How to Get Index Infomation

package example.jdbc.index;
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
 
public class Main1 {
    public static void main(String[] args) throws Exception {
	Connection conn = getMySqlConnection();
	System.out.println("Got Connection.");
	Statement st = conn.createStatement();
	st.executeUpdate("drop table survey;");
	st.executeUpdate("create table survey (id int,name varchar(30));");
	st.executeUpdate("insert into survey (id,name ) values (1,'nameValue')");
 
	ResultSet indexInformation = null;
	DatabaseMetaData meta = conn.getMetaData();
 
	// The '_' character represents any single character.
	// The '%' character represents any sequence of zero
	// or more characters.
	indexInformation = meta.getIndexInfo(conn.getCatalog(), null, "survey", true, true);
	while (indexInformation.next()) {
	    String dbCatalog = indexInformation.getString("TABLE_CATALOG");
	    String dbSchema = indexInformation.getString("TABLE_SCHEMA");
	    String dbTableName = indexInformation.getString("TABLE_NAME");
	    boolean dbNoneUnique = indexInformation.getBoolean("NON_UNIQUE");
	    String dbIndexQualifier = indexInformation.getString("INDEX_QUALIFIER");
	    String dbIndexName = indexInformation.getString("INDEX_NAME");
	    short dbType = indexInformation.getShort("TYPE");
	    short dbOrdinalPosition = indexInformation.getShort("ORDINAL_POSITION");
	    String dbColumnName = indexInformation.getString("COLUMN_NAME");
	    String dbAscOrDesc = indexInformation.getString("ASC_OR_DESC");
	    int dbCardinality = indexInformation.getInt("CARDINALITY");
	    int dbPages = indexInformation.getInt("PAGES");
	    String dbFilterCondition = indexInformation.getString("FILTER_CONDITION");
 
	    System.out.println("index name=" + dbIndexName);
	    System.out.println("table=" + dbTableName);
	    System.out.println("column=" + dbColumnName);
	    System.out.println("catalog=" + dbCatalog);
	    System.out.println("schema=" + dbSchema);
	    System.out.println("nonUnique=" + dbNoneUnique);
	    System.out.println("indexQualifier=" + dbIndexQualifier);
	    System.out.println("type=" + dbType);
	    System.out.println("ordinalPosition=" + dbOrdinalPosition);
	    System.out.println("ascendingOrDescending=" + dbAscOrDesc);
	    System.out.println("cardinality=" + dbCardinality);
	    System.out.println("pages=" + dbPages);
	    System.out.println("filterCondition=" + dbFilterCondition);
	}
 
	st.close();
	conn.close();
    }
 
    private static Connection getHSQLConnection() throws Exception {
	Class.forName("org.hsqldb.jdbcDriver");
	System.out.println("Driver Loaded.");
	String url = "jdbc:hsqldb:data/tutorial";
	return DriverManager.getConnection(url, "sa", "");
    }
 
    public static Connection getMySqlConnection() throws Exception {
	String driver = "org.gjt.mm.mysql.Driver";
	String url = "jdbc:mysql://localhost/demo2s";
	String username = "oost";
	String password = "oost";
 
	Class.forName(driver);
	Connection conn = DriverManager.getConnection(url, username, password);
	return conn;
    }
 
    public static Connection getOracleConnection() throws Exception {
	String driver = "oracle.jdbc.driver.OracleDriver";
	String url = "jdbc:oracle:thin:@localhost:1521:caspian";
	String username = "mp";
	String password = "mp2";
 
	Class.forName(driver); // load Oracle driver
	Connection conn = DriverManager.getConnection(url, username, password);
	return conn;
    }
}