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
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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();
}
}
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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);
}
}
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2.添加自定义方法SQL注入器
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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;
}
}
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3.注入配置
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@MapperScan("com.xxx.mapper")
@Configuration
public class MyBatisPlusConfig {
@Bean
public CustomizedSqlInjector customizedSqlInjector() {
return new CustomizedSqlInjector();
}
}
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4.添加通用mapper
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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);
}
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5.如何使用
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@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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到此这篇关于mybatisplus添加真正的批量新增、批量更新的实现的文章就介绍到这了,更多相关mybatisplus批量新增、批量更新内容请搜索快网idc以前的文章或继续浏览下面的相关文章希望大家以后多多支持快网idc！
原文链接：https://blog.csdn.net/qq_18432653/article/details/110875608
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