mysql+mybatis实现存储过程+事务 + 多并发流水号获取，

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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