MySQL tutorial--detailed explanation of the operation of connecting to the database through the configuration file-Mysql Tutorial-php.cn

MySQL tutorial--detailed explanation of the operation of connecting to the database through the configuration file

巴扎黑

Release： 2017-08-15 13:36:07

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This article mainly introduces the relevant information about mysql connecting to the database through the configuration file. It is mainly the implementation of a single-case Hungry-style database connection method tool class. Friends who need it can refer to it

Mysql links the database through the configuration file

Configuration file jdbc.properties

##MySQL
driver=com.mysql.jdbc.Driver
url=jdbc\:mysql\:///ake?useUnicode\=true&characterEncoding\=UTF-8
username=root
password=1234

##Oracle
#driver=oracle.jdbc.driver.OracleDriver
#url=jdbc:oracle:thin:@127.0.0.1:1521:orcl
#username=scott
#password=tiger

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Let’s talk about it briefly. The configuration file writes the database information of MySQL and Oracle. My database is mysql, so I commented out the Oracle configuration information.

The next step is a singleton (hungry Chinese style) tool class to obtain the database connection method

package Studying.d15;

import java.io.FileInputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.util.Properties;

public class ConnUtils {
  private static Connection con = null;

  static{
    try {
      Properties p = new Properties();
      p.load( new FileInputStream("jdbc.properties") );
      String driver = p.getProperty("driver");
      String url = p.getProperty("url");
      String username = p.getProperty("username");
      String password = p.getProperty("password");
      System.out.println(url+","+driver);
      Class.forName(driver);
      con = DriverManager.getConnection(url, username, password);
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
  public static Connection getConnection(){
    return con;
  }
}

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