JDBC

JDBC( Java Data Base Connectivity ) is one of the technique of JavaEE.

How to use JDBC to query the data in the table and print the data in the console via java?

　　1. Register the sql driver

　　2. Get the connection with database

　　3. Create the sql statement object

　　4. Execute the sql statement

　　5. If you execute the query statement, you should handle the result

　　6. Close the resource

　　for exmaple:

public void test() throws Exception{

　　// register the driver
   //DriverManager.register(new com.mysql.jdbc.Driver());  ----------> not recommended
　　Class.forName("com.mysql.jdbc.Driver()");
　　// get the connection of database
    Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/day15","root","root");
　　// create statement object
    Statement statement = connection.createStatement();  
　　// execute the sql statement      
    ResultSet results = statement.executeQuery(‘SELECT * FROM users‘);
　　// get the information in the table
  while(results.next()){
    String id = results.getObject("id");
    String name = results.getObject("name");    
    String password = results.getObject("password");    
    String email = results.getObject("email");    
    String birthday = results.getObject("birthday");        
    }    
　　// close the resource
    results.close();
    statement.close();
    connection.close();
}

DriverManager:

　　function:

　　　　1. register the driver:

　　　　　　Class.forName("com.mysql.jdbc.Driver");

　　　　2. get the connection:

　　　　　　Connection connection = DriverManager.getConnecion("jdbc:mysql://localhost:3306/mydb1","root","root");

　　　　　　three ways to get the connection:

　　　　　　　　method1:

　　　　　　　　　　DriverManager.getConnection("jdbc:mysql://localhost:3306/mydb1","root","root");

　　　　　　　　method2:

　　　　　　　　　　Properties prop = new Properties();

　　　　　　　　　　prop.put("user","root");

　　　　　　　　　　prop.put("password","root");

　　　　　　　　　　DriverManager.getConnection("jdbc:mysql://localhost:3306/mydb1",prop);

　　　　　　　　method3:

　　　　　　　　　　DriverManager.getConnection("jdbc:mysql://localhost:3306?user=root&password=root");

JDBC

原文：http://www.cnblogs.com/ppcoder/p/7425832.html