using System;
using System.Collections.Generic;
using System.Configuration;
using MySql.Data.MySqlClient;
using System.Data;
namespace Utils
{
/// <summary>
/// MySQL数据库工具类
/// </summary>
public abstract class MySQLUtil
{
/// <summary>
/// 数据库连接字符串
/// </summary>
public static readonly string ConnStr = ConfigurationManager.ConnectionStrings["DefaultConnection"].ConnectionString;
/// <summary>
/// 执行语句并返回影响的行数
/// </summary>
/// <param name="connStr">数据库连接字符串</param>
/// <param name="cmdType">命令类型</param>
/// <param name="cmdText">命令字符串</param>
/// <param name="parameters">参数集</param>
/// <returns>影响的行数</returns>
public static int ExecuteNonQuery(string connStr, CommandType cmdType, string cmdText, params MySqlParameter[] parameters)
{
using (var conn = new MySqlConnection(connStr))
{
return ExecuteNonQuery(conn, cmdType, cmdText, parameters);
}
}
/// <summary>
/// 执行语句并返回影响的行数
/// </summary>
/// <param name="conn">数据库连接</param>
/// <param name="cmdType">命令类型</param>
/// <param name="cmdText">命令字符串</param>
/// <param name="parameters">参数集</param>
/// <returns>影响的行数</returns>
public static int ExecuteNonQuery(MySqlConnection conn, CommandType cmdType, string cmdText, params MySqlParameter[] parameters)
{
using (var cmd = new MySqlCommand())
{
PrepareCommand(cmd, conn, null, cmdType, cmdText, parameters);
var val = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
return val;
}
}
/// <summary>
/// 执行语句并返回影响的行数
/// </summary>
/// <param name="trans">事务</param>
/// <param name="cmdType">命令类型</param>
/// <param name="cmdText">命令字符串</param>
/// <param name="parameters">参数集</param>
/// <returns>影响的行数</returns>
public static int ExecuteNonQuery(MySqlTransaction trans, CommandType cmdType, string cmdText, params MySqlParameter[] parameters)
{
using (var cmd = new MySqlCommand())
{
PrepareCommand(cmd, trans.Connection, trans, cmdType, cmdText, parameters);
var val = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
return val;
}
}
/// <summary>
/// 执行语句并返回DataReader对象
/// </summary>
/// <param name="connStr">数据库连接字符串</param>
/// <param name="cmdType">命令类型</param>
/// <param name="cmdText">命令字符串</param>
/// <param name="parameters">参数集</param>
/// <returns>执行语句并返回DataReader对象</returns>
/// <remarks>P.S：DataReader使用后要手动释放</remarks>
public static MySqlDataReader ExecuteReader(string connStr, CommandType cmdType, string cmdText, params MySqlParameter[] parameters)
{
var cmd = new MySqlCommand();
var conn = new MySqlConnection(connStr);
try
{
PrepareCommand(cmd, conn, null, cmdType, cmdText, parameters);
var dr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
cmd.Parameters.Clear();
return dr;
}
catch
{
conn.Close();
throw;
}
}
/// <summary>
/// 执行语句并返回DataSet对象
/// </summary>
/// <param name="cmdText"></param>
/// <param name="parameters"></param>
/// <returns></returns>
public static DataSet ExecuteDataSet(string cmdText, params MySqlParameter[] parameters)
{
return ExecuteDataSet(ConnStr, CommandType.Text, cmdText, parameters);
}
/// <summary>
/// 执行语句并返回DataSet对象
/// </summary>
/// <param name="connStr">数据库连接字符串</param>
/// <param name="cmdType">命令类型</param>
/// <param name="cmdText">命令字符串</param>
/// <param name="parameters">参数集</param>
/// <returns>执行语句并返回DataSet对象</returns>
/// <returns></returns>
public static DataSet ExecuteDataSet(string connStr, CommandType cmdType, string cmdText, params MySqlParameter[] parameters)
{
using (var conn = new MySqlConnection(connStr))
{
return ExecuteDataSet(conn, cmdType, cmdText, parameters);
}
}
/// <summary>
/// 执行语句并返回DataSet对象
/// </summary>
/// <param name="connStr">数据库连接字符串</param>
/// <param name="cmdType">命令类型</param>
/// <param name="cmdText">命令字符串</param>
/// <param name="parameters">参数集</param>
/// <returns>执行语句并返回DataSet对象</returns>
/// <returns></returns>
public static DataSet ExecuteDataSet(MySqlConnection conn, CommandType cmdType, string cmdText, params MySqlParameter[] parameters)
{
using (var cmd = new MySqlCommand())
{
PrepareCommand(cmd, conn, null, cmdType, cmdText, parameters);
using (var da = new MySqlDataAdapter(cmd))
{
var ds = new DataSet();
try
{
da.Fill(ds, "ds");
cmd.Parameters.Clear();
}
catch (MySqlException ex)
{
throw new Exception(ex.Message);
}
return ds;
}
}
}
/// <summary>
/// 执行语句并返回一个对象
/// </summary>
/// <param name="cmdText">命令字符串</param>
/// <param name="parameters">参数集</param>
/// <returns>返回一个object对象，对象中只包含一列。</returns>
public static object ExecuteScalar(string cmdText, params MySqlParameter[] parameters)
{
return ExecuteScalar(ConnStr, CommandType.Text, cmdText, parameters);
}
/// <summary>
/// 执行语句并返回一个对象
/// </summary>
/// <param name="connStr">数据库连接字符串</param>
/// <param name="cmdType">命令类型</param>
/// <param name="cmdText">命令字符串</param>
/// <param name="parameters">参数集</param>
/// <returns>返回一个object对象，对象中只包含一列。</returns>
public static object ExecuteScalar(string connStr, CommandType cmdType, string cmdText, params MySqlParameter[] parameters)
{
using (var conn = new MySqlConnection(connStr))
{
return ExecuteScalar(conn, cmdType, cmdText, parameters);
}
}
/// <summary>
/// 执行语句并返回一个对象
/// </summary>
/// <param name="conn">数据库连接</param>
/// <param name="cmdType">命令类型</param>
/// <param name="cmdText">命令字符串</param>
/// <param name="parameters">参数集</param>
/// <returns>返回一个object对象，对象中只包含一列。</returns>
public static object ExecuteScalar(MySqlConnection conn, CommandType cmdType, string cmdText, params MySqlParameter[] parameters)
{
using (var cmd = new MySqlCommand())
{
PrepareCommand(cmd, conn, null, cmdType, cmdText, parameters);
var val = cmd.ExecuteScalar();
cmd.Parameters.Clear();
return val;
}
}
/// <summary>
/// 为执行准备命令对象
/// </summary>
/// <param name="cmd">command 对象</param>
/// <param name="conn">连接对象</param>
/// <param name="trans">事务对象</param>
/// <param name="cmdType">命令类型</param>
/// <param name="cmdText">命令字符串</param>
/// <param name="cmdParms">参数集</param>
private static void PrepareCommand(MySqlCommand cmd, MySqlConnection conn, MySqlTransaction trans, CommandType cmdType, string cmdText, IEnumerable<MySqlParameter> parameters)
{
if (conn.State != ConnectionState.Open)
conn.Open();
cmd.Connection = conn;
cmd.CommandText = cmdText;
if (trans != null)
cmd.Transaction = trans;
cmd.CommandType = cmdType;
if (parameters == null) return;
foreach (var parm in parameters)
cmd.Parameters.Add(parm);
}
}
}