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using BaseFun;
using MySql.Data.MySqlClient;
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
namespace MySQLHelper
{
public static class MySQLHelper
{
public static string connectionString { get; set; }
public static MySqlConnection conn()
{
try
{
if (connectionString == null)
{
connectionString = appSittingSet.readAppsettings("MySqlConnect").Split('|')[0];
}
MySqlConnection connection = new MySqlConnection(connectionString);
if (connection.State == ConnectionState.Closed)
{
connection.Open();
}
return connection;
}
catch (MySqlException ex)
{
appSittingSet.Log(ex.Message+ex.ToString());
throw;
}
}
/// <summary>
/// 判断链接状态
/// </summary>
/// <returns></returns>
public static bool IsOpen()
{
return conn().State == ConnectionState.Open;
}
/// <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)
{
MySqlConnection connection = conn();
DataSet ds = new DataSet();
try
{
MySqlDataAdapter command = new MySqlDataAdapter(SQLString, connection);
command.Fill(ds);
}
catch (SqlException ex)
{
//throw new Exception(ex.Message);
appSittingSet.Log(ex.Message + ex.ToString());
}
finally
{
connection.Close();
}
return ds;
}
/// <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)
{
return ExecuteSql(SQLString, null);
}
public static int ExecuteSql(string SQLString, List<MySqlParameter> para)
{
MySqlConnection connection = conn();
using (MySqlCommand cmd = new MySqlCommand(SQLString, connection))
{
try
{
if (para != null && para.Count > 0)
{
cmd.Parameters.AddRange(para.ToArray());
}
int rows = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
return rows;
}
catch (SqlException ex)
{
connection.Close();
appSittingSet.Log(ex.Message + ex.ToString());
throw;
}
finally
{
cmd.Dispose();
connection.Close();
}
}
}
//执行多条SQL语句，实现数据库事务。
/// <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 bool ExecuteNoQueryTran(List<String> SQLStringList)
{
MySqlConnection connection = conn();
MySqlCommand cmd = new MySqlCommand();
MySqlTransaction tx = connection.BeginTransaction();
cmd.Connection = connection;
cmd.Transaction = tx;
try
{
foreach (var item in SQLStringList)
{
cmd.CommandText = item;
cmd.ExecuteNonQuery();
}
tx.Commit();
return true;
}
catch(Exception ex)
{
tx.Rollback();
appSittingSet.Log(ex.Message + ex.ToString());
throw;
}
}
/// <summary>
/// 执行SQL语句数组，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[] arrSql)
{
MySqlConnection connection = conn();
try
{
//MySqlCommand cmdEncoding = new MySqlCommand(SET_ENCODING, connection);
//cmdEncoding.ExecuteNonQuery();
int rows = 0;
foreach (string strN in arrSql)
{
using (MySqlCommand cmd = new MySqlCommand(strN, connection))
{
rows += cmd.ExecuteNonQuery();
}
}
return rows;
}
catch (SqlException ex)
{
connection.Close();
appSittingSet.Log(ex.Message + ex.ToString());
throw;
}
finally
{
connection.Close();
}
}
/// <summary>
/// 是否存在记录
/// </summary>
/// <param name="SQLString"></param>
/// <returns></returns>
public static bool Exsist(string SQLString)
{
MySqlConnection connection = conn();
using (MySqlCommand cmd = new MySqlCommand(SQLString, connection))
{
try
{
MySqlDataReader sdr = cmd.ExecuteReader();
return sdr.HasRows;
}
catch (SqlException ex)
{
connection.Close();
appSittingSet.Log(ex.Message + ex.ToString());
throw;
}
finally
{
cmd.Dispose();
connection.Close();
}
}
}
/// <summary>
/// 获取符合条件的记录行数
/// </summary>
/// <param name="SQLString"></param>
/// <returns></returns>
public static int GetCount(string SQLString)
{
//object o = GetScalar(SQLString);
//return o == null ? 0 : (int)o;
MySqlConnection connection = conn();
using (MySqlCommand cmd = new MySqlCommand(SQLString, connection))
{
try
{
int i = 0;
MySqlDataReader sdr = cmd.ExecuteReader();
while (sdr.Read())
{
i++;
}
sdr.Close();
return i;
}
catch (SqlException ex)
{
connection.Close();
appSittingSet.Log(ex.Message + ex.ToString());
throw;
}
finally
{
cmd.Dispose();
connection.Close();
}
}
}
/// <summary>
/// 获取符合条件的首行首列
/// </summary>
/// <param name="SQLString"></param>
/// <returns></returns>
public static object GetScalar(string SQLString)
{
try
{
MySqlConnection connection = conn();
using (MySqlCommand cmd = new MySqlCommand(SQLString, connection))
{
object o = cmd.ExecuteScalar();
return o;
}
}
catch (SqlException ex)
{
appSittingSet.Log(ex.Message + ex.ToString());
return null;
}
}
public static T GetScalar<T>(string SQLString)
{
object o = GetScalar(SQLString);
return o != null ? (T)Convert.ChangeType(o, typeof(T)) : default(T);
}
}
}