使用存储过程,在操作数据库时开启事务,避免并发时同时操作造成数据重复
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
|
CREATE DEFINER=`root`@`localhost` PROCEDURE `GetSerialNo`( IN tsCode VARCHAR (50), OUT result VARCHAR (200) )
BEGIN
DECLARE tsValue VARCHAR (50);
DECLARE tdToday VARCHAR (20);
DECLARE nowdate VARCHAR (20);
DECLARE tsQZ VARCHAR (50);
DECLARE t_error INTEGER DEFAULT 0;
DECLARE CONTINUE HANDLER FOR SQLEXCEPTION SET t_error=1;
START TRANSACTION ;
/* UPDATE sys_sno SET sValue=sValue WHERE sCode=tsCode; */
SELECT sValue INTO tsValue FROM sys_sno WHERE sCode=tsCode;
SELECT sQz INTO tsQZ FROM sys_sno WHERE sCode=tsCode ;
-- 因子表中没有记录,插入初始值
IF tsValue IS NULL THEN
SELECT CONCAT(DATE_FORMAT(NOW(), '%y%m' ), '0001' ) INTO tsValue;
UPDATE sys_sno SET sValue=tsValue WHERE sCode=tsCode ;
SELECT CONCAT(tsQZ,tsValue) INTO result;
ELSE SELECT SUBSTRING (tsValue,1,4) INTO tdToday;
SELECT CONVERT (DATE_FORMAT(NOW(), '%y%m' ),SIGNED) INTO nowdate;
-- 判断年月是否需要更新
IF tdToday = nowdate THEN
SET tsValue= CONVERT (tsValue,SIGNED) + 1;
ELSE
SELECT CONCAT(DATE_FORMAT(NOW(), '%y%m' ) , '0001' ) INTO tsValue ;
END IF;
UPDATE sys_sno SET sValue =tsValue WHERE sCode=tsCode;
SELECT CONCAT(tsQZ,tsValue) INTO result;
END IF;
IF t_error =1 THEN
ROLLBACK ;
SET result = 'Error' ;
ELSE
COMMIT ;
END IF;
SELECT result ;
END ;
dao
Integer getFaultNo(Map<String, String> parameterMap);
|
xml
1
2
3
4
5
6
7
8
9
10
11
|
< update id= "getFaultNo" parameterMap= "getFaultMap" statementType= "CALLABLE" >
CALL GetSerialNo(?,?)
</ update >
<! --
parameterMap.put( "tsCode" , 0);
parameterMap.put( "result" , -1);
-->
<parameterMap type= "java.util.Map" id= "getFaultMap" >
<parameter property= "tsCode" mode= "IN" jdbcType= "VARCHAR" />
<parameter property= "result" mode= "OUT" jdbcType= "VARCHAR" />
</parameterMap>
|
调用
1
2
3
4
5
6
7
8
9
10
11
|
Map<String, String> parameterMap = new HashMap<String, String>();
parameterMap.put( "tsCode" , "a" );
parameterMap.put( "result" , "-1" );
faultMapper.getFaultNo(parameterMap);
// insert 故障日志 (主表)
if (!parameterMap.get( "result" ).equals( "-1" ) &&
!parameterMap.get( "result" ).equals( "Error" )) {
//成功
} else {
throw new RuntimeException();
}
|
总结
以上所述是小编给大家介绍的mybatis+mysql 使用存储过程生成流水号的实现代码,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对服务器之家网站的支持!
原文链接:https://www.jianshu.com/p/d7570564f104