JDBC Tool class encapsulates database connections

First, create a file db.properties that holds the database connection information.

Writing code to connect to a database

Package COM.JDBC;

Import java.io.IOException;
Import Java.io.InputStream;
Import java.sql.Connection;
Import Java.sql.DriverManager;
Import Java.sql.ResultSet;
Import java.sql.SQLException;
Import java.sql.Statement;
Import java.util.Properties;

Public class Dbutils {

/**
* User name to connect to the database
*/
static String user = null;
/**
* Password to connect to the database
*/
static String password = null;
/**
* Address of the connection database
*/
static String url = null;
/**
* Drive to connect to the database
*/
static String driver = null;

static{
//Get input stream
InputStream in = DBUtils.class.getClassLoader (). getResourceAsStream ("Db.properties");
//Get Properties Object
Properties P = new properties ();

try {
//Read the configuration file for database connection information
p.load (in);
user = P.get ("user"). toString ();
Password = p.get ("password"). toString ();
url = p.get ("url"). toString ();
Driver = p.get ("Driver"). toString ();

//Registration driver
Class.forName (driver);
} catch (IOException e) {
e.printstacktrace ();
System.out.println ("Failed to read config file!!! ");
} catch (ClassNotFoundException e) {
e.printstacktrace ();
System.out.println ("Registration driver failed!!! ");
}
}


/**
* Connect to database
* @returnjava. Sql.connection
*/
Public static Connection getconnection () {
Connection conn = null;
try {
//Connect to database
conn = drivermanager.getconnection (URL, user, password);
} catch (SQLException e) {
e.printstacktrace ();
System.out.println ("Database connection Failed!!! ");
}
return conn;
}


/**
* Close Resources
* @param connjava.sql.Connection
* @param stasjava.sql.Statement
* @param rsjava.sql.ResultSet
*/
Public static void Close (Connection conn,statement Stas,resultset rs) {
try {
if (rs! = null) rs.close ();
if (Stas! = null) stas.close ();
if (conn! = null) conn.close ();
} catch (SQLException e) {
e.printstacktrace ();
}
}

}

JDBC Tool class encapsulates database connections