务。
    /// </summary>
    /// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的SqlParameter[]）</param>
    public static void ExecuteSqlTran(Hashtable SQLStringList)
    {
        using (var conn = new SqlConnection(strConn))
        {
            conn.Open();
            using (var trans = conn.BeginTransaction())
            {
                var cmd = new SqlCommand();
                try
                {
                    //循环   
                    foreach (DictionaryEntry myDE in SQLStringList)
                    {
                        var cmdText = myDE.Key.ToString();
                        var cmdParms = (SqlParameter[])myDE.Value;
                        PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
                        var val = cmd.ExecuteNonQuery();
                        cmd.Parameters.Clear();

                        //trans.Commit();
                    }

                    trans.Commit();
                }
                catch
                {
                    trans.Rollback();
                    throw;
                }
            }
        }
    }

    /// <summary>
    ///     执行多条SQL语句，实现数据库事务。
    /// </summary>
    /// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的SqlParameter[]）</param>
    public static int ExecuteSqlTranRtn(Hashtable SQLStringList)
    {
        var d = 0;
        using (var conn = new SqlConnection(strConn))
        {
            conn.Open();
            using (var trans = conn.BeginTransaction())
            {
                var cmd = new SqlCommand();
                try
                {
                    //循环   
                    foreach (DictionaryEntry myDE in SQLStringList)
                    {
                        var cmdText = myDE.Key.ToString();
                        var cmdParms = (SqlParameter[])myDE.Value;
                        PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
                        var val = cmd.ExecuteNonQuery();
                        d = d + val;
                        cmd.Parameters.Clear();

                        //trans.Commit();
                    }

                    trans.Commit();
                }
                catch
                {
                    trans.Rollback();
                    throw;
                }
            }
        }

        return d;
    }

    /// <summary>
    ///     执行多条SQL语句，实现数据库事务
    /// </summary>
    /// <param name="SQLStringList">SQL语句的哈希表（key为标识，value是该语句的SqlParameter[]）</param>
    public static void ExecuteSqlTran(string sqltxt, Hashtable SQLStringList)
    {
        using (var conn = new SqlConnection(strConn))
        {
            conn.Open();
            using (var trans = conn.BeginTransaction())
            {
                var cmd = new SqlCommand();
                try
                {
                    //循环   
                    foreach (DictionaryEntry myDE in SQLStringList)
                    {
                        var cmdText = sqltxt;
                        var cmdParms = (SqlParameter[])myDE.Value;
                        PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
                        var val = cmd.ExecuteNonQuery();
                        cmd.Parameters.Clear();
                    }

                    trans.Commit();
                }
                catch
                {
                    trans.Rollback();
                    throw;
                }
            }
        }
    }

    /// <summary>
    ///     执行一条计算查询结果语句，返回查询结果（object）。
    /// </summary>
    /// <param name="SQLString">计算查询结果语句</param>
    /// <returns>查询结果（object）</returns>
    public static object GetSingle(string SQLString,
        params SqlParameter[] cmdParms)
    {
        using (var connection = new SqlConnection(strConn))
        {
            using (var cmd = new SqlCommand())
            {
                try
                {
                    PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                    var obj = cmd.ExecuteScalar();
                    cmd.Parameters.Clear();
                    if (Equals(obj, null) || Equals(obj, DBNull.Value))
                        return null;
                    return obj;
                }
                catch (SqlException e)
                {
                    throw new Exception(e.Message);
                }
            }
        }
    }

    /// <summary>
    ///     执行查询语句，返回SqlDataReader
    /// </summary>
    /// <param name="strSQL">查询语句</param>
    /// <returns>SqlDataReader</returns>
    public static SqlDataReader ExecuteReader(string SQLString,
        params SqlParameter[] cmdParms)
    {
        var connection = new SqlConnection(strConn);
        var cmd = new SqlCommand();
        try
        {
            PrepareCommand(cmd, connection, null, SQLString, cmdParms);
            var myReader = cmd.ExecuteReader();
            cmd.Parameters.Clear();
            return myReader;
        }
        catch (SqlException e)
        {
            throw new Exception(e.Message);
        }
    }

    /// <summary>
    ///     执行查询语句，返回DataSet
    /// </summary>
    /// <param name="SQLString">查询语句</param>
    /// <returns>DataSet</returns>
    public static DataSet Query(string SQLString,
        params SqlParameter[] cmdParms)
    {
        using (var connection = new SqlConnection(strConn))
        {
            var cmd = new SqlCommand();
            PrepareCommand(cmd, connection, null, SQLString, cmdParms);
            using (var da = new SqlDataAdapter(cmd))
            {
                var ds = new DataSet();
                try
                {
                    da.Fill(ds, "ds");
                    cmd.Parameters.Clear();
                }
                catch (SqlException ex)
                {
                    throw new Exception(ex.Message);
                }

                return ds;
            }
        }
    }

    //private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, string cmdText, SqlParameter[] cmdParms)
    //{

    //    if (conn.State != ConnectionState.Open)
    //        conn.Open();
    //    cmd.Connection = conn;
    //    cmd.CommandText = cmdText;
    //    if (trans != null)
    //        cmd.Transaction = trans;
    //    cmd.CommandType = CommandType.Text;//cmdType;
    //    if (cmdParms != null)
    //    {
    //        foreach (SqlParameter parameter in cmdParms)
    //        {
    //            if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input) &&
    //                (parameter.Value == null))
    //            {
    //                parameter.Value = DBNull.Value;
    //            }
    //            cmd.Parameters.Add(parameter);
    //        }
    //    }
    //}
    private static void PrepareCommand(SqlCommand cmd, SqlConnection conn,
        SqlTransaction trans, string cmdText, SqlParameter[] cmdParms)
    {
        if (conn.State != ConnectionState.Open)
            conn.Open();
        cmd.Connection = conn;
        cmd.CommandText = cmdText;
        if (trans != null)
            cmd.Transaction = trans;
        cmd.CommandType = CommandType.Text; //cmdType;   
        if (cmdParms != null)
            foreach (var parm in cmdParms)
            {
                //cmd.Parameters.Add(parm);
                if ((parm.Direction == ParameterDirection.InputOutput ||
                     parm.Direction == ParameterDirection.Input) &&
                    parm.Value == null)
                    parm.Value = DBNull.Value;
                cmd.Parameters.Add(parm);
            }
    }

    #endregion

    #region 存储过程操作

    /// <summary>
    ///     执行存储过程
    /// </summary>
    /// <param name="storedProcName">存储过程名</param>
    /// <param name="parameters">存储过程参数</param>
    /// <returns>SqlDataReader</returns>
    public static SqlDataReader RunProcedure(string storedProcName,
        IDataParameter[] parameters)
    {
        var connection = new SqlConnection(strConn);
        SqlDataReader returnReader;
        connection.Open();
        var command = BuildQueryCommand(connection, storedProcName, parameters);
        command.CommandType = CommandType.StoredProcedure;
        returnReader = command.ExecuteReader();
        return returnReader;
    }

    /// <summary>
    ///     执行带输出参数的存储过程
    /// </summary>
    /// <param name="storedProcName">存储过程名</param>
    /// <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>
    /// <returns>string(以|分割的输出参数的值)</returns>
    public static string RunProcedureOut(string storedProcName,
        IDataParameter[] parameters, string outName)
    {
        var connection = new SqlConnection(strConn);
        var returnstring = string.Empty;
        connection.Open();
        var command = BuildQueryCommand(connection, storedProcName, parameters);
        command.CommandType = CommandType.StoredProcedure;
        command.ExecuteNonQuery();
        var str = string.Empty;
        //解析穿过来的参数   
        var Arraystr = outName.Split('|');
        foreach (var st in Arraystr)
        {
            var a = st;
            if (str == string.Empty)
                str = command.Parameters[a].Value.ToString();
            else
                str = str + "|" + command.Parameters[a].Value;
        }
        return str;
    }

    /// <summary>
    ///     执行存储过程
    /// </summary>
    /// <param name="storedProcName">存储过程名</param>
    /// <param name="parameters">存储过程参数</param>
    /// <param name="tableName">DataSet结果中的表名</param>
    /// <returns>DataSet</returns>
    public static DataSet RunProcedure(string storedProcName,
        IDataParameter[] parameters, string tableName)
    {
        using (var connection = new SqlConnection(strConn))
        {
            var dataSet = new DataSet();
            connection.Open();
            var sqlDA = new SqlDataAdapter();
            sqlDA.SelectCommand =
                BuildQueryCommand(connection, storedProcName, parameters);
            sqlDA.Fill(dataSet, tableName);
            connection.Close();
            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,
        string storedProcName, IDataParameter[] parameters)
    {
        var command = new SqlCommand(storedProcName, connection);
        command.CommandType = CommandType.StoredProcedure;
        foreach (SqlParameter parameter in parameters)
            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
}