using MySql.Data.MySqlClient;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Data.OleDb;
using System.Data.SqlClient;
using System.Linq;

namespace BaseLibDataProcess
{
    public class ClsSQLServer
    {
        private string SqlConnectionString;    //数据库连接

        /// <summary>
        /// 构造函数
        /// 初始化连接数据库参数
        /// </summary>
        public ClsSQLServer(string DataName, string User, string PWD)
        {
            SqlConnectionString = @"Data Source=.\SQLEXPRESS;Initial Catalog=" + DataName + "; User ID=sa;pwd=sa";
        }

        /// <summary>
        /// 构造函数
        /// 初始化连接数据库参数
        /// </summary>
        /// <param name="ConSqlServer">连接对象</param>
        public ClsSQLServer(string ConSqlServer)
        {
            SqlConnectionString = ConSqlServer;
        }

        /// <summary>
        /// 打开数据库连接
        /// </summary>
        /// <param name="cn">连接</param>
        public void Open(SqlConnection cn)
        {
            if (cn.State == ConnectionState.Closed)
            {
                cn.Open();
            }
        }

        /// <summary>
        /// 关闭数据库连接
        /// </summary>
        /// <param name="cn">连接</param>
        public void Close(SqlConnection cn)
        {
            if (cn != null)
            {
                if (cn.State == ConnectionState.Open)
                {
                    cn.Close();
                }
                cn.Dispose();
            }
        }

        /// <summary>
        /// 查询
        /// </summary>
        /// <param name="strSql">SQL语句</param>
        /// <returns>是否存在</returns>
        public int operateSql(string str_sql)
        {
            //string sql = "insert into user(username,password,registerdate) values('啊宽','123','" + DateTime.Now + "')";
            //string sql = "delete from user where userid='9'";
            //string sql = "update user set username='啊哈',password='123' where userid='8'";

            int result = 0;
            SqlConnection sqlCon = new SqlConnection(SqlConnectionString);
            using (SqlCommand cmd = new SqlCommand(str_sql, sqlCon))
            {
                try
                {
                    // MySqlCommand cmd = new MySqlCommand(str_sql, conn);
                    result = cmd.ExecuteNonQuery();//3.执行插入、删除、更改语句。执行成功返回受影响的数据的行数，返回1可做true判断。执行失败不返回任何数据，报错，下面代码都不执行
                }
                catch (SqlException ex)
                {
                    Console.WriteLine(ex.Message);
                }
                finally
                {
                    sqlCon.Close();
                }
            }
            return result;
        }

    }

}