有时,为了提高数据库的性能,我们采用批量删除,就是一条sql删除1000条这样的数据,相比执行1000条sql的删除命令,性能会大大提高。
这里举个例子说明sql如何写
DBMysql dBMysql = new DBMysql();
dBMysql.ConnectDB("10.10.13.140", 3306, "root", "sa", "testdb");
string strSql = "delete from recordpiece where id in (1,2,3,4,5,6)"; //
DataSet dt = new DataSet();
if (!dBMysql.SqlExe(strSql, ref dt))
{
Console.WriteLine("SupplyFreeBlock m_bFileFull = false error sql ={0}", strSql);
return;
}
再来一个批量删除的例子:
DBMysql dBMysql = new DBMysql();
dBMysql.ConnectDB("10.10.13.140", 3306, "root", "sa", "testdb");
string strSql = "update recordpiece set status =8 where id in (7,8,9)"; //
DataSet dt = new DataSet();
if (!dBMysql.SqlExe(strSql, ref dt))
{
Console.WriteLine("SupplyFreeBlock m_bFileFull = false error sql ={0}", strSql);
return;
}