sql工作记录

SHOW INDEX FROM AdvDoc;                显示这张表中的所有索引

CREATE INDEX IDX01_AdvDoc ON AdvDoc(F_OrderID);            添加这张表的索引

CREATE INDEX IDX01_AdvDoc ON AdvDoc(F_OrderID, F_Size_ID, F_Color_ID, F_Width, F_Height, F_Content);

SHOW INDEX FROM AdvDoc;                    显示所有索引

DROP INDEX IDX01_AdvDoc ON AdvDoc;            删除索引，根据索引名称

alter table advitem ADD PRIMARY KEY (
`SYS_DOCUMENTID`  ASC
)                                                                                        添加主键约束，升序
alter table advitem drop primary key                删除主键约束

alter table advitem ADD PRIMARY KEY (
`SYS_DOCUMENTID`  ASC
);

DELETE FROM AdvColor;            删除表中的所有行；

SELECT table_name, table_type, engine
FROM information_schema.tables
WHERE table_schema = 'test'
ORDER BY table_name DESC;

mysql判断表是否存在：
if (select table_name from `INFORMATION_SCHEMA`.`TABLES` where table_name ='AdvssItem' and TABLE_SCHEMA='oms') = NULL

mysql function中不能用select

show variables like 'version'        查看版本

SELECT NAME FROM mysql.proc WHERE db = 'oms'

SHOW CREATE PROCEDURE  usp_CopyTemplatePage                查看存储过程
有定义declare就要有begin end

while 的用法：
while do
end while

if:
if then;
else

end if

while 例子：
DROP PROCEDURE if EXISTS test_while;
CREATE PROCEDURE test_while(in in_count INT)
BEGIN
DECLARE count int DEFAULT 0;
WHILE count<10    do
set count = count +1;
end WHILE;
SELECT count;
END

return的例子：

DROP PROCEDURE IF EXISTS `sp_test_return`;

CREATE PROCEDURE `sp_test_return`(In num integer)
label_pro:
begin
DECLARE aa INT;
if num > 3 then
leave label_pro;
else
select num as exeuted;
end if;
end;

临时表实例

CREATE PROCEDURE sp_test_tt(IN i_chars VARCHAR(50),OUT o_counts BIGINT)
BEGIN
create temporary table if not exists tmpTable
(
objChk varchar(255) primary key,
ModelName varchar(50),
Operator varchar(500),
PModelName varchar(50)
);
truncate TABLE tmpTable;  -- 使用前先清空临时表。

insert into tmpTable values(i_chars,i_chars,i_chars,i_chars);
insert into tmpTable values(i_chars,i_chars,i_chars,i_chars); -- 语句1
select * from tmpTable; -- 语句2
select count(*) into o_counts from tmpTable; -- 语句3
END;

异常捕获例子
CREATE DEFINER=`abandonship`@`%` PROCEDURE `P_TestException`()
BEGIN
declare _var,_err int default 0;
declare continue handler for sqlexception, sqlwarning, not found set _err=1;
insert into _t1(val1, val2) value(2012,'abandonship');
if _err=1 then
set _var = 2;
end if;

select case when _var = 2 then '出错了' else _var end;
END

limit 0;            mysql        以被用于强制 SELECT 语句返回指定的记录数。
--  set nocount on

set 要放在declare后面

判断是否存在的小例子：

DELIMITER $$
DROP PROCEDURE IF EXISTS dd;
CREATE PROCEDURE dd()
BEGIN
IF (NOT EXISTS (SELECT * FROM tm_order_goods WHERE order_sn='149507122391385')) THEN
SELECT '找不到订单149507122391385';
ELSE
SELECT '订单149507122391385已经存在';
END IF;
END$$
DELIMITER ;