Get Table Optimal Set Of Columns : Column « Database SQL JDBC « Java






Get Table Optimal Set Of Columns

 
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')");

    DatabaseMetaData meta = conn.getMetaData();
    // The '_' character represents any single character.
    // The '%' character represents any sequence of zero
    // or more characters.
    ResultSet rs = meta.getBestRowIdentifier(conn.getCatalog(), null, "survey",
        DatabaseMetaData.bestRowTemporary, false);
    while (rs.next()) {

      short actualScope = rs.getShort("SCOPE");
      String columnName = rs.getString("COLUMN_NAME");
      int dataType = rs.getInt("DATA_TYPE");
      String typeName = rs.getString("TYPE_NAME");
      int columnSize = rs.getInt("COLUMN_SIZE");
      short decimalDigits = rs.getShort("DECIMAL_DIGITS");
      short pseudoColumn = rs.getShort("PSEUDO_COLUMN");

      System.out.println("tableName=survey");
      System.out.println("scope=" + actualScope);
      System.out.println("columnName=" + columnName);
      System.out.println("dataType=" + dataType);
      System.out.println("typeName" + typeName);
      System.out.println("columnSize" + columnSize);
      System.out.println("decimalDigits" + decimalDigits);
      System.out.println("pseudoColumn" + pseudoColumn);
    }

    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;
  }

}


           
         
  








GetTableOptimalSetOfColumns.zip( 2,517 k)

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