mysql+mybatis实现存储过程+事务 + 多并发流水号获取
数据库存储过程
DROP PROCEDURE IF EXISTS `generate_serial_number_by_date`;
CREATE PROCEDURE `generate_serial_number_by_date`(
IN param_key varchar(100),
IN param_org_id bigint,
IN param_period_date_format varchar(20),
OUT result bigint,
OUT current_datestr varchar(20))
begin
declare old_datestr varchar(20);
START TRANSACTION;
if param_period_date_format=’infinite’ then
set current_datestr = ‘00000000’;
else
set current_datestr = DATE_FORMAT(NOW(), param_period_date_format);
end if;
select
number, datestr
from sys_serial_number
where table_key = param_key
and org_id = param_org_id
and period_date_format = param_period_date_format
into result, old_datestr
for update;
IF result is null then
set result = 1;
insert into sys_serial_number(table_key, org_id, period_date_format, datestr, number, description)
values(param_key, param_org_id, param_period_date_format, current_datestr, 1, ‘add by procedure’);
elseif old_datestr != current_datestr then
set result = 1;
update sys_serial_number
set number = 1,
datestr = current_datestr
where table_key = param_key
and org_id = param_org_id
and period_date_format = param_period_date_format;
end if;
update sys_serial_number set number = number + 1
where table_key = param_key
and org_id = param_org_id
and period_date_format = param_period_date_format;
commit;
end流水号表
DROP TABLE IF EXISTS `sys_serial_number`;
CREATE TABLE `sys_serial_number` (
`table_key` varchar(100) NOT NULL COMMENT ‘主键（建议用表名）’,
`org_id` bigint(20) NOT NULL DEFAULT ‘0’ COMMENT ‘分公司ID’,
`number` bigint(20) NOT NULL DEFAULT ‘1’ COMMENT ‘流水号（存储过程控制递增，获取完后+1）’,
`period_date_format` varchar(20) NOT NULL COMMENT ‘流水号生成周期日期格式’,
`datestr` varchar(20) DEFAULT NULL COMMENT ‘流水号日期值’,
`description` varchar(100) DEFAULT NULL COMMENT ‘描述’,
PRIMARY KEY (`table_key`,`org_id`,`period_date_format`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 ROW_FORMAT=DYNAMIC COMMENT=’流水号生成表’;mybatis配置
<select id=”generateSerialNumber” parameterType=”java.util.HashMap” statementType=”CALLABLE”>
<![CDATA[
{
call generate_serial_number (
#{param_key,mode=IN,jdbcType=VARCHAR},
#{param_org_id,mode=IN,jdbcType=BIGINT},
#{result,mode=OUT,jdbcType=BIGINT}
)
}
]]>
</select>测试代码
@Override
public Map<String, Object> generateSerialNumber(Map<String, Object> param) {
sysSerialNumberMAPPer.generateSerialNumber(param);
return param;
}
final Map<String, Object> param = new HashMap<String, Object>();
param.put(“param_key”,”contract”);
param.put(“param_orgId”, 84);
new Thread(new Runnable() {
@Override
public void run() {
for(int i =0; i<100; i++) {
Map<String, Object> map = serialNumberProvider.generateSerialNumber(param);
System.out.println(“thread-1：” + map.get(“result”));
}
}
}).start();
new Thread(new Runnable() {
@Override
public void run() {
for(int i =0; i<100; i++) {
Map<String, Object> map = serialNumberProvider.generateSerialNumber(param);
System.out.println(“thread-2：” + map.get(“result”));
}
}
}).start();
new Thread(new Runnable() {
@Override
public void run() {
for(int i =0; i<100; i++) {
Map<String, Object> map = serialNumberProvider.generateSerialNumber(param);
System.out.println(“thread-3：” + map.get(“result”));
}
}
}).start();
byte[] b = new byte[0];
synchronized(b) {
b.wait();
}如果运行代码报以下错误
### SQL:
{
call generate_serial_number_by_date (
?, ?, ?, ?, ?
)
}
### Cause: java.sql.SQLException: Parameter number 4 is not an OUT parameter
; SQL []; Parameter number 4 is not an OUT parameter; nested exception is java.sql.SQLException: Parameter number 4 is not an OUT parameter
排查方法：
1、检查存储过程是否正确创建
2、检查数据源连接用户是否有存储过程执行权限
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