Java/Database SQL JDBC/Key

Demo Get Generated Keys MySQL

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;
public class DemoGetGeneratedKeysMySQL {
  public static Connection getConnection() throws Exception {
    String driver = "org.gjt.mm.mysql.Driver";
    String url = "jdbc:mysql://localhost/databaseName";
    String username = "root";
    String password = "root";
    Class.forName(driver);
    Connection conn = DriverManager.getConnection(url, username, password);
    return conn;
  }
  public static void main(String[] args)throws Exception {
    Connection conn = getConnection();
    Statement stmt = null;
    ResultSet rs = null;
    try {
      conn = getConnection();
      stmt = conn.createStatement();
      stmt.executeUpdate("insert into animals_table (name) values("newName")");
      rs = stmt.getGeneratedKeys();
      while (rs.next()) {
        ResultSetMetaData rsMetaData = rs.getMetaData();
        int columnCount = rsMetaData.getColumnCount();
        for (int i = 1; i <= columnCount; i++) {
          String key = rs.getString(i);
          System.out.println("key " + i + " is " + key);
        }
      }
    } catch (Exception e) {
      e.printStackTrace();
      System.exit(1);
    } finally {
      try {
        rs.close();
        stmt.close();
        conn.close();
      } catch (SQLException e) {
        e.printStackTrace();
      }
    }
  }
}

Get Foreign Keys

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 = 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 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.getExportedKeys(conn.getCatalog(), null, "survey");
     while (rs.next()) {
       String fkTableName = rs.getString("FKTABLE_NAME");
       String fkColumnName = rs.getString("FKCOLUMN_NAME");
       int fkSequence = rs.getInt("KEY_SEQ");
       System.out.println("getExportedKeys(): fkTableName="+fkTableName);
       System.out.println("getExportedKeys(): fkColumnName="+fkColumnName);
       System.out.println("getExportedKeys(): fkSequence="+fkSequence);
     }
    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;
  }
}

Get Imported Keys

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 = 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 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.getImportedKeys(conn.getCatalog(), null, "survey");
     while (rs.next()) {
       String fkTableName = rs.getString("FKTABLE_NAME");
       String fkColumnName = rs.getString("FKCOLUMN_NAME");
       int fkSequence = rs.getInt("KEY_SEQ");
       System.out.println("getExportedKeys(): fkTableName="+fkTableName);
       System.out.println("getExportedKeys(): fkColumnName="+fkColumnName);
       System.out.println("getExportedKeys(): fkSequence="+fkSequence);
     }
    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;
  }
}

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;
  }
}