SET @sql = (SELECT IF( (SELECT COUNT(*) FROM usher_network_log ) > 1000000, "SELECT 0", "select * from Configuration")); PREPARE stmt FROM @sql;EXECUTE stmt;DEALLOCATE PREPARE stmt;…

转自:http://www.sqlusa.com/bestpractices/training/scripts/dynamicsql/ Dynamic SQL & Stored Procedure Usage in T-SQL Important security article related to dynamic SQL: How To: Protect From SQL Injection in ASP.NET ------------ -- Dynamic SQL QUICK SYNTA…

1. background in most cases, we want to execute sql script  in doris  routinely. using azkaban, to load data,etc.And we want to pass parameters to the sql script file. we can easily handle such situation in hive. 1.1 hive usage: using -hiveconf:  or…

The idea of using dynamic SQL is to execute SQL that will potentially generate and execute another SQL statement. While querying data, you might want to dynamically set columns you would like to query. On the other hand, you might want to parametrize…

Although MyBatis was designed to execute the query after it builds it, you can make use of it's configuration and a little bit of "inside knowledge" to get to what you need. MyBatis is a very nice framework, unfortunately it lacks on the documen…

原文链接:http://www.toadworld.com/products/toad-for-oracle/b/weblog/archive/2013/08/21/using-notepad-to-execute-oracle-sql.aspx Notepad++是一个很实用的文本编辑工具,用它来执行Oracle SQL也很有意思,虽然不太实用,或许在某些场合会有用吧. 在此复制原文只作记录,原文见如上链接. 原文如下: Toad for Oracle is the single most r…

问题 在工作中偶尔会遇到这样的问题:SQL script重复执行时会报错. 理想的状态下,SQL script跑一遍就够了,是不会重复执行的,但是实际情况往往很复杂. 比如Dev同学在开发时在A环境把他写的那个脚本单独执行了一遍,而在下一个测试周期的时候,测试同学又在A环境把所有DB脚本都执行了一遍,然后就报错了. 如下示例,这里错误的原因在于重复创建表. 例1 create table tableA (col1 char(10), col2 number); SQL Error: ORA-00…

In this Document   Goal   Solution   1: How do you enable trace for an API when executed from a SQL script outside of Oracle Applications ?   2: How do you get debug log for an API when executed from a SQL script outside of Oracle Applications ?   a)…

-- MyISAM Foreign Keys显示不了外键,MyISAM此为5.0 以下版本使用 InnoDB 为5.0以上版本使用 drop table IF EXISTS city; CREATE TABLE `city` ( `ID` int(11) NOT NULL AUTO_INCREMENT comment'', `Name` char(35) NOT NULL DEFAULT '' comment'', `CountryCode` char(3) NOT NULL DEFAULT '…

在做项目的时候需要些分页,用的数据库是MySQL,之前看到的参考例子是用MS SQL做的,在MS SQL.Oracle里面有ROW_NUMBER() OVER函数可以在数据库里对数据进行分组.百度后的结论总结如下: (一)先说下在mysql里面分页时的sql语句,转载自http://topic.csdn.net/u/20090504/15/bfbc217b-4ae4-4f36-9810-21de077fb034.html第13.14楼: MySQL中的分页比较容易,只要在程序中中得到是从哪条记录…