How to Retrieve Column Names from a java.sql.ResultSet?

Retrieving Column Names from java.sql.ResultSet

Querying a database often involves retrieving data and manipulating columns within the resulting dataset. When working with a java.sql.ResultSet, there may arise a need to access column names as strings using their respective indexes.

To obtain column names using their indexes, you can utilize the ResultSetMetaData class. This class represents metadata about the columns in a ResultSet. By calling ResultSet.getMetaData(), you can obtain the metadata object.

Here's how you can retrieve column names using ResultSetMetaData:

ResultSet rs = stmt.executeQuery("SELECT a, b, c FROM TABLE2");
ResultSetMetaData rsmd = rs.getMetaData();
String name = rsmd.getColumnName(1);

The getColumnName() method takes the column index as an argument (starting from 1) and returns the corresponding column name as a string.

For example, if you execute a query that retrieves alias column names, such as:

select x as y from table

Calling rsmd.getColumnLabel() will also return the column label name.

This approach allows you to access column names programmatically, which can be useful for dynamic operations or when working with unknown or changing column structures.

The above is the detailed content of How to Retrieve Column Names from a java.sql.ResultSet?. For more information, please follow other related articles on the PHP Chinese website!