如何使用 Spring 进行自定义查询 CrudRepository 使用两个或多个具有存储库的实体

Question

我有三个实体和一个存储库扩展了 CrudRepository，我想进行下一个查询，但我做不到。我在 upper 中或附近有语法错误。我认为问题是在查询中使用了多个表 and/or 我没有在实体中使用任何标记或声明。

import java.util.List;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.CrudRepository;
import org.springframework.data.repository.query.Param;
import com.companyname.springapp.business.entities.TableA;

public interface TableARepository extends CrudRepository<TableA, Integer>{

@Query(value = "SELECT DISTINCT a.*"
            +"FROM TableB AS b, TableA_TableB AS ab, TableA AS a"
            +"WHERE upper(b.nick_name) like upper(concat('%',:name,'%'))"
            +"AND b.nick_name_id=ab.nick_name_id"
            +"AND ab.id=a.id", 
              nativeQuery = true)
            List<tableA> test(
              @Param("name") String name);

我的实体：

表A

import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;

import com.companyname.springapp.web.Views;
import com.fasterxml.jackson.annotation.JsonView;


@Entity
@Table(name="TableA")
public class TableA{

    @Id
    @JsonView(Views.Public.class)
    private Integer id;

    //more columns, constructs and getters and setters

表B

    //... imports
    @Entity
    @Table(name="TableB")
    public class TableB{

    @Id
    @JsonView(Views.Public.class)
    private Integer nick_name_id;

    @JsonView(Views.Public.class)
    private String nick_name;

    //more columns, constructs and getters and setters

TableA_TableB

    //... imports
    @Entity
    @Table(name="TableA_TableB")
    public class TableA_TableB{

    @Id
    @JsonView(Views.Public.class)
    private Integer id;

    @JsonView(Views.Public.class)
    private Integer nick_name_id;

    //more columns, constructs and getters and setters

我有 TableAManager

import java.util.List;

import com.companyname.springapp.business.entities.TableA;

public interface TableAManager {

    public List<TableA> test(String name);
}

实现 JPATableAManager

import java.util.ArrayList;
import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.companyname.springapp.business.entities.TableA;
import com.companyname.springapp.business.repositories.TableARepository;

@Service
public class JPATableAManager implements TableAManager {

    @Autowired
    private TableARepository tableARepository;

    public List<TableA> getTableA() {
        return (List<TableA>) tableARepository.test();
    }

PD：请原谅我的英语

Answer 1

您的 SQL 语句丢失 spaces.

"SELECT DISTINCT a.*"
+"FROM TableB AS b, TableA_TableB AS ab, TableA AS a"
+"WHERE upper(b.nick_name) like upper(concat('%',:name,'%'))"
+"AND b.nick_name_id=ab.nick_name_id"
+"AND ab.id=a.id"

当连接起来时 "SELECT DISTINCT a.*FROM TableB AS b, TableA_TableB AS ab, TableA AS aWHERE upper(b.nick_name) like upper(concat('%',:name,'%'))AND b.nick_name_id=ab.nick_name_idAND ab.id=a.id"

这会导致 aWhere 成为 TableA 的别名，而 where 子句不会被这样解析。

以这种方式构造 SQL 语句时，每行以 space:

结尾

"SELECT DISTINCT a.* "
+"FROM TableB AS b, TableA_TableB AS ab, TableA AS a "
+"WHERE upper(b.nick_name) like upper(concat('%',:name,'%')) "
+"AND b.nick_name_id=ab.nick_name_id "
+"AND ab.id=a.id"

如何使用 Spring 进行自定义查询 CrudRepository 使用两个或多个具有存储库的实体

How to make a custom query with Spring CrudRepository employ two or more entities with a repository

sql

spring

spring-mvc

spring-data-jpa

spring-repositories