oracle的执行计划SQL> EXPLAIN PLAN FOR SELECT * FROM emp;已解释.SQL> SELECT plan_table_output FROM TABLE(DBMS_XPLAN.DISPLAY('PLAN_TABLE'));或者:SQL> select * from table(dbms_xplan.display); select distinct * from student; --排除重复对象 select * from(select e.*,r
1.定义EF拦截器,截获执行命令前的操作.修改执行sql.还需要定义orcal序列,供自增使用 using System; using System.Collections.Generic; using System.Data.Common; using System.Data.Entity.Infrastructure.Interception; using System.Linq; using System.Text; using System.Text.RegularExpressions