📅  最后修改于: 2022-03-11 14:59:57.688000             🧑  作者: Mango
It is used for to get column information not the actual data of column
Common methods are getColumnCount and getColumnLabel
//ResultSetMetaData itself does not contains any row data
ResultSetMetaData rsmd = rs.getMetaData();
// Metadata -- data about the data
// ResultSetMetaData -- data about the ResultSet object that
contain our resulting rows and columns
// for example column names, column counts .. and more