355 lines
14 KiB
C#
355 lines
14 KiB
C#
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using MySql.Data.MySqlClient;
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using System;
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using System.Collections.Generic;
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using System.Data;
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using System.Linq;
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using System.Text;
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using System.Text.RegularExpressions;
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using System.Threading.Tasks;
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namespace TestWebSocket
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{
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public class MysqlHelpers
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{
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public static readonly string connectionString = "Server=blv-cloud-db.mysql.rds.aliyuncs.com;Database=face;Uid=blv_rcu;Pwd=fnadiaJDIJ7546;charset=utf8;port=3307;";
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public MysqlHelpers() { }
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#region ExecuteNonQuery
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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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/// 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 ExecuteNonQuery(string SQLString)
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{
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using (MySqlConnection connection = new MySqlConnection(connectionString))
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{
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using (MySqlCommand cmd = new MySqlCommand(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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int rows = cmd.ExecuteNonQuery();
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return rows;
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}
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catch (MySql.Data.MySqlClient.MySqlException e)
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{
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connection.Close();
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throw e;
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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 ExecuteNonQuery(string SQLString, params MySqlParameter[] cmdParms)
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{
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using (MySqlConnection connection = new MySqlConnection(connectionString))
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{
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using (MySqlCommand cmd = new MySqlCommand())
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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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int 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 (MySql.Data.MySqlClient.MySqlException e)
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{
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throw e;
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}
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}
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}
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}
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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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/// 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 bool ExecuteNoQueryTran(List<String> SQLStringList)
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{
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using (MySqlConnection conn = new MySqlConnection(connectionString))
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{
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conn.Open();
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MySqlCommand cmd = new MySqlCommand();
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cmd.Connection = conn;
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MySqlTransaction tx = conn.BeginTransaction();
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cmd.Transaction = tx;
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try
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{
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for (int n = 0; n < SQLStringList.Count; n++)
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{
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string strsql = SQLStringList[n];
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if (strsql.Trim().Length > 1)
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{
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cmd.CommandText = strsql;
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PrepareCommand(cmd, conn, tx, strsql, null);
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cmd.ExecuteNonQuery();
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}
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}
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cmd.ExecuteNonQuery();
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tx.Commit();
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return true;
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}
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catch
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{
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tx.Rollback();
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return false;
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}
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}
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}
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#endregion
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#region ExecuteScalar
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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 ExecuteScalar(string SQLString)
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{
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using (MySqlConnection connection = new MySqlConnection(connectionString))
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{
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using (MySqlCommand cmd = new MySqlCommand(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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object obj = cmd.ExecuteScalar();
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if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
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{
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return null;
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}
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else
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{
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return obj;
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}
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}
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catch (MySql.Data.MySqlClient.MySqlException e)
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{
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connection.Close();
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throw e;
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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 ExecuteScalar(string SQLString, params MySqlParameter[] cmdParms)
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{
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using (MySqlConnection connection = new MySqlConnection(connectionString))
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{
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using (MySqlCommand cmd = new MySqlCommand())
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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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object obj = cmd.ExecuteScalar();
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cmd.Parameters.Clear();
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if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
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{
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return null;
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}
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else
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{
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return obj;
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}
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}
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catch (MySql.Data.MySqlClient.MySqlException e)
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{
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throw e;
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}
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}
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}
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}
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#endregion
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#region ExecuteReader
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/// <summary>
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/// 执行查询语句，返回MySqlDataReader ( 注意：调用该方法后，一定要对MySqlDataReader进行Close )
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/// </summary>
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/// <param name="strSQL">查询语句</param>
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/// <returns>MySqlDataReader</returns>
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public static MySqlDataReader ExecuteReader(string strSQL)
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{
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MySqlConnection connection = new MySqlConnection(connectionString);
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MySqlCommand cmd = new MySqlCommand(strSQL, connection);
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try
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{
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connection.Open();
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MySqlDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
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return myReader;
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}
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catch (MySql.Data.MySqlClient.MySqlException e)
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{
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throw e;
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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MySqlDataReader ( 注意：调用该方法后，一定要对MySqlDataReader进行Close )
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/// </summary>
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/// <param name="strSQL">查询语句</param>
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/// <returns>MySqlDataReader</returns>
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public static MySqlDataReader ExecuteReader(string SQLString, params MySqlParameter[] cmdParms)
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{
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MySqlConnection connection = new MySqlConnection(connectionString);
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MySqlCommand cmd = new MySqlCommand();
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try
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{
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PrepareCommand(cmd, connection, null, SQLString, cmdParms);
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MySqlDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
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cmd.Parameters.Clear();
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return myReader;
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}
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catch (MySql.Data.MySqlClient.MySqlException e)
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{
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throw e;
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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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#endregion
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#region ExecuteDataTable
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/// <summary>
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/// 执行查询语句，返回DataTable
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/// </summary>
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/// <param name="SQLString">查询语句</param>
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/// <returns>DataTable</returns>
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public static DataTable ExecuteDataTable(string SQLString)
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{
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using (MySqlConnection connection = new MySqlConnection(connectionString))
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{
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DataSet ds = new DataSet();
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try
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{
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connection.Open();
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MySqlDataAdapter command = new MySqlDataAdapter(SQLString, connection);
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command.Fill(ds, "ds");
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}
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catch (MySql.Data.MySqlClient.MySqlException ex)
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{
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throw new Exception(ex.Message);
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}
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return ds.Tables[0];
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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>DataTable</returns>
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public static DataTable ExecuteDataTable(string SQLString, params MySqlParameter[] cmdParms)
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{
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using (MySqlConnection connection = new MySqlConnection(connectionString))
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{
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MySqlCommand cmd = new MySqlCommand();
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PrepareCommand(cmd, connection, null, SQLString, cmdParms);
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using (MySqlDataAdapter da = new MySqlDataAdapter(cmd))
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{
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DataSet 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 (MySql.Data.MySqlClient.MySqlException ex)
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{
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throw new Exception(ex.Message);
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}
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return ds.Tables[0];
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}
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}
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}
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//获取起始页码和结束页码
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public static DataTable ExecuteDataTable(string cmdText, int startResord, int maxRecord)
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{
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using (MySqlConnection connection = new MySqlConnection(connectionString))
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{
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DataSet ds = new DataSet();
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try
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{
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connection.Open();
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MySqlDataAdapter command = new MySqlDataAdapter(cmdText, connection);
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command.Fill(ds, startResord, maxRecord, "ds");
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}
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catch (MySql.Data.MySqlClient.MySqlException ex)
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{
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throw new Exception(ex.Message);
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}
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return ds.Tables[0];
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}
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}
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#endregion
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/// <summary>
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/// 获取分页数据 在不用存储过程情况下
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/// </summary>
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/// <param name="recordCount">总记录条数</param>
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/// <param name="selectList">选择的列逗号隔开,支持top num</param>
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/// <param name="tableName">表名字</param>
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/// <param name="whereStr">条件字符 必须前加 and</param>
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/// <param name="orderExpression">排序 例如 ID</param>
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/// <param name="pageIdex">当前索引页</param>
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/// <param name="pageSize">每页记录数</param>
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/// <returns></returns>
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public static DataTable getPager(out int recordCount, string selectList, string tableName, string whereStr, string orderExpression, int pageIdex, int pageSize)
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{
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int rows = 0;
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DataTable dt = new DataTable();
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MatchCollection matchs = Regex.Matches(selectList, @"top\s+\d{1,}", RegexOptions.IgnoreCase);//含有top
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string sqlStr = sqlStr = string.Format("select {0} from {1} where 1=1 {2}", selectList, tableName, whereStr);
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if (!string.IsNullOrEmpty(orderExpression)) { sqlStr += string.Format(" Order by {0}", orderExpression); }
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if (matchs.Count > 0) //含有top的时候
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{
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DataTable dtTemp = ExecuteDataTable(sqlStr);
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rows = dtTemp.Rows.Count;
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}
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else //不含有top的时候
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{
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string sqlCount = string.Format("select count(*) from {0} where 1=1 {1} ", tableName, whereStr);
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//获取行数
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object obj = ExecuteScalar(sqlCount);
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if (obj != null)
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{
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rows = Convert.ToInt32(obj);
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}
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}
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dt = ExecuteDataTable(sqlStr, (pageIdex - 1) * pageSize, pageSize);
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recordCount = rows;
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return dt;
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}
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#region 创建command
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private static void PrepareCommand(MySqlCommand cmd, MySqlConnection conn, MySqlTransaction trans, string cmdText, MySqlParameter[] 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 (MySqlParameter 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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#endregion
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}
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}
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