关于SSH多表联查sql语句中jion和Path expected for join!的问题！
我的查询总共四个表:发票总表IV_Invoice 入库表IV_InInvoice 出库表IV_OutInvoice 交票表IV_Archive，然后对应关系就省略了。。。关系搭建的是没有任何问题的...直接看查询代码
//查询总表IV_InvoiceVo这个类是我查的所有数据封装类
public List findall() {
// TODO Auto-generated method stub
System.out.println("查询总表daoimpl进来了。。。。");
List list=getSession().createQuery("select new com.ssh.entity.IV_InvoiceVo(a.InvoiceType,b.StartNo,b.EndNo,b.Counts AS Sums,c.Counts,(b.Counts-c.Counts)AS Wsum,(SELECT COUNT(*) FROM IV_Invoice WHERE Used=1)AS Used,(SELECT COUNT(*) FROM IV_Invoice WHERE Invalid=1)AS Invalid,(d.counts) AS Archived,(c.Counts-d.counts)AS Wjcount,b.InDate) FROM IV_Invoice AS a inner JOIN IV_INInvoice AS b ON a.InInvoiceID=b.InInvoiceID inner JOIN IV_OutInvoice AS c ON b.InInvoiceID=c.InInvoiceID inner JOIN iv_archive AS d ON d.InInvoiceID=a.InInvoiceID").list();
return list;
} 然后看IV_InvoiceVo类中类型（这个类是我把4张表所查的数据封装在里边了 就是查询语句as 的那些别名那些）
package com.ssh.entity;
import java.util.Date;
public class IV_InvoiceVo {
private int InvoiceType;//发票类型
private String StartNo;//开始号码
private String EndNo;//结束号码
private int Sums;//总张数
private int Counts;//出库数
private int Wsum;//未出数
private int Used;//已用
private int Invalid;//作废
private int Archived;//已交
private int Wjcount;//未交
private Date InDate;//入库时间
//private String EmpName;//入库人
public IV_InvoiceVo() {
}
//...省略构造方法
}jsp页面代码使用的s标签页面过于太长剪短至循环
发票类型
起始号码
终止号码
总张数
出库数
未出数
已用数
作废数
待用数
已交数
未交数
入库日期
入库操作员
普通发票
增值税发票
${session.empName}
然后再看报错
08:51:09.068 [http-nio-8080-exec-3] ERROR org.hibernate.hql.internal.ast.ErrorCounter - Invalid path: 'b.StartNo'
org.hibernate.hql.internal.ast.InvalidPathException: Invalid path: 'b.StartNo'
----
----
----
08:51:09.079 [http-nio-8080-exec-3] ERROR org.hibernate.hql.internal.ast.ErrorCounter - Invalid path: 'b.Counts'
org.hibernate.hql.internal.ast.InvalidPathException: Invalid path: 'b.Counts'
----
----
----
08:51:09.080 [http-nio-8080-exec-3] ERROR org.hibernate.hql.internal.ast.ErrorCounter - :0:0: unexpected end of subtree
antlr.NoViableAltException: unexpected end of subtree
它说我这个b别名没有但是我在数据库中实现这条查询语句是可以执行的
select a.InvoiceType,b.StartNo,b.EndNo,b.Counts AS Sums,c.Counts,(b.Counts-c.Counts)AS Wsum,(SELECT COUNT(*) FROM IV_Invoice WHERE Used=1)AS Used,(SELECT COUNT(*) FROM IV_Invoice WHERE Invalid=1)AS Invalid,(d.counts) AS Archived,(c.Counts-d.counts)AS Wjcount,b.InDate,e.EmpName FROM IV_Invoice AS a inner JOIN IV_INInvoice AS b ON a.InInvoiceID=b.InInvoiceID inner JOIN IV_OutInvoice AS c ON b.InInvoiceID=c.InInvoiceID inner JOIN iv_archive AS d ON d.InInvoiceID=a.InInvoiceID inner JOIN SY_Emp AS e ON a.Empid=e.Empid
然后报那个Bug我仔细改又是找的，然后终于不报这个错了但是又换了一个错mmp...
Path expected for join!然后我百度了看了这个博主的https://blog.csdn.net/sinat_36707441/article/details/79421313
说hql不支持join语法。
我的查询语句他是自动生成的，自动生成的语句不太能写编写复杂的，我也不确定。。。。
后面我继续弄，终于解决了这个问题...
1:实体类类型转换定义错了，定义的别名要用long型去封装。有些可能也不一样...
private long Used;//已用
private long Invalid;//作废//查询总表
public List findall() {
// TODO Auto-generated method stub
//System.out.println("查询总表daoimpl进来了。。。。");
List list=getSession().createQuery("select new com.ssh.entity.IV_InvoiceVo(a.InvoiceType,b.StartNo,b.EndNo,b.Counts as Sums,c.Counts,(b.Counts-c.Counts)as Wsum,(SELECT COUNT(*) FROM IV_Invoice WHERE Used=1)as Used,(SELECT COUNT(*) FROM IV_Invoice WHERE Invalid=1)as Invalid,(d.Counts) as Archived,(c.Counts-d.Counts)as Wjcount,b.InDate) FROM IV_Invoice a,IV_InInvoice b inner JOIN IV_OutInvoice AS c ON b.InInvoiceID=c.InInvoiceID inner JOIN IV_Archive AS d ON d.InInvoiceID=a.InInvoiceID and a.InInvoiceID=b.InInvoiceID ").list();
return list;
} 2:关于你建了关系的表要联合起来。:
列如：FROM IV_Invoice a,IV_InInvoice b and a.id=b.id inner join.......
然后还有就是你搭建的关系可能像我这个一样empid在实体类中改为对象了，然后我把它删了，自己
放session里调
// private String EmpName;//入库操作人3:没有解决不了Bug！
事实证明自动生成sql还是可以编译复杂点的语句。。
总结Bug解决方法
1.hql的join不支持没使用外键连接的不同表查询
2.查询语句是你的实体类名称不是数据库里的
3.搭建关系的表要联合
4.实体类里面的你定义的类型要跟sql一样
5.还有就是你多方关系可以选择像我一样session调。哈哈哈