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 injector.AbstractMethod;
import adata.TableInfo;
slf4j.Slf4j;
import org.utor.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, TableName(), fieldSql, valueSql);
//log.debug("sqlResult----->{}", sqlResult);
SqlSource sqlSource = ateSqlSource(configuration, sqlResult, modelClass);
return this.addInsertMappedStatement(mapperClass, modelClass, "insertBatch", sqlSource, new NoKeyGenerator(), null, null);
}
private String prepareFieldSql(TableInfo tableInfo) {
StringBuilder fieldSql = new StringBuilder();
fieldSql.KeyColumn()).append(",");
fieldSql.delete(fieldSql.length() - 1, fieldSql.length());
fieldSql.insert(0, "(");
fieldSql.append(")");
String();
}
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.").KeyProperty()).append("},");
valueSql.delete(valueSql.length() - 1, valueSql.length());
valueSql.append("</foreach>");
String();
}
}
import injector.AbstractMethod;
import adata.TableInfo;
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() ? VersionFieldInfo().getVersionOli("item", "item.") : "" + LogicDeleteSql(true, true);    String setSql = sqlSet(tableInfo.isWithLogicDelete(), false, tableInfo, false, "item", "item.");
String sqlResult = String.format(sql, TableName(), setSql, KeyColumn(), "item." + KeyProperty(), additional);
//log.debug("sqlResult----->{}", sqlResult);
SqlSource sqlSource = ateSqlSource(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 injector.AbstractMethod;
import 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MethodList()，再添加add
*/
@Override
public List<AbstractMethod> getMethodList(Class<?> mapperClass) {
List<AbstractMethod> methodList = MethodList(mapperClass);
methodList.add(new InsertBatchMethod());
methodList.add(new UpdateBatchMethod());
return methodList;
}
}
3.注⼊配置
@MapperScan("apper")
@Configuration
public class MyBatisPlusConfig {
@Bean
public CustomizedSqlInjector customizedSqlInjector() {
return new CustomizedSqlInjector();
}
}
4.添加通⽤mapper
import apper.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 apper.BaseMapper}
* {@link sion.service.IService}
* {@link sion.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);
}
批量更新sql语句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" + Salt()));
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);
}
}
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！

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