mybatisplus添加真正的批量新增、批量更新的实现

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 = "<script>insert into %s %s values %s</script>";
    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("</foreach>");
    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 = "<script>\n<foreach collection=\"list\" item=\"item\" separator=\";\">\nupdate %s %s where %s=#{%s} %s\n</foreach>\n</script>";
    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<AbstractMethod> getMethodList(Class<?> mapperClass) {
    List<AbstractMethod> 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<T> extends BaseMapper<T> {

  /**
   * 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<T> 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<T> list);
}

5.如何使用

@Repository
public interface UserInfoMapper extends RootMapper<UserInfo> {
} 

public interface UserInfoService extends IService<UserInfo> {
  int saveAll();
  int updateAll();
}

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

  @Override
  public 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);
  }

  @Override
  public 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);
  }
}

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