mybatis-plus官方
导入maven
com.baomidou mybatis-plus-boot-starter 3.4.2
更新yml文件
#mybatis-plus mybatis-plus: mapperPackage: com.xn.mapper typeAliasesPackage: com.xn.mapper mapperLocations: classpath:mapper/*.xml global-config: db-config: id-type: none configuration: # 字段下划线转驼峰 map-underscore-to-camel-case: false log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
添加扩展文件
（用于扩展 分页/批量新增修改/更多的方法修改 基础可以不加）
BaseEntity 用于定义model
model继承后可以 id自增会回填，更新时间在修改时刷新，创建时间在创建时刷新
import com.baomidou.mybatisplus.annotation.FieldFill;
import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableId;
import lombok.AllArgsConstructor;
import lombok.Getter;
import lombok.NoArgsConstructor;
import lombok.Setter;
import lombok.experimental.SuperBuilder;
import java.io.Serializable;
import java.util.Date;
@Getter
@Setter
@SuperBuilder
@NoArgsConstructor
@AllArgsConstructor
public abstract class BaseEntity implements Serializable {
/**
* 创建时间 自增方式
*/
@TableField(fill = FieldFill.INSERT)
public Date create_time;
/**
* 更新时间
*/
@TableField(fill = FieldFill.INSERT_UPDATE)
public Date update_time;
/**
* ID
*/
@TableId(value="id" ,type = IdType.AUTO)
private Long id;
}
CreateAndUpdateMetaObjectHandler
设置刷新 更新时间 创建时间
import com.baomidou.mybatisplus.core.handlers.MetaObjectHandler;
import org.apache.ibatis.reflection.MetaObject;
import java.util.Date;
/**
* MP注入处理器
*/
public class CreateAndUpdateMetaObjectHandler implements MetaObjectHandler {
public String CREATE_TIME = "create_time";
public String UPDATE_TIME = "update_time";
@Override
public void insertFill(MetaObject metaObject) {
if (metaObject.hasGetter(CREATE_TIME)) {
if (metaObject.getValue(CREATE_TIME) == null) {
this.setFieldValByName(CREATE_TIME, new Date(), metaObject);
}
}
}
@Override
public void updateFill(MetaObject metaObject) {
if (metaObject.hasGetter(UPDATE_TIME)) {
if (metaObject.getValue(UPDATE_TIME) == null) {
this.setFieldValByName(UPDATE_TIME, new Date(), metaObject);
}
}
}
}
批量插入/更新 mapper需要继承这个接口
import com.baomidou.mybatisplus.core.mapper.BaseMapper; import java.util.List; /** * 自定义 Mapper 接口, 实现 自定义扩展 * */ public interface BaseMapperPlusextends BaseMapper { /** * 批量插入（mysql） * @param entityList * @return */ Integer insertBatchSomeColumn(List entityList); /** * 批量更新（mysql） * @param entityList * @return */ Integer updateBatchSomeColumn(List entityList); }
将批量方法放到 sql注入器中
import com.baomidou.mybatisplus.core.injector.AbstractMethod;
import com.baomidou.mybatisplus.core.injector.DefaultSqlInjector;
import com.baomidou.mybatisplus.extension.injector.methods.InsertBatchSomeColumn;
import java.util.List;
/**
* mybatis + sql注入器
*/
public class MybatisPlusSqlInjector extends DefaultSqlInjector {
@Override
public List getMethodList(Class mapperClass) {
List methodList = super.getMethodList(mapperClass);
// 添加InsertBatchSomeColumn方法
methodList.add(new InsertBatchSomeColumn());
methodList.add(new UpdateBatchSomeColumn());
return methodList;
}
实现批量更新的方法
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;
/**
* 批处理更新一些列
*
*/
public class UpdateBatchSomeColumn extends AbstractMethod {
@Override
public MappedStatement injectMappedStatement(Class mapperClass, Class modelClass, TableInfo tableInfo) {
String sql = "";
String additional = tableInfo.isWithVersion() ? tableInfo.getVersionFieldInfo().getVersionOli("item", "item.") : "" + tableInfo.getLogicDeleteSql(true, true);
String setSql = sqlSet(tableInfo.isWithLogicDelete(), false, tableInfo, false, "item", "item.");
String sqlResult = String.format(sql, tableInfo.getTableName(), setSql, tableInfo.getKeyColumn(), "item." + tableInfo.getKeyProperty(), additional);
SqlSource sqlSource = languageDriver.createSqlSource(configuration, sqlResult, modelClass);
return this.addUpdateMappedStatement(mapperClass, modelClass, "updateBatchSomeColumn", sqlSource);
}
}
mybatis-plus配置类
import com.baomidou.mybatisplus.annotation.DbType;
import com.baomidou.mybatisplus.core.handlers.MetaObjectHandler;
import com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor;
import com.baomidou.mybatisplus.extension.plugins.inner.OptimisticLockerInnerInterceptor;
import com.baomidou.mybatisplus.extension.plugins.inner.PaginationInnerInterceptor;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.transaction.annotation.EnableTransactionManagement;
/**
* mybatis-plus配置类
*/
@EnableTransactionManagement(proxyTargetClass = true)
@Configuration
@MapperScan("${mybatis-plus.mapperPackage}")
public class MybatisPlusConfig {
@Bean
public MybatisPlusInterceptor mybatisPlusInterceptor() {
MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();
// 分页插件
interceptor.addInnerInterceptor(paginationInnerInterceptor());
// 乐观锁插件
interceptor.addInnerInterceptor(optimisticLockerInnerInterceptor());
return interceptor;
}
/**
* 分页插件，自动识别数据库类型
*/
public PaginationInnerInterceptor paginationInnerInterceptor() {
PaginationInnerInterceptor paginationInnerInterceptor = new PaginationInnerInterceptor();
// 设置数据库类型为mysql
paginationInnerInterceptor.setDbType(DbType.MYSQL);
// 设置最大单页限制数量，默认 500 条，-1 不受限制
paginationInnerInterceptor.setMaxLimit(-1L);
return paginationInnerInterceptor;
}
/**
* 乐观锁插件
*/
public OptimisticLockerInnerInterceptor optimisticLockerInnerInterceptor() {
return new OptimisticLockerInnerInterceptor();
}
/**
* 元对象字段填充控制器
*/
@Bean
public MetaObjectHandler metaObjectHandler() {
return new CreateAndUpdateMetaObjectHandler();
}
/**
* sql注入器配置
*/
@Bean
public MybatisPlusSqlInjector easySqlInjector () {
return new MybatisPlusSqlInjector();
}
}
还有两个是分页与查询方式可以自己定义
分页类需要继承 IPage，查询类可以继承 IService
开始测试
使用分页查询
@Override
public ServerResponse selectTableTestList(TableTestPOJO tableTest) {
// 分页查询 1 sql自己写 适用于多表
Page page = new Page<>(mutualStep.getPageNum(), mutualStep.getPageSize());
page = tableTestMapper.findTableList(page,new TableTest());
// 分页查询 2 对象筛选 适用单表 条件默认相等
QueryWrapper query = Wrappers.query();
query.like("name","ls");
query.and(
wrapper ->
wrapper.notLike("name","1").or().like("name","ls")
);
query.orderByDesc("id");
Page page = new Page<>(tableTest.getPageNum(), tableTest.getPageSize());
Page pageList = tableTestMapper.selectPage(page, query);
return ServerResponse.createBySuccess(pageList);
}
逻辑删除定义
/**
* 删除状态 0未删除，1删除
*/
@TableLogic(value = "0",delval = "1")
private Integer is_del;
逻辑删除
@Override
public ServerResponse deleteTableTest(MutualStepPage mutualStepPage, Integer... ids) {
int number = tableTestMapper.deleteBatchIds(Arrays.asList(ids));
return ServerResponse.createBySuccess(number);
}
以上为个人经验，希望能给大家一个参考，也希望大家多多支持脚本之家。