mysql+mybatis+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,1)">IN param_period_date_format 20))
begin 

        declare old_datestr );
        
        START TRANSACTION; 

        if param_period_date_format='infinite' then 
            set current_datestr = 00000000';
    else
            = DATE_FORMAT(NOW(),param_period_date_format);
        end if;
        
        select 
                    numberfrom 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,values(param_key,param_org_id,param_period_date_format,current_datestr,1,add by procedure);
        
        elseif old_datestr != current_datestr  sys_serial_number 
                    set number  current_datestr 
             param_key 
                     param_org_id 
                     param_period_date_format;
            
        update sys_serial_number = + 1 
             param_period_date_format;
    commit;
end

流水号表

TABLE  `sys_serial_number`;
TABLE `sys_serial_number` (
  `table_key` 100) NOT NULL COMMENT 主键（建议用表名）bigint(20) NULL DEFAULT 0' COMMENT 分公司IDnumber` 1流水号（存储过程控制递增，获取完后+1）流水号生成周期日期格式20) DEFAULT 流水号日期值100) 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,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,1)">();
        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();

         serialNumberProvider.generateSerialNumber(param);
                    System.out.println("thread-2：" + map.get("result" serialNumberProvider.generateSerialNumber(param);
                    System.out.println("thread-3：" + map.get("result"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

（编辑：李大同）

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