Java/Database SQL JDBC/Key

Demo Get Generated Keys MySQL

   <source lang="java">

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();
     }
   }
 }

}

      </source>
   
  
 
  

Get Foreign Keys

   <source lang="java">

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;
 }

}

      </source>
   
  
 
  

Get Imported Keys

   <source lang="java">

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;
 }

}

      </source>
   
  
 
  

Get Primary Key Column From A Table

   <source lang="java">

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;
 }

}

      </source>