QueryWrapper中eq的用法案例

public ResponseResult bind(DriverCarBindingRelationship driverCarBindingRelationship){                QueryWrapper queryWrapper = new QueryWrapper<>();     //查询包装器        //多种条件情况下进行查询，以下三种情况必须满足        queryWrapper.eq("driver_id",driverCarBindingRelationship.getDriverId());        queryWrapper.eq("car_id",driverCarBindingRelationship.getCarId());        queryWrapper.eq("bind_state",DriverCarConstants.DRIVER_CAR_BIND);        Integer integer = driverCarBindingRelationshipMapper.selectCount(queryWrapper);        if(integer.intValue()>0){            return ResponseResult.fail(CommonStatusEnum.DRIVER_CAR_BIND_EXIST.getCode(),CommonStatusEnum.DRIVER_CAR_BIND_EXIST.getValue());        }}

底层运行结果：

Creating a new SqlSession
SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@66061384] was not registered for synchronization because synchronization is not active
JDBC Connection [HikariProxyConnection@704441103 wrapping com.mysql.cj.jdbc.ConnectionImpl@4e911e70] will not be managed by Spring
> Preparing: SELECT COUNT( * ) FROM driver_car_binding_relationship WHERE (driver_id = ? AND car_id = ? AND bind_state = ?)
> Parameters: 53(Long), 6(Long), 1(Integer)
< Columns: COUNT( * )
< Row: 0
<== Total: 1
Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@66061384]

来源地址：https://blog.csdn.net/weixin_59479961/article/details/128019960