mybatisplus添加真正的批量新增、批量更新

使用mybatis-plus来进行批量新增和更新时，你会发现其实是一条条sql执行,下面进行优化。

1.添加InsertBatchMethod和UpdateBatchMethod类

import com.baomidou.mybatisplus.core.injector.AbstractMethod; import com.baomidou.mybatisplus.core.metadata.TableInfo; import lombok.extern.slf4j.Slf4j; import org.apache.ibatis.executor.keygen.NoKeyGenerator; import org.apache.ibatis.mapping.MappedStatement; import org.apache.ibatis.mapping.SqlSource;

/**

• 批量插入方法实现 */ @Slf4j public class InsertBatchMethod extends AbstractMethod { @Override public MappedStatement injectMappedStatement(Class mapperClass, Class modelClass, TableInfo tableInfo) { final String sql = ""; final String fieldSql = prepareFieldSql(tableInfo); final String valueSql = prepareValuesSql(tableInfo); final String sqlResult = String.format(sql, tableInfo.getTableName(), fieldSql, valueSql); //log.debug("sqlResult----->{}", sqlResult); SqlSource sqlSource = languageDriver.createSqlSource(configuration, sqlResult, modelClass); return this.addInsertMappedStatement(mapperClass, modelClass, "insertBatch", sqlSource, new NoKeyGenerator(), null, null); }private String prepareFieldSql(TableInfo tableInfo) { StringBuilder fieldSql = new StringBuilder(); fieldSql.append(tableInfo.getKeyColumn()).append(","); tableInfo.getFieldList().forEach(x -> fieldSql.append(x.getColumn()).append(",")); fieldSql.delete(fieldSql.length() - 1, fieldSql.length()); fieldSql.insert(0, "("); fieldSql.append(")"); return fieldSql.toString(); }private String prepareValuesSql(TableInfo tableInfo) { final StringBuilder valueSql = new StringBuilder(); valueSql.append("<foreach collection=\"list\" item=\"item\" index=\"index\" open=\"(\" separator=\"),(\" close=\")\">"); valueSql.append("#{item.").append(tableInfo.getKeyProperty()).append("},"); tableInfo.getFieldList().forEach(x -> valueSql.append("#{item.").append(x.getProperty()).append("},")); valueSql.delete(valueSql.length() - 1, valueSql.length()); valueSql.append(""); return valueSql.toString(); } }

import com.baomidou.mybatisplus.core.injector.AbstractMethod; import com.baomidou.mybatisplus.core.metadata.TableInfo; import lombok.extern.slf4j.Slf4j; import org.apache.ibatis.mapping.MappedStatement; import org.apache.ibatis.mapping.SqlSource;

/**

• 批量更新方法实现，条件为主键，选择性更新 */ @Slf4j public class UpdateBatchMethod 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); ​​//log.debug​​("sqlResult----->{}", sqlResult); SqlSource sqlSource = languageDriver.createSqlSource(configuration, sqlResult, modelClass); // 第三个参数必须和RootMapper的自定义方法名一致 return this.addUpdateMappedStatement(mapperClass, modelClass, "updateBatch", sqlSource); }

}

2.添加自定义方法SQL注入器

import com.baomidou.mybatisplus.core.injector.AbstractMethod; import com.baomidou.mybatisplus.core.injector.DefaultSqlInjector;

import java.util.List;

public class CustomizedSqlInjector extends DefaultSqlInjector { /** * 如果只需增加方法，保留mybatis plus自带方法， * 可以先获取super.getMethodList()，再添加add */ @Override public List methodList = super.getMethodList(mapperClass); methodList.add(new InsertBatchMethod()); methodList.add(new UpdateBatchMethod()); return methodList; } }

3.注入配置

@MapperScan("com.xxx.mapper") @Configuration public class MyBatisPlusConfig { @Bean public CustomizedSqlInjector customizedSqlInjector() { return new CustomizedSqlInjector(); } }

4.添加通用mapper

import com.baomidou.mybatisplus.core.mapper.BaseMapper; import org.apache.ibatis.annotations.Param;

import java.util.List;

/**

• 根Mapper，给表Mapper继承用的，可以自定义通用方法
• {@link com.baomidou.mybatisplus.core.mapper.BaseMapper}
• {@link com.baomidou.mybatisplus.extension.service.IService}
• {@link com.baomidou.mybatisplus.extension.service.impl.ServiceImpl} */ public interface RootMapper {/**

• 自定义批量插入
• 如果要自动填充，@Param(xx) xx参数名必须是 list/collection/array 3个的其中之一 */ int insertBatch(@Param("list") List list);

/**

• 自定义批量更新，条件为主键
• 如果要自动填充，@Param(xx) xx参数名必须是 list/collection/array 3个的其中之一 */ int updateBatch(@Param("list") List list); }

5.如何使用

@Repository public interface UserInfoMapper extends RootMapper { }

public interface UserInfoService extends IService {

int saveAll();int updateAll();

}

@Service public class UserInfoServiceImpl extends ServiceImpl<UserInfoMapper, UserInfo> implements UserInfoService{

@Overridepublic int saveAll() { List<UserInfo> list = new ArrayList<>(); for (int i = 0; i < 20; i++) { UserInfo userInfo = new UserInfo(); userInfo.setUserName("厉害" + i); userInfo.setSalt(RandomStringUtils.randomAlphabetic(6)); userInfo.setPassword(SecureUtil.sha256("123456" + userInfo.getSalt())); userInfo.setSex(0); userInfo.setAvatar(LoginServiceImpl.AVATAR); list.add(userInfo); } return baseMapper.insertBatch(list);}@Overridepublic int updateAll() { List<UserInfo> userInfos = baseMapper.selectList(Wrappers.<UserInfo>lambdaQuery().between(BaseEntity::getId, 43, 62)); userInfos.forEach(userInfo -> { userInfo.setUserName("更新了" + IdUtil.simpleUUID()); }); return baseMapper.updateBatch(userInfos);}

}

MyBatis-plus是一款MyBatis的增强工具，在MyBatis 的基础上只做增强不做改变。其是国内团队苞米豆在MyBatis基础上开发的增强框架，扩展了一些功能，以提高效率。引入 Mybatis-Plus 不会对现有的 Mybatis 构架产生任何影响，而且 MyBatis-plus 支持所有 Mybatis 原生的特性

———————————————— 原文链接：​​https://blog.csdn.net/qq_18432653/article/details/110875608​​