Get Primary Key Column From A Table
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
public class Main {
public static void main(String[] args) throws Exception {
Connection conn = getHSQLConnection();
System.out.println("Got Connection.");
Statement st = conn.createStatement();
st.executeUpdate("create table survey (id int,name varchar, PRIMARY KEY (id) );");
st.executeUpdate("insert into survey (id,name ) values (1,'nameValue')");
ResultSet rs = null;
DatabaseMetaData meta = conn.getMetaData();
// The Oracle database stores its table names as Upper-Case,
// if you pass a table name in lowercase characters, it will not work.
// MySQL database does not care if table name is uppercase/lowercase.
//
rs = meta.getPrimaryKeys(null, null, "survey");
java.util.List list = new java.util.ArrayList();
while (rs.next()) {
String columnName = rs.getString("COLUMN_NAME");
System.out.println("getPrimaryKeys(): columnName=" + columnName);
}
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/octopus";
String username = "root";
String password = "root";
Class.forName(driver); // load MySQL 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;
}
}
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