为什么由于无效列而导致对Oracle表ALL_TAB_COLUMNS的本地查询失败？

问题描述

为什么在Spring Boot休眠Invalid column name中出现此错误createNativeQuery？我正在尝试从oracle数据库获取表信息。我把我的查询放在db eaver中成功了，请告诉我本地查询的最佳做法是什么...

Hibernate: SELECT TABLE_NAME,COLUMN_NAME,DATA_TYPE FROM ALL_TAB_COLUMNS WHERE TABLE_NAME='BPN_AKTA'
2020-09-25 10:27:53.005  WARN 60208 --- [nio-8080-exec-2] o.h.engine.jdbc.spi.sqlExceptionHelper   : sql Error: 17006,sqlState: 99999
2020-09-25 10:27:53.005 ERROR 60208 --- [nio-8080-exec-2] o.h.engine.jdbc.spi.sqlExceptionHelper   : Invalid column name
2020-09-25 10:27:53.006 ERROR 60208 --- [nio-8080-exec-2] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing Failed; nested exception is javax.persistence.PersistenceException: org.hibernate.exception.GenericJDBCException: Could not execute query] with root cause

java.sql.sqlException: Invalid column name

Query q= em.createNativeQuery("SELECT TABLE_NAME,DATA_TYPE FROM ALL_TAB_COLUMNS WHERE TABLE_NAME='PC'",QueryTableAttModel.class);
List<QueryTableAttModel> tableColl =  q.getResultList();

我的模特

@Entity(name="ALL_TAB_COLUMNS")
public class QueryTableAttModel {

    public String getTABLE_NAME() {
        return TABLE_NAME;
    }

    public void setTABLE_NAME(String TABLE_NAME) {
        this.TABLE_NAME = TABLE_NAME;
    }


    public String getCOLUMN_NAME() {
        return COLUMN_NAME;
    }

    public void setCOLUMN_NAME(String COLUMN_NAME) {
        this.COLUMN_NAME = COLUMN_NAME;
    }


    public String getDATA_TYPE() {
        return DATA_TYPE;
    }

    public void setDATA_TYPE(String DATA_TYPE) {
        this.DATA_TYPE = DATA_TYPE;
    }

    private String TABLE_NAME;
    private String COLUMN_NAME;
    private String DATA_TYPE;
    private String id;

    @Id
    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }
}

解决方法

问题是表ALL_TAB_COLUMNS没有单列主键。您应该基于OWNER，TABLE_NAME，COLUMN_NAME列使用复合主键。

例如，您可以将@IdClass annotation用于复合主键映射：

@Entity
@Table(name = "ALL_TAB_COLUMNS")
@IdClass(QueryTableAttModelPK.class)
public class QueryTableAttModel
{
   private String owner;
   private String tableName;
   private String columnName;
   private String dataType;
   
   public QueryTableAttModel()
   {
   }
   
   @Id
   @Column(name = "OWNER")
   public String getOwner()
   {
      return owner;
   }
   public void setOwner(String owner)
   {
      this.owner = owner;
   }

   @Id
   @Column(name = "TABLE_NAME")
   public String getTableName()
   {
      return tableName;
   }
   public void setTableName(String tableName)
   {
      this.tableName = tableName;
   }

   @Id
   @Column(name = "COLUMN_NAME")
   public String getColumnName()
   {
      return columnName;
   }
   public void setColumnName(String columnName)
   {
      this.columnName = columnName;
   }

   @Column(name = "DATA_TYPE")
   public String getDataType()
   {
      return dataType;
   }
   public void setDataType(String dataType)
   {
      this.dataType = dataType;
   }
}

QueryTableAttModelPK类在哪里

import java.io.Serializable;
import java.util.Objects;

public class QueryTableAttModelPK implements Serializable
{
   private String owner;
   private String tableName;
   private String columnName;
   
   public QueryTableAttModelPK()
   {
   }
   
   public QueryTableAttModelPK(String owner,String tableName,String columnName)
   {
      this.owner = owner;
      this.tableName = tableName;
      this.columnName = columnName;
   }

   public String getOwner()
   {
      return owner;
   }
   public void setOwner(String owner)
   {
      this.owner = owner;
   }

   public String getTableName()
   {
      return tableName;
   }
   public void setTableName(String tableName)
   {
      this.tableName = tableName;
   }

   public String getColumnName()
   {
      return columnName;
   }
   public void setColumnName(String columnName)
   {
      this.columnName = columnName;
   }
   
   @Override
   public boolean equals(Object obj) {
      if (this == obj) return true;
      if (obj == null) return false;
      if (getClass() != obj.getClass()) return false;
      
      QueryTableAttModelPK other = (QueryTableAttModelPK) obj;
      return Objects.equals(owner,other.owner) 
          && Objects.equals(tableName,other.tableName)
          && Objects.equals(columnName,other.columnName);
   }

   @Override
   public int hashCode() {
      return Objects.hash(owner,tableName,columnName);
   }
}

然后可以使用本机查询：

List<QueryTableAttModel> results = em.createNativeQuery(
   "select OWNER,TABLE_NAME,COLUMN_NAME,DATA_TYPE from ALL_TAB_COLUMNS where TABLE_NAME = :table",QueryTableAttModel.class)
.setParameter("table","ALL_TAB_COLUMNS")
.getResultList();

一个jpql / hql查询：

List<QueryTableAttModel> results = em.createQuery(
   "select q from QueryTableAttModel q where q.tableName = :table","ALL_TAB_COLUMNS")
.getResultList();

或通过PK查找实体

QueryTableAttModel qTable = em.find(
   QueryTableAttModel.class,new QueryTableAttModelPK("SYS","ALL_TAB_COLUMNS","CHAR_LENGTH")
);