Dapper ，sqlserver数据库的简单封装类 Dbhelp.cs

写在前面：刚学Dapper的小白 欢迎各位同行指正！！！

Dbhelp类

class Dbhelp
{
//全局变量
DynamicParameters Dynparam = new DynamicParameters(); //sql语句中的where条件
log4net.ILog logInfo = log4net.LogManager.GetLogger("loginfo");

//数据库连接语句
public string ConnectionString
{
get { return ConfigurationManager.ConnectionStrings["SqlServerConnString"].ConnectionString; }
}

//数据库连接对象
public IDbConnection Db
{
get { return new SqlConnection(ConnectionString); }
}

//设置参数
public void setParam<T>(string param, T value)
{
Dynparam.Add(param, value);
}

//重写查询语句
//querystr 查询语句
public List<T> query<T>(string querystr)
{
List<T> result = null;
try
{
result = (List<T>)Db.Query<T>(querystr, Dynparam);
dispose();
}
catch (Exception ex)
{
logInfo.Info(ex.ToString());
}

return result;
}
//执行插入、修改、删除语句,返回受影响的行数
public int execute(string sql)
{
int row = 0;
try
{
row = Db.Execute(sql, Dynparam);
dispose();
}
catch (Exception ex)
{
logInfo.Info(ex.ToString());
}

return row;
}

//释放动态参数
public void dispose()
{
Dynparam = new DynamicParameters();
}
}

　　

//app.config 连接配置

<connectionStrings>
<add name="SqlServerConnString" providerName="System.Data.SqlClient" connectionString="server=服务器名称;database=数据库名称;User ID=用户名;Password=密码!"/>
</connectionStrings>

//如何调用

1、查询

   string str2 = string.Format("select stuname from student where stuname like @stuname");
            dbhelp.setParam("stuname", "李敏希");//全查询
            dbhelp.setParam("stuname", "%唐%");//模糊查询
            List<student> lststudent2 = dbhelp.query<student>(str2);
            foreach (var item in lststudent2)
            {
                Console.WriteLine(item.StuName + "
");
            }

2、修改

            string updateSql = string.Format(" update student set StuName =@StuName  where StuID = '20130523070'");
            dbhelp.setParam("StuName", "吴A5");
            int row = dbhelp.execute(updateSql);
            Console.WriteLine(row);
            Console.ReadKey();

3、删除

  //删除--单条件
            string deleteSql = string.Format(" delete from  student where StuID = '20130523070'");
            int row2 = dbhelp.execute(deleteSql);
            Console.WriteLine(row2);
            Console.ReadKey();
            //删除--多条件
            string deleteSql2 = string.Format("delete from student where StuID in @StuId");
            dbhelp.setParam("StuId", new string[] { "20130523071", "20130523072" });
            int row21 = dbhelp.execute(deleteSql2);
            Console.WriteLine(row21);
            Console.ReadKey();

4、插入

string insertstr = string.Format("insert into  student (StuID,StuName,StuSex,StuAge,StuBirth,StuCardID,IsDelete) values" +
            " (@StuID,@StuName,@StuSex,@StuAge,@StuBirth,@StuCardID,@IsDelete)");
            dbhelp.setParam("StuID", "20200925");
            dbhelp.setParam("StuName", "测试小三");
            dbhelp.setParam("StuSex", 2);
            dbhelp.setParam("StuAge", 18);
            dbhelp.setParam("StuBirth", "1997-09-15");
            dbhelp.setParam("StuCardID", 200000000);
            dbhelp.setParam("IsDelete", 1);
            int row3 = dbhelp.execute(insertstr);
            Console.WriteLine(row3);
            Console.ReadKey();