SELECT * FROM T_BUSINESS_VIRTUAL_LOCATION WHERE F_TRAY_CODE = (SELECT TOP 1 F_TRAY_CODE FROM T_BUSINESS_STOCK_BILL WHERE F_STATUS = #{status} AND F_TYPE = #{type} AND F_IS_VIRTUAL = '1' ORDER BY MAKE_TIME ASC) 用QueryWrapper改造 sqlservier数据库
时间: 2023-08-27 19:04:10 浏览: 46
可以使用如下的QueryWrapper改造该SQL语句:
```
QueryWrapper<BUSINESS_VIRTUAL_LOCATION> queryWrapper = new QueryWrapper<>();
queryWrapper.eq("F_TRAY_CODE",
new QueryWrapper<BUSINESS_STOCK_BILL>()
.select("TOP 1 F_TRAY_CODE")
.eq("F_STATUS", status)
.eq("F_TYPE", type)
.eq("F_IS_VIRTUAL", "1")
.orderByAsc("MAKE_TIME")
);
List<BUSINESS_VIRTUAL_LOCATION> list = businessVirtualLocationMapper.selectList(queryWrapper);
```
这里的`businessVirtualLocationMapper`是`BUSINESS_VIRTUAL_LOCATION`表对应的Mapper接口,需要根据具体情况进行修改。另外,需要注意SQL语句中的`#{status}`和`#{type}`需要替换为具体的参数值。
相关问题
SELECT * FROM T_BUSINESS_VIRTUAL_LOCATION WHERE F_TRAY_CODE = (SELECT TOP 1 F_TRAY_CODE FROM T_BUSINESS_STOCK_BILL WHERE F_IS_VIRTUAL = '1' ORDER BY MAKE_TIME ASC) 用queryWrapper().lambda().select改造 sqlserver数据库
可以使用下面的代码来实现上述SQL查询:
```
queryWrapper().lambda().select(VirtualLocation::getId, VirtualLocation::getName)
.eq(VirtualLocation::getTrayCode,
Wrappers.<VirtualLocation>lambdaQuery()
.select(StockBill::getTrayCode)
.eq(StockBill::getIsVirtual, "1")
.orderByAsc(StockBill::getMakeTime)
.last("FETCH FIRST 1 ROWS ONLY")
);
```
在这里,我们使用了queryWrapper().lambda().select方法来指定需要查询的字段,使用eq方法来实现WHERE条件的指定。
在子查询中,我们使用了Wrappers.<VirtualLocation>lambdaQuery()方法来创建一个子查询,用于查询满足条件的第一个可用的托盘编码。子查询中只是用了StockBill::getIsVirtual等实体类字段的引用来指定查询条件,使用orderByAsc方法来指定按照创建时间升序排序,并使用last方法来指定只返回第一条记录。最后,我们使用了FETCH FIRST 1 ROWS ONLY来实现只返回第一条记录的功能。
最终生成的SQL语句类似于:
```
SELECT id, name FROM T_BUSINESS_VIRTUAL_LOCATION WHERE F_TRAY_CODE = (
SELECT F_TRAY_CODE FROM T_BUSINESS_STOCK_BILL WHERE F_IS_VIRTUAL = '1' ORDER BY MAKE_TIME ASC FETCH FIRST 1 ROWS ONLY
)
```
libburn.h中struct burn_drive
在 libburn.h 中,struct burn_drive 是一个结构体,用于描述一个可写光盘驱动器的属性和状态。它包含了驱动器的一些基本信息,如驱动器的名称、类型、状态等,同时也包含了一些操作驱动器的函数指针,如读、写、检测、清除等。这个结构体的定义如下:
```
struct burn_drive {
char *name;
char *vendor;
char *model;
int type;
int status;
int media_status;
int speed;
int mmc_profile;
int mmc_capabilities;
int feature_set;
int load_eject;
int tray_open;
int blank_state;
int writable;
int overwritable;
int appendable;
int reserve_track;
int mcn_valid;
char mcn[14];
int isrc_valid;
char isrc[13];
int is_open;
int fd;
off_t capacity;
struct burn_drive_info *info;
struct burn_session_info *session_info;
struct burn_track_info *track_info;
struct burn_disc_info *disc_info;
struct burn_write_opts *write_opts;
struct burn_disc_cache *disc_cache;
struct burn_source *source;
struct burn_progress *progress;
void *priv;
int (*read)(struct burn_drive *, void *, size_t, off_t);
int (*write)(struct burn_drive *, const void *, size_t, off_t);
int (*check)(struct burn_drive *, off_t);
int (*clear)(struct burn_drive *, off_t);
int (*blank)(struct burn_drive *);
int (*finalize)(struct burn_drive *);
int (*eject)(struct burn_drive *);
int (*load)(struct burn_drive *);
int (*get_speed)(struct burn_drive *, int *);
int (*set_speed)(struct burn_drive *, int);
int (*get_status)(struct burn_drive *, int *);
int (*get_media_status)(struct burn_drive *, int *);
int (*get_capacity)(struct burn_drive *, off_t *);
int (*lock_door)(struct burn_drive *);
int (*query_format)(struct burn_drive *, const char *, int *);
int (*set_write_opts)(struct burn_drive *, struct burn_write_opts *);
int (*get_write_opts)(struct burn_drive *, struct burn_write_opts *);
};
```
这个结构体的具体用法可以参考libburn.h和libburn的相关文档。