Simple getColumnName(0) call throws Invalid column

问题:

I'm trying to write a JTable that takes the data from a ResultSet and uses that to create a dynamic sized table with appropriate column names and row data values from the ResultSet but I can't get JDBC to get the column names for me dynamically.

I know my select statement is good! I can print the results out easily with my ResultPrinter class that I wrote but I can't seem to get the column names for some reason.

The code: http://pastebin.com/SSNdCkNu

The output:

Connected to DB!  
SNUM, SNAME, STATUS, CITY, SUPPLIERS_ID_SEQ // printed by static Suppliers class
Columns: 5 // result set shows there are 5 valid columns as expected
Exception in thread "main" java.sql.SQLException: Invalid column index: getValidColumnIndex
at oracle.jdbc.driver.OracleResultSetMetaData.getValidColumnIndex(OracleResultSetMetaData.java:138)
at oracle.jdbc.driver.OracleResultSetMetaData.getColumnName(OracleResultSetMetaData.java:306)
at Main.main(Main.java:15)

回答1:

JDBC column indexes start from 1 and not 0. As far as possible, it is better to retrieve data using column names to avoid hard dependency on the order of columns in the results.

回答2:

Column index starts by 1. So increase your variable pointing column variable by 1.