Get Foreign Keys : Key « Database SQL JDBC « Java





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;
  }
}

           
       










GetForeignKeys.zip( 3,848 k)

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