C#——》Web Api 操作MySQL数据库公共类:MySql.Data

使用MySql.Data 连接mysql 数据库,需先引用MySql.Data ,用过MySql.Data.dll操作Mysql数据库。

1,在工具-Nuget包管理器-管理解决方案的Nuget程序包——安装MySql.data.dll

 

2,使用 MySqlConnection连接数据库,在使用MySqlCommand设置执行sql语句,执行类别,使用参数。

using System;
using System.Configuration;
using MySql.Data.MySqlClient;
using System.Data;
namespace Webapi.Data
{
public static class DBHelper
{
private static MySqlConnection con = null;

//获取配置文件中的数据库地址
private static string connection = ConfigurationManager.ConnectionStrings["smallprocedures"].ConnectionString;

/// <summary>
/// 开启/关闭数据库连接
/// </summary>
public static void Connection()
{

  try
  {
    if (con != null)
      con.Clone();
    else
    {
      con = new MySqlConnection(connection);
      con.Open();
    }
  }
  catch (Exception e)
  {
    //连接失败
  }
}
/// <summary>
/// 查询
/// </summary>
/// <param name="sql">sql语句</param>
/// <returns></returns>
public static DataSet Select(string sql)
{

  DataSet ds = new DataSet();
  try
  {
    Connection();//开启
    MySqlCommand com = new MySqlCommand(sql, con);
    com.CommandType = CommandType.Text;//执行sql语句
    MySqlDataAdapter db = new MySqlDataAdapter(com);
    db.Fill(ds);//读取数据
  }
  catch (Exception e)
  {

  }
  finally
  {
    Connection();//关闭
  }
  return ds;
}
/// <summary>
/// 查询(存储过程)
/// </summary>
/// <param name="procedureName">存储过程名称</param>
/// <param name="sqlParameter">参数</param>
/// <returns></returns>
public static DataSet Select_Procedure(string procedureName, MySqlParameter [] sqlParameter)
{
  DataSet ds = new DataSet();
  Connection();
  MySqlCommand com = new MySqlCommand(procedureName, con);
  com.CommandType = CommandType.StoredProcedure;//执行存储过程
  try
  {
    if (sqlParameter != null)
    {
      for (int i = 0; i < sqlParameter.Length; i++)
      com.Parameters.Add(sqlParameter[i]);
    }
    using (MySqlDataAdapter db = new MySqlDataAdapter(com))
    db.Fill(ds);
  }
  catch (Exception e)
  {
    com.Parameters.Clear();
  }
  finally
  {
    Connection();
  }
  return ds;
}
/// <summary>
/// 增删改
/// </summary>
/// <param name="sql">sql语句</param>
/// <returns></returns>
public static bool Update(string sql)
{
  Connection();
  int num = 0;
  MySqlCommand com = new MySqlCommand(sql, con);
  MySqlTransaction sqlTransaction = com.Transaction;//创建事务
  try
  {
    num= com.ExecuteNonQuery();

  }
  catch (Exception)
  {

    //异常处理
  }
  finally
  {
    if (num > 0)
      sqlTransaction.Commit();//提交
    else
      sqlTransaction.Rollback();//回滚

    Connection();

  }
  return false;
}
}
}

 

posted @ 2019-11-12 17:27  林子哈  阅读(1529)  评论(0编辑  收藏  举报