我可以在联接选择查询表单ResultSetMetaData中获取表名吗

Question

Can I get table name from

ResultSetMetaData

query is join of multiple tables

example

select * from table1 , table 2

when I am going to try to retrieve table name from

 ResultSetMetaData  

I always founds empty value.

Note : I am using informix driver

Answer 1

Based on the Informix JDBC Guide , the driver is unable to retrieve the tablename if the query accesses more than one table and will return a single space instead:

ResultSetMetaData.getTableName()

Returns the table name for SELECT , INSERT , and UPDATE statements

SELECT statements with more than one table name and all other statements return a String object containing one blank space.

From: Unsupported methods and methods that behave differently

Answer 2

You should use it together with column number parameter, so try something like

String table1 = rs.getMetaData().getTableName(someColumnNumberFromFirstTable);    
String table2 = rs.getMetaData().getTableName(someColumnNumberFromSecondTable);

Also see the docs .