Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
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')");

        st = conn.createStatement();
        ResultSet rs = st.executeQuery("SELECT * FROM survey");

        ResultSetMetaData rsMetaData = rs.getMetaData();

        int numberOfColumns = rsMetaData.getColumnCount();
        System.out.println("resultSet MetaData column Count=" + numberOfColumns);

        for (int i = 1; i <= numberOfColumns; i++) {
            System.out.println("column MetaData ");
            System.out.println("column number " + i);
            // indicates the designated column's normal maximum width in
            // characters
            System.out.println(rsMetaData.getColumnDisplaySize(i));
            // gets the designated column's suggested title
            // for use in printouts and displays.
            System.out.println(rsMetaData.getColumnLabel(i));
            // get the designated column's name.
            System.out.println(rsMetaData.getColumnName(i));

            // get the designated column's SQL type.
            System.out.println(rsMetaData.getColumnType(i));

            // get the designated column's SQL type name.
            System.out.println(rsMetaData.getColumnTypeName(i));

            // get the designated column's class name.
            System.out.println(rsMetaData.getColumnClassName(i));

            // get the designated column's table name.
            System.out.println(rsMetaData.getTableName(i));

            // get the designated column's number of decimal digits.
            System.out.println(rsMetaData.getPrecision(i));

            // gets the designated column's number of
            // digits to right of the decimal point.
            System.out.println(rsMetaData.getScale(i));

            // indicates whether the designated column is
            // automatically numbered, thus read-only.
            System.out.println(rsMetaData.isAutoIncrement(i));

            // indicates whether the designated column is a cash value.
            System.out.println(rsMetaData.isCurrency(i));

            // indicates whether a write on the designated
            // column will succeed.
            System.out.println(rsMetaData.isWritable(i));

            // indicates whether a write on the designated
            // column will definitely succeed.
            System.out.println(rsMetaData.isDefinitelyWritable(i));

            // indicates the nullability of values
            // in the designated column.
            System.out.println(rsMetaData.isNullable(i));

            // Indicates whether the designated column
            // is definitely not writable.
            System.out.println(rsMetaData.isReadOnly(i));

            // Indicates whether a column's case matters
            // in the designated column.
            System.out.println(rsMetaData.isCaseSensitive(i));

            // Indicates whether a column's case matters
            // in the designated column.
            System.out.println(rsMetaData.isSearchable(i));

            // indicates whether values in the designated
            // column are signed numbers.
            System.out.println(rsMetaData.isSigned(i));

            // Gets the designated column's table's catalog name.
            System.out.println(rsMetaData.getCatalogName(i));

            // Gets the designated column's table's schema name.
            System.out.println(rsMetaData.getSchemaName(i));
        }

        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;
    }
}