java中常规使用的mysql语句

1.存在型验证 select 1, 例如:

SELECT
1
FROM
worker
WHERE
phone = 18611406603    存在为1,否则为空

2.登录型校验 limit 1,例如:

SELECT
`password`
FROM
worker
WHERE
phone = 18611406603
LIMIT 1

　　结果无值,不需验证;有值,校验

3.数量型查询 SELECT COUNT(1) 例如:

SELECT
COUNT(1)
FROM
worker
WHERE
phone = 18611406603

4.字段型查询 

SELECT
`password`
FROM
worker
WHERE
phone = 18611406603

java中常规使用的mysql语句

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