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- import java.sql.*;
- import java.sql.Connection;
- import java.sql.DriverManager;
- import java.sql.SQLException;
- import java.sql.Statement;
- import java.util.Properties;
- /**
- * This class demonstrates how to connect to MySQL and run some basic commands.
- *
- * In order to use this, you have to download the Connector/J driver and add
- * its .jar file to your build path. You can find it here:
- *
- * http://dev.mysql.com/downloads/connector/j/
- *
- * You will see the following exception if it's not in your class path:
- *
- * java.sql.SQLException: No suitable driver found for jdbc:mysql://localhost:3306/
- *
- * To add it to your class path:
- * 1. Right click on your project
- * 2. Go to Build Path -> Add External Archives...
- * 3. Select the file mysql-connector-java-5.1.24-bin.jar
- * NOTE: If you have a different version of the .jar file, the name may be
- * a little different.
- *
- * The user name and password are both "root", which should be correct if you followed
- * the advice in the MySQL tutorial. If you want to use different credentials, you can
- * change them below.
- *
- * You will get the following exception if the credentials are wrong:
- *
- * java.sql.SQLException: Access denied for user 'userName'@'localhost' (using password: YES)
- *
- * You will instead get the following exception if MySQL isn't installed, isn't
- * running, or if your serverName or portNumber are wrong:
- *
- * java.net.ConnectException: Connection refused
- */
- public class DBDemoo {
- /** The name of the MySQL account to use (or empty for anonymous) */
- private final String userName = "root";
- /** The password for the MySQL account (or empty for anonymous) */
- private final String password = "root";
- /** The name of the computer running MySQL */
- private final String serverName = "localhost";
- /** The port of the MySQL server (default is 3306) */
- private final int portNumber = 3306;
- /** The name of the database we are testing with (this default is installed with MySQL) */
- private final String dbName = "test";
- /** The name of the table we are testing with */
- private final String tableName = "JDBC_TESTTT";
- /**
- * Get a new database connection
- *
- * @return
- * @throws SQLException
- */
- public Connection getConnection() throws SQLException {
- Connection conn = null;
- Properties connectionProps = new Properties();
- connectionProps.put("user", this.userName);
- connectionProps.put("password", this.password);
- conn = DriverManager.getConnection("jdbc:mysql://"
- + this.serverName + ":" + this.portNumber + "/" + this.dbName,
- connectionProps);
- return conn;
- }
- /**
- * Run a SQL command which does not return a recordset:
- * CREATE/INSERT/UPDATE/DELETE/DROP/etc.
- *
- * @throws SQLException If something goes wrong
- */
- public boolean executeUpdate(Connection conn, String command) throws SQLException {
- Statement stmt = null;
- try {
- stmt = conn.createStatement();
- stmt.executeUpdate(command); // This will throw a SQLException if it fails
- return true;
- } finally {
- // This will run whether we throw an exception or not
- if (stmt != null) { stmt.close(); }
- }
- }
- /**
- * Connect to MySQL and do some stuff.
- */
- public void run() {
- // Connect to MySQL
- Connection conn = null;
- Statement stmt = null;
- try {
- conn = this.getConnection();
- System.out.println("Connected to database");
- } catch (SQLException e) {
- System.out.println("ERROR: Could not connect to the database");
- e.printStackTrace();
- return;
- }
- // Create a table
- try {
- String createString =
- "CREATE TABLE " + this.tableName + " ( " +
- "ID INTEGER NOT NULL, " +
- "NAME varchar(40) NOT NULL, " +
- "STREET varchar(40) NOT NULL, " +
- "CITY varchar(20) NOT NULL, " +
- "STATE char(2) NOT NULL, " +
- "ZIP char(5), " +
- "PRIMARY KEY (ID))";
- this.executeUpdate(conn, createString);
- System.out.println("Created a table");
- } catch (SQLException e) {
- System.out.println("ERROR: Could not create the table");
- e.printStackTrace();
- return;
- }
- //Insert into the table
- try {
- /* String insertString =
- "INSERT INTO " + this.tableName + " ( " +
- "ID INTEGER NOT NULL, " +
- "NAME varchar(40) NOT NULL, " +
- "STREET varchar(40) NOT NULL, " +
- "CITY varchar(20) NOT NULL, " +
- "STATE char(2) NOT NULL, " +
- "ZIP char(5), " +
- "PRIMARY KEY (ID))";*/
- System.out.println("Inserting tables to the records");
- stmt = conn.createStatement();
- String insertString = "INSERT INTO JDBC_TESTT VALUES (1002, 'Hey', 'shsh', 'shshsh','ss','123')";
- stmt.executeUpdate(insertString);
- System.out.println("Table Inserted");
- } catch (SQLException e) {
- System.out.println("ERROR: Could not Insert to the table");
- e.printStackTrace();
- return;
- }
- //Extracting Data from the table
- System.out.println("Creating statement..");
- try
- {
- stmt = conn.createStatement();
- String retreive;
- retreive = "Select name from JDBC_TESTT";
- ResultSet rs = stmt.executeQuery(retreive);
- while(rs.next()) {
- String name = rs.getString("name");
- System.out.println("Name:"+name);
- }
- }
- catch(SQLException se){
- //Handle errors for JDBC
- se.printStackTrace();
- }
- // Drop the table
- //try {
- // String dropString = "DROP TABLE " + this.tableName;
- // this.executeUpdate(conn, dropString);
- // System.out.println("Dropped the table");
- // } catch (SQLException e) {
- // System.out.println("ERROR: Could not drop the table");
- // e.printStackTrace();
- // return;
- //}
- }
- /**
- * Connect to the DB and do some stuff
- */
- public static void main(String[] args) {
- DBDemoo app = new DBDemoo();
- app.run();
- }
- }
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