third_codes/mybatis-plus-join
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admin 2021-04-25 09:49:36 +08:00
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README.md
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@ -4,7 +4,7 @@
* [演示示例](https://gitee.com/best_handsome/mybatis-plus-join-demo) * [演示示例](https://gitee.com/best_handsome/mybatis-plus-join-demo)
QQ群:1022221898 QQ群:1022221898
## 使用方法 ## 使用方法
@ -116,7 +116,7 @@ class test {
void testJoin() { void testJoin() {
IPage<UserDTO> iPage = userMapper.selectJoinPage(new Page<>(2, 10), UserDTO.class, IPage<UserDTO> iPage = userMapper.selectJoinPage(new Page<>(2, 10), UserDTO.class,
Wrappers.<UserDO>lambdaJoin() new MPJLambdaWrapper<UserDO>()
.selectAll(UserDO.class) .selectAll(UserDO.class)
.select(UserAddressDO::getTel) .select(UserAddressDO::getTel)
.selectAs(UserAddressDO::getAddress, UserDTO::getUserAddress) .selectAs(UserAddressDO::getAddress, UserDTO::getUserAddress)
@ -157,7 +157,7 @@ class test {
void testJoin() { void testJoin() {
List<UserDTO> list = userMapper.selectJoinList(UserDTO.class, List<UserDTO> list = userMapper.selectJoinList(UserDTO.class,
Wrappers.<UserDO>queryJoin() new MPJLambdaWrapper<UserDO>()
.selectAll(UserDO.class) .selectAll(UserDO.class)
.select("addr.tel", "addr.address", "a.province") .select("addr.tel", "addr.address", "a.province")
.leftJoin("user_address addr on t.id = addr.user_id") .leftJoin("user_address addr on t.id = addr.user_id")
@ -197,16 +197,17 @@ WHERE (
* leftJoin() rightJoin() innerJoin() 传sql片段 格式 (表 + 别名 + 关联条件) * leftJoin() rightJoin() innerJoin() 传sql片段 格式 (表 + 别名 + 关联条件)
* 条件查询,可以查询主表以及参与连接的所有表的字段,全部调用mp原生的方法,正常使用没有sql注入风险 * 条件查询,可以查询主表以及参与连接的所有表的字段,全部调用mp原生的方法,正常使用没有sql注入风险
### 分页查询 #### 分页查询
```java ```java
class test { class test {
@Resource @Resource
private UserMapper userMapper; private UserMapper userMapper;
void testJoin() { void testJoin() {
IPage<UserDTO> page = userMapper.selectJoinPage(new Page<>(1, 10), UserDTO.class, IPage<UserDTO> page = userMapper.selectJoinPage(new Page<>(1, 10), UserDTO.class,
Wrappers.<UserDO>queryJoin() new MPJQueryWrapper<UserDO>()
.selectAll(UserDO.class) .selectAll(UserDO.class)
.select("addr.tel", "addr.address") .select("addr.tel", "addr.address")
.select("a.province") .select("a.province")
@ -234,7 +235,7 @@ FROM
LIMIT ?,? LIMIT ?,?
``` ```
### 还可以这么操作,但不建议 #### 还可以这么操作,但不建议
```java ```java
class test { class test {
@ -243,7 +244,7 @@ class test {
void testJoin() { void testJoin() {
List<UserDTO> list = userMapper.selectJoinList(UserDTO.class, List<UserDTO> list = userMapper.selectJoinList(UserDTO.class,
Wrappers.<UserDO>queryJoin() new MPJQueryWrapper<UserDO>()
.selectAll(UserDO.class) .selectAll(UserDO.class)
.select("addr.tel", "addr.address") .select("addr.tel", "addr.address")
//行列转换 //行列转换