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.ParameterMetaData;
import java.sql.PreparedStatement;
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);");
        st.executeUpdate("create view surveyView as (select * from survey);");
        st.executeUpdate("insert into survey (id,name ) values (1,'nameValue')");

        PreparedStatement pstmt = null;
        ParameterMetaData paramMetaData = null;
        String query = "select * from survey where id > ? and name = ?";
        pstmt = conn.prepareStatement(query);
        paramMetaData = pstmt.getParameterMetaData();
        if (paramMetaData == null) {
            System.out.println("db vendor does NOT support ParameterMetaData");
        } else {
            System.out.println("db vendor supports ParameterMetaData");
            // find out the number of dynamic parameters
            int paramCount = paramMetaData.getParameterCount();
            System.out.println("paramCount=" + paramCount);
            System.out.println("-------------------");
            for (int param = 1; param <= paramCount; param++) {
                System.out.println("param number=" + param);
                int nullable = paramMetaData.isNullable(param);
                if (nullable == ParameterMetaData.parameterNoNulls) {
                    System.out.println("parameter will not allow NULL values.");
                } else if (nullable == ParameterMetaData.parameterNullable) {
                    System.out.println("parameter will allow NULL values.");
                } else {
                    System.out.println("nullability of a parameter is unknown.");
                }
            }
        }

        pstmt.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;
    }
}