DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
`id` bigint(20) NULL DEFAULT NULL COMMENT '主键',
`name` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '姓名',
`age` int(11) NULL DEFAULT NULL COMMENT '年龄',
`email` varchar(64) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '邮箱',
`manager_id` bigint(20) NULL DEFAULT NULL COMMENT '直属上级id',
`create_time` datetime(0) NULL DEFAULT NULL COMMENT '创建时间',
`update_time` datetime(0) NULL DEFAULT NULL COMMENT '修改时间',
`version` int(11) NULL DEFAULT 1 COMMENT '版本',
`deleted` int(1) NULL DEFAULT 0 COMMENT '逻辑删除标识(0,未删除;1,已删除)'
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;
INSERT INTO `user` VALUES (1234, '大boss', 40, '[email protected]', NULL, '2019-10-02 10:08:02', '2019-10-02 10:08:05', 1, 0);
INSERT INTO `user` VALUES (2345, '王天风', 25, '[email protected]', 1234, '2019-10-02 10:09:07', '2019-10-02 10:09:10', 1, 0);
INSERT INTO `user` VALUES (2346, '李艺伟', 28, '[email protected]', 2345, '2019-10-02 10:10:09', '2019-10-02 10:10:12', 1, 0);
INSERT INTO `user` VALUES (3456, '张雨绮', 31, '[email protected]', 2345, '2019-10-02 10:10:54', '2019-10-02 10:10:58', 1, 0);
INSERT INTO `user` VALUES (4566, '刘雨红', 32, '[email protected]', 2345, '2019-10-02 10:11:51', '2019-10-02 10:11:55', 1, 0);
SET FOREIGN_KEY_CHECKS = 1;
逻辑删除
设定逻辑删除规则
在配置文件中配置逻辑删除和逻辑未删除的值
mybatis-plus:
global-config:
logic-not-delete-value: 0
logic-delete-value: 1
在pojo类中在逻辑删除的字段加注解@TableLogic
@Data
@EqualsAndHashCode(callSuper = false)
public class User extends Model<User> {
@TableId(type = IdType.AUTO)
private Long id;
@TableField(condition = SqlCondition.LIKE)
private String name;
private Integer age;
private String email;
private Long managerId;
private LocalDateTime createTime;
private LocalDateTime updateTime;
private Integer version;
@TableLogic
private Integer deleted;
}
测试
通过id逻辑删除
@Test
public void deleteById(){
userMapper.deleteById(4566L);
}
查询中排除删除标识字段及注意事项
逻辑删除字段只是为了标识数据是否被逻辑删除,在查询的时候,并不想也将该字段查询出来。
我们只需要在delete字段上增加@TableField(select = false)
mybatisplus在查询的时候就会自动忽略该字段。
@Test
public void selectIgnoreDeleteTest(){
userMapper.selectById(3456L);
}
其他测试
package com.dsf.mp.fakeDelete.dao;
import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.dsf.mp.fakeDelete.FakeDeleteApp;
import com.dsf.mp.fakeDelete.entity.User;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import java.time.format.DateTimeFormatter;
import java.util.List;
@SuppressWarnings("SpringJavaInjectionPointsAutowiringInspection")
@RunWith(SpringRunner.class)
@SpringBootTest(classes = FakeDeleteApp.class)
public class UserMapperTest {
@Autowired
UserMapper userMapper;
@Test
public void insert() {
User user = new User();
user.setName("刘明强");
user.setAge(31);
user.setManagerId(1088248166370832385L);
user.setEmail("[email protected]");
int row = userMapper.insert(user);
System.out.println("影响记录数:"+row);
}
@Test
public void deleteById(){
int rows = userMapper.deleteById(1171357729945505793L);
System.out.println("影响行数:"+rows);
}
@Test
public void selectById(){
User user = userMapper.selectById(1171357729945505793L);
System.out.println(user);
}
@Test
public void updateById(){
User user = new User();
user.setAge(32);
user.setId(1171357729945505793L);
int rows = userMapper.updateById(user);
System.out.println("影响行数:"+rows);
}
@Test
public void mySelectList(){
List<User> list = userMapper.mySelectList(
Wrappers.<User>lambdaQuery()
// .select(User.class,x->!x.getColumn().equals("deleted")) //方式1
.select(User.class,x->!x.isLogicDelete()) //方式2
.gt(User::getAge, 25)
.eq(User::getDeleted,0)
);
list.forEach(System.out::println);
}
}
- 自定义sql,MybatisPlus不会忽略deleted属性,需要我们手动忽略。
自动填充
MybaitsPlus在我们插入数据或者更新数据的时候,为我们提供了自动填充功能。类似MySQL提供的默认值一样。
如果我们需要使用自动填充功能,我们需要在实体类的相应属性上加@TableField
注解,并指定什么时候进行自动填充。mybatisPlus为我们提供了三种填充时机,在FieldFill
枚举中。
public enum FieldFill {
/**
* 默认不处理
*/
DEFAULT,
/**
* 插入时填充字段
*/
INSERT,
/**
* 更新时填充字段
*/
UPDATE,
/**
* 插入和更新时填充字段
*/
INSERT_UPDATE
}
设置好之后,我们还需要编写具体的填充规则,具体是编写一个填充类并交给Spring管理,然后实现MetaObjectHandler
接口中的insertFill
和updateFill
方法。
Eg:
- 插入User对象的时候自动填充插入时间,更新User对象的时候自动填充更新时间。
- 指定实体类中需要自动填充的字段,并设置填充时机。
@Data
@EqualsAndHashCode(callSuper = false)
public class User extends Model<User> {
...
@TableField(fill = INSERT)
private LocalDateTime createTime;
@TableField(fill = UPDATE)
private LocalDateTime updateTime;
...
}
- 编写填充规则
@Component
public class MyMetaObjHandler implements MetaObjectHandler {
@Override
public void insertFill(MetaObject metaObject) {
if(metaObject.hasSetter("createTime")){
setInsertFieldValByName("createTime", LocalDateTime.now(),metaObject);
}
}
@Override
public void updateFill(MetaObject metaObject) {
if(metaObject.hasSetter("updateTime")){
setUpdateFieldValByName("updateTime",LocalDateTime.now(),metaObject);
}
}
}
解释一下为什么要用if判断是否有对应的属性
mybatisPlus在执行插入或者更新操作的时候,每次都会执行该方法,有些表中是没有设置自动填充字段的,而且有些自动填充字段的值的获取比较消耗系统性能,所以为了不必要的消耗,进行if判断,决定是否需要填充。
有些时候我们已经设置了属性的值。不想让mybatisPlus再自动填充,也就是说我们没有设置属性的值,mybatisPlus进行填充,如果设置了那么就用我们设置的值。这种情况我们只需要在填充类中提前获取默认值,然后使用该默认值就可以了。
@Override
public void updateFill(MetaObject metaObject) {
if(metaObject.hasSetter("updateTime")){
Object updateTime = getFieldValByName("updateTime", metaObject);
if(Objects.nonNull(updateTime)){
setUpdateFieldValByName("updateTime",updateTime,metaObject);
}else{
setUpdateFieldValByName("updateTime",LocalDateTime.now(),metaObject);
}
}
}
对 @TableField(fill = FieldFill.INSERT_UPDATE) 理解
并不是有了这个注解就能进到MyMetaObjHandler,更不是注解了1个字段进去1次,注解了2个字段进去2次,并不是的,只要我们实现了MyMetaObjHandler就都可以进去的,而且一次UPDATE OR INSERT操作只会进一次;只是是否对该字段拥有写入权限的问题,只要被标注,就会在自定义的MyMetaObjHandler里进行对该字段有写入权限,否则哪怕set了,也没效果。
乐观锁
乐观锁适用于读多写少的情况,更新数据的时候不使用“锁“而是使用版本号来判断是否可以更新数据。通过不加锁来减小数据更新时间和系统的性能消耗,进而提高数据库的吞吐量。CAS机制就是一种典型的乐观锁的形式。
乐观锁是逻辑存在的一种概念,我们如果使用乐观锁需要手动在表的加上version字段。
mysql使用乐观锁伪代码示例:
update user
set balabala....
where balabala... and version = xxx
配置类中注入乐观锁插件
@Bean
public OptimisticLockerInterceptor optimisticLockerInterceptor(){
return new OptimisticLockerInterceptor();
}
实体类中的版本字段增加@version
注解
@Data
@EqualsAndHashCode(callSuper = false)
public class User extends Model<User> {
...
@Version
private Integer version;
...
}
测试:更新王天风的年龄
@Test
public void testLock(){
int version = 1;
User user = new User();
user.setEmail("[email protected]");
user.setAge(34);
user.setId(2345L);
user.setManagerId(1234L);
user.setVersion(1);
userMapper.updateById(user);
}
数据库中的version已经变成2
/**
* 在 update(entity, wrapper) 方法下, wrapper 不能复用!!!
* 原因:
* 每应用一次QueryWrapper,都会自动为where子句添加一次version=?,两次应用就会添加两次,
* 出现形如“where ... and version=2 and version=3”的情况
* 解决:
* 重新创建一个QueryWrapper对象
*/
@Test
public void update() throws InterruptedException {
User user = userMapper.selectById(1171357729945505793L);
user.setAge(34);
LambdaQueryWrapper<User> query = Wrappers.<User>lambdaQuery().eq(User::getId, user.getId());
int rows1 = userMapper.update(user,query);//第一次用query
System.out.println("影响行数:"+rows1);
user = userMapper.selectById(1171357729945505793L);
user.setAge(35);
int rows2 = userMapper.update(user,query);//复用query
System.out.println("影响行数:"+rows2);
}
注意事项
- 支持的类型只有:int,Integer,long,Long,Date,Timestamp,LocalDateTime
- 整数类型下 newVerison = oldVersion+1
- newVersion会写到entity中
- 仅支持updateById(id)与update(entity,wrapper)方法
- 在update(entiry,wrapper)方法下,wrapper不能复用
性能分析
配置类中注入性能分析插件
@Bean
// @Profile({"dev,test"})
public PerformanceInterceptor performanceInterceptor() {
PerformanceInterceptor performanceInterceptor = new PerformanceInterceptor();
// 格式化sql输出
performanceInterceptor.setFormat(true);
// 设置sql执行最大时间,单位(ms)
performanceInterceptor.setMaxTime(5L);
return performanceInterceptor;
}
执行sql就可以打印sql执行的信息了
- 开启性能分析会消耗系统的性能,所以性能分析插件要配合
@Profile
注解执行使用的环境。
依靠第三方插件美化 SQL 输出
https://mp.baomidou.com/guide/p6spy.html
第三方依赖
<dependency>
<groupId>p6spy</groupId>
<artifactId>p6spy</artifactId>
<version>3.8.5</version>
</dependency>
更改配置文件中的dirver和url
spring:
datasource:
# driver-class-name: com.mysql.cj.jdbc.Driver
username: root
password: root
# url: jdbc:mysql://localhost:3306/test?serverTimezone=CTT&useUnicode=true&characterEncoding=utf-8&allowMultiQueries=true
driver-class-name: com.p6spy.engine.spy.P6SpyDriver
url: jdbc:p6spy:mysql://localhost:3306/test?serverTimezone=CTT&useUnicode=true&characterEncoding=utf-8&allowMultiQueries=true
增加spy.properties配置文件
module.log=com.p6spy.engine.logging.P6LogFactory,com.p6spy.engine.outage.P6OutageFactory
# 自定义日志打印
logMessageFormat=com.baomidou.mybatisplus.extension.p6spy.P6SpyLogger
#日志输出到控制台
appender=com.baomidou.mybatisplus.extension.p6spy.StdoutLogger
# 使用日志系统记录 sql
#appender=com.p6spy.engine.spy.appender.Slf4JLogger
# 设置 p6spy driver 代理
deregisterdrivers=true
# 取消JDBC URL前缀
useprefix=true
# 配置记录 Log 例外,可去掉的结果集有error,info,batch,debug,statement,commit,rollback,result,resultset.
excludecategories=info,debug,result,batch,resultset
# 日期格式
dateformat=yyyy-MM-dd HH:mm:ss
# 实际驱动可多个
#driverlist=org.h2.Driver
# 是否开启慢SQL记录
outagedetection=true
# 慢SQL记录标准 2 秒
outagedetectioninterval=2
测试
打印到文件
- 开启美化SQL插件会消耗系统的性能,所以插件要配合
@Profile
注解执行使用的环境。
多租户
常用情景:一条记录操作者的自动赋值!
过滤方式:传统过滤、注解过滤。
过滤维度:表级过滤、SQL语句过滤。
package com.dsf.mp.tenant.dao;
import com.baomidou.mybatisplus.annotation.SqlParser;
import com.baomidou.mybatisplus.core.conditions.Wrapper;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.baomidou.mybatisplus.core.toolkit.Constants;
import com.dsf.mp.tenant.entity.User;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;
import java.util.List;
public interface UserMapper extends BaseMapper<User> {
//通过注解的方式过滤掉自定义sql方法的sql解析,false-不过滤sql解析,true-过滤sql解析
@SqlParser(filter = true)
@Select("select * from user ${ew.customSqlSegment}")
List<User> mySelectList(@Param(Constants.WRAPPER)Wrapper<User> wrapper);
}
package com.dsf.mp.tenant.configuration;
import com.baomidou.mybatisplus.core.parser.ISqlParser;
import com.baomidou.mybatisplus.core.parser.ISqlParserFilter;
import com.baomidou.mybatisplus.core.parser.SqlParserHelper;
import com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor;
import com.baomidou.mybatisplus.extension.plugins.tenant.TenantHandler;
import com.baomidou.mybatisplus.extension.plugins.tenant.TenantSqlParser;
import net.sf.jsqlparser.expression.Expression;
import net.sf.jsqlparser.expression.LongValue;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.reflection.MetaObject;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import java.util.ArrayList;
@Configuration
public class MybatisPlusConf {
@Bean
PaginationInterceptor paginationInterceptor(){
PaginationInterceptor paginationInterceptor = new PaginationInterceptor();
ArrayList<ISqlParser> sqlParsersList = new ArrayList<>();
TenantSqlParser tenantSqlParser = new TenantSqlParser();
tenantSqlParser.setTenantHandler(new TenantHandler() {
/**
* 租户ID,通常指公司代码或ID,获取途径包括:session、配置文件、枚举类、cookie、redis
* 这里的ID是写死的,实际项目中要想办法获取
*/
@Override
public Expression getTenantId() {
return new LongValue(1088248166370832385L);
}
/**
* 指定租户ID的表列名
*/
@Override
public String getTenantIdColumn() {
return "manager_id";
}
/**
* 过滤掉(即不引入)哪些表的多租户功能
* false-过滤,默认; true-不过滤;
*/
@Override
public boolean doTableFilter(String tableName) {
if("user".equals(tableName)){
return false;
}
return true;
}
});
sqlParsersList.add(tenantSqlParser);
paginationInterceptor.setSqlParserList(sqlParsersList);
/**
* 过滤掉(即不引入)哪些方法的sql解析(即不进行多租户功能)
*/
paginationInterceptor.setSqlParserFilter(new ISqlParserFilter() {
@Override
public boolean doFilter(MetaObject metaObject) {
MappedStatement ms = SqlParserHelper.getMappedStatement(metaObject);
if("com.dsf.mp.tenant.dao.UserMapper.selectById".equals(ms.getId())){
return true;
}
return false;
}
});
return paginationInterceptor;
}
}
package com.dsf.mp.tenant;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
@MapperScan("com.dsf.mp.tenant.dao")
public class TenantApp {
public static void main(String[] args) {
SpringApplication.run(TenantApp.class, args);
}
}
package com.dsf.mp.tenant.dao;
import com.baomidou.mybatisplus.core.conditions.Wrapper;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.dsf.mp.tenant.TenantApp;
import com.dsf.mp.tenant.entity.User;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import java.util.List;
import static org.junit.Assert.*;
@SuppressWarnings("SpringJavaInjectionPointsAutowiringInspection")
@RunWith(SpringRunner.class)
@SpringBootTest(classes = TenantApp.class)
public class UserMapperTest {
@Autowired
UserMapper userMapper;
/**
* 测试多租户查询方法
* 效果:where ... and manager_id=1088248166370832385
*/
@Test
public void selectList(){
List<User> list = userMapper.selectList(null);
list.forEach(System.out::println);
}
/**
* 测试多租户更新方法
*/
@Test
public void updateById(){
User user = userMapper.selectById(1094592041087729666L);
user.setAge(34);
int rows = userMapper.updateById(user);
System.out.println("受影响的行数:"+rows);
}
/**
* 测试多租户插入方法
*/
@Test
public void insert(){
User user = new User();
user.setName("李国民");
user.setAge(29);
user.setEmail("[email protected]");
int rows = userMapper.insert(user);
System.out.println("受影响的行数:"+rows);
}
/**
* 测试过滤掉内置方法的多租户功能
*/
@Test
public void selectById(){
User user = userMapper.selectById(1094590409767661570L);
System.out.println(user);
}
/**
* 测试过滤掉自定义方法的多租户功能
*/
@Test
public void mySelectList(){
List<User> list = userMapper.mySelectList(
Wrappers.<User>lambdaQuery().gt(User::getAge,30)
);
list.forEach(System.out::println);
}
}
# 配置数据源
spring:
datasource:
driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://testhost:3306/mp?useUnicode=true&characterEncoding=utf8&serverTimezone=Asia/Shanghai
username: root
password: '#Dsf135246'
# 配置日志
logging:
level:
root: warn
com.dsf.mp.tenant.dao: trace
pattern:
console: '%p%m%n'
mybatis-plus:
mapper-locations: ['classpath:/mapper/*Mapper.xml']
# global-config.sql-parser-cache: true #3.1.1以上版本不需要配置该项
动态表名
应用场景:同样的表分表时的操作!
package com.dsf.mp.dynamicTableNameParser.entity;
import lombok.Data;
import java.time.LocalDateTime;
@Data
public class User {
private Long id;
private String name;
private Integer age;
private String email;
private Long managerId;
private LocalDateTime createTime;
private LocalDateTime updateTime;
private Integer version;
private Integer deleted;
}
package com.dsf.mp.dynamicTableNameParser.dao;
import com.baomidou.mybatisplus.annotation.SqlParser;
import com.baomidou.mybatisplus.core.conditions.Wrapper;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.baomidou.mybatisplus.core.toolkit.Constants;
import com.dsf.mp.dynamicTableNameParser.entity.User;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;
import java.util.List;
public interface UserMapper extends BaseMapper<User> {
// 通过注解的方式过滤掉自定义sql方法的sql解析,false-不过滤sql解析,true-过滤sql解析
@SqlParser(filter = false)
@Select("select * from user ${ew.customSqlSegment}")
List<User> mySelectList(@Param(Constants.WRAPPER) Wrapper<User> wrapper);
}
package com.dsf.mp.dynamicTableNameParser.configuration;
import com.baomidou.mybatisplus.core.parser.ISqlParser;
import com.baomidou.mybatisplus.core.parser.ISqlParserFilter;
import com.baomidou.mybatisplus.core.parser.SqlParserHelper;
import com.baomidou.mybatisplus.extension.parsers.DynamicTableNameParser;
import com.baomidou.mybatisplus.extension.parsers.ITableNameHandler;
import com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.reflection.MetaObject;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
@Configuration
public class MybatisPlusConf {
//user动态表存放对象
public static ThreadLocal<String> myTableName=new ThreadLocal<>();
@Bean
PaginationInterceptor paginationInterceptor(){
PaginationInterceptor paginationInterceptor = new PaginationInterceptor();
ArrayList<ISqlParser> sqlParsersList = new ArrayList<>();
//动态表名解析器
Map<String, ITableNameHandler> tableNameHandlerMap = new HashMap<>();
tableNameHandlerMap.put("user", new ITableNameHandler() {
@Override
public String dynamicTableName(MetaObject metaObject, String sql, String tableName) {
return myTableName.get();
}
});
DynamicTableNameParser dynamicTableNameParser = new DynamicTableNameParser();
dynamicTableNameParser.setTableNameHandlerMap(tableNameHandlerMap);
sqlParsersList.add(dynamicTableNameParser);
paginationInterceptor.setSqlParserList(sqlParsersList);
/**
* 过滤掉(即不引入)哪些方法的sql解析功能(即不进行动态表名替换)
*/
paginationInterceptor.setSqlParserFilter(new ISqlParserFilter() {
@Override
public boolean doFilter(MetaObject metaObject) {
MappedStatement ms = SqlParserHelper.getMappedStatement(metaObject);
if("com.dsf.mp.dynamicTableNameParser.dao.UserMapper.selectById".equals(ms.getId())){
return true;
}
return false;
}
});
return paginationInterceptor;
}
}
# 配置数据源
spring:
datasource:
driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://testhost:3306/mp?useUnicode=true&characterEncoding=utf8&serverTimezone=Asia/Shanghai
username: root
password: '#Dsf135246'
# 配置日志
logging:
level:
root: warn
com.dsf.mp.dynamicTableNameParser.dao: trace
pattern:
console: '%p%m%n'
mybatis-plus:
mapper-locations: ['classpath:/mapper/*Mapper.xml']
package com.dsf.mp.dynamicTableNameParser.dao;
import com.baomidou.mybatisplus.core.MybatisConfiguration;
import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.dsf.mp.dynamicTableNameParser.DynamicTableNameParserApp;
import com.dsf.mp.dynamicTableNameParser.configuration.MybatisPlusConf;
import com.dsf.mp.dynamicTableNameParser.entity.User;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import java.util.List;
@SuppressWarnings("SpringJavaInjectionPointsAutowiringInspection")
@RunWith(SpringRunner.class)
@SpringBootTest(classes = DynamicTableNameParserApp.class)
public class UserMapperTest {
@Autowired
UserMapper userMapper;
/**
* 测试动态表名查询方法
*/
@Test
public void selectList(){
MybatisPlusConf.myTableName.set("user_2019");
List<User> list = userMapper.selectList(null);
list.forEach(System.out::println);
}
/**
* 测试动态表名更新方法
*/
@Test
public void updateById(){
MybatisPlusConf.myTableName.set("user_2019");
User user = userMapper.selectById(1094592041087729666L);
user.setAge(34);
int rows = userMapper.updateById(user);
System.out.println("受影响的行数:"+rows);
}
/**
* 测试动态表名插入方法
*/
@Test
public void insert(){
MybatisPlusConf.myTableName.set("user_2019");
User user = new User();
user.setName("李国民");
user.setAge(29);
user.setEmail("[email protected]");
int rows = userMapper.insert(user);
System.out.println("受影响的行数:"+rows);
}
/**
* 测试过滤掉内置方法的动态表名
*/
@Test
public void selectById(){
MybatisPlusConf.myTableName.set("user_2019");
User user = userMapper.selectById(1094590409767661570L);
System.out.println(user);
}
/**
* 测试过滤掉自定义方法的动态表名
*/
@Test
public void mySelectList(){
MybatisPlusConf.myTableName.set("user_2019");
List<User> list = userMapper.mySelectList(
Wrappers.<User>lambdaQuery().gt(User::getAge,30)
);
list.forEach(System.out::println);
}
}
SQL注入器:封装自定义通用SQL
实现步骤
- 创建定义方法的类
- 创建注入器
- 在mapper中加入自定义方法
package com.dsf.mp.sqlInjector.entity;
import com.baomidou.mybatisplus.annotation.FieldFill;
import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableLogic;
import lombok.Data;
import java.time.LocalDateTime;
@Data
public class User {
private Long id;
private String name;
@TableField(fill= FieldFill.UPDATE)
private Integer age;
private String email;
private Long managerId;
private LocalDateTime createTime;
private LocalDateTime updateTime;
private Integer version;
@TableLogic
@TableField(select=false)
private Integer deleted;
}
package com.dsf.mp.sqlInjector.component.method;
import com.baomidou.mybatisplus.core.injector.AbstractMethod;
import com.baomidou.mybatisplus.core.metadata.TableInfo;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.mapping.SqlSource;
public class DeleteAllMethod extends AbstractMethod {
@Override
public MappedStatement injectMappedStatement(Class<?> mapperClass, Class<?> modelClass, TableInfo tableInfo) {
//执行的sql
String sql = "delete from "+tableInfo.getTableName();
//mapper接口的方法名
String method = "deleteAll";
SqlSource sqlSource = languageDriver.createSqlSource(configuration,sql,modelClass);
return addDeleteMappedStatement(mapperClass,method,sqlSource);
}
}
package com.dsf.mp.sqlInjector.dao;
import com.baomidou.mybatisplus.annotation.SqlParser;
import com.baomidou.mybatisplus.core.conditions.Wrapper;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.baomidou.mybatisplus.core.toolkit.Constants;
import com.dsf.mp.sqlInjector.entity.User;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;
import java.util.List;
public interface UserMapper extends MyBaseMapper<User> {
@SqlParser(filter = true)
@Select("select * from user ${ew.customSqlSegment}")
List<User> mySelectList(@Param(Constants.WRAPPER) Wrapper<User> wrapper);
//如果只想在本接口中调用自定义的method可以直接写到这里
// int deleteAll();
}
package com.dsf.mp.sqlInjector.dao;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.baomidou.mybatisplus.core.toolkit.Constants;
import org.apache.ibatis.annotations.Param;
import java.util.List;
public interface MyBaseMapper<T> extends BaseMapper<T> {
int deleteAll();
int insertBatchSomeColumn(List<T> list);
int deleteByIdWithFill(T t);
int alwaysUpdateSomeColumnById(@Param((Constants.ENTITY)) T entity);
}
package com.dsf.mp.sqlInjector.component;
import com.baomidou.mybatisplus.core.injector.AbstractMethod;
import com.baomidou.mybatisplus.core.injector.DefaultSqlInjector;
import com.baomidou.mybatisplus.extension.injector.methods.additional.AlwaysUpdateSomeColumnById;
import com.baomidou.mybatisplus.extension.injector.methods.additional.InsertBatchSomeColumn;
import com.baomidou.mybatisplus.extension.injector.methods.additional.LogicDeleteByIdWithFill;
import com.dsf.mp.sqlInjector.component.method.DeleteAllMethod;
import org.springframework.stereotype.Component;
import java.util.List;
@Component
public class MySqlInjector extends DefaultSqlInjector {
@Override
public List<AbstractMethod> getMethodList(Class<?> mapperClass) {
//一定要调用super.getMethodList,否则内置的方法全都不能用了
List<AbstractMethod> methodList = super.getMethodList(mapperClass);
//添加自定的方法组件:删除全部
methodList.add(new DeleteAllMethod());
//添加选装件:批量插入
// methodList.add(new InsertBatchSomeColumn(x->!x.isLogicDelete()));
methodList.add(new InsertBatchSomeColumn(x->!x.isLogicDelete()&&!x.getColumn().equals("age")));//构造器中指定哪些字段插入,哪些不插入
//添加选装件:逻辑删除并填充
methodList.add(new LogicDeleteByIdWithFill());
//添加选装件:根据id更新固定的字段
methodList.add(new AlwaysUpdateSomeColumnById(x->!x.getColumn().equals("name")));//构造器中指定哪些字段更新,哪些不更新
return methodList;
}
}
- 除了自定义的类,还有一些MP官方自带的选装件。
package com.dsf.mp.sqlInjector.dao;
import com.dsf.mp.sqlInjector.SqlInjectorApp;
import com.dsf.mp.sqlInjector.entity.User;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import java.util.Arrays;
import java.util.List;
import static org.junit.Assert.*;
@SuppressWarnings("SpringJavaInjectionPointsAutowiringInspection")
@RunWith(SpringRunner.class)
@SpringBootTest(classes = SqlInjectorApp.class)
public class UserMapperTest {
@Autowired
UserMapper userMapper;
/**
* 测试自定义方法组件:删除全部
*/
@Test
public void deleteAll(){
int rows = userMapper.deleteAll();
System.out.println("受影响的行数:"+rows);
}
/**
* 测试选装件:批量删除
* 如果插入时字段为null,则不管数据库是否设置默认值,插入的数据均是null
*/
@Test
public void insertBatchSomeColumn(){
User user1 = new User();
user1.setName("李兴华");
user1.setAge(34);
user1.setManagerId(1088248166370832385L);
User user2 = new User();
user2.setName("杨红");
user2.setAge(29);
user2.setManagerId(1088248166370832385L);
List<User> asList= Arrays.asList(user1,user2);
int rows = userMapper.insertBatchSomeColumn(asList);
System.out.println("受影响的行数"+rows);
}
/**
* 测试选装件:逻辑删除并填充
*/
@Test
public void deleteByIdWithFill(){
User user = userMapper.selectById(1171846939462836226L);
// user.setAge(23);
int rows = userMapper.deleteByIdWithFill(user);
System.out.println("受影响的行数"+rows);
}
/**
* 测试选装件:根据id更新固定的字段
*/
@Test
public void alwaysUpdateSomeColumnById(){
User user = userMapper.selectById(1088248166370832385L);
user.setAge(26);
user.setName("王地缝");
int rows = userMapper.alwaysUpdateSomeColumnById(user);
System.out.println("受影响的行数"+rows);
}
}