Java uses JDBC to connect to the database

Different databases need to go to the official website to download the corresponding driver jar, such as MySQL  https://dev.mysql.com/downloads/connector/j/

　　properties file

 1 #MySQL
 2 mysqlDriver:com.mysql.jdbc.Driver
 3 mysqlUrl:jdbc\:mysql\://localhost\:3306\/test
 4 mysqlUser:root
 5 mysqlPassword:root
 6 
 7 #Oracle
 8 oracleDriver:oracle.jdbc.driver.OracleDriver
 9 oracleUrl:jdbc\:oracle\:thin@localhost\:1521\:orcl
10 oracleUser:username
11 oraclePassword:password

 1 package com.CommonUtil;
 2 
 3 /**
 4  * JDBC工具类
 5  * @author Andrew
 6  */
 7 
 8 import java.io.IOException;
 9 import java.sql.Connection;
10 import java.sql.DriverManager;
11 import java.sql.ResultSet;
12 import java.sql.SQLException;
13 import java.sql.Statement;
14 import java.util.Properties;
15 
16 public class JDBCUtil {
17      // Can help read and process information in resource files 
18      private  static Properties pros = null ;        
 19      // Static code block, load config.properties file 
20      static {
 21          pros = new Properties();
 22          try {
 23              pros .load(Thread.currentThread().getContextClassLoader().getResourceAsStream("./com/config/config.properties" ));
 24          } catch (IOException e) {
 25              e.printStackTrace();
 26          }
 27      }
 28      
29     /**
30      * 建立MySQL数据库连接
31      * @return    java.sql.Connection连接对象
32      * @throws ClassNotFoundException
33      * @throws SQLException
34      */
35     public static Connection getMySQLConn() throws ClassNotFoundException, SQLException {
36         Class.forName(pros.getProperty("mysqlDriver"));
37         return DriverManager.getConnection(pros.getProperty("mysqlUrl"), pros.getProperty("mysqlUser"), 
38                 pros.getProperty("mysqlPassword"));
39     }
40 
41     /**
42      * 建立Oracle数据库连接
43      * @return    java.sql.Connection连接对象
44      * @throws ClassNotFoundException
45      * @throws SQLException
46      */
47     public static Connection getOracleConn() throws ClassNotFoundException, SQLException {
48         Class.forName(pros.getProperty("oracleDriver"));
49         return DriverManager.getConnection(pros.getProperty("oracleUrl"), pros.getProperty("oracleUser"), 
 50                  pros.getProperty("oraclePassword" ));
 51      }
 52      
53      /** 
54       * Close all database connections
 55       * @param rs ResultSet object
 56       * @param stmt Statement object
 57       * @param conn Connection object
 58       * @throws SQLException
 59 * / 60 public void closeAll(ResultSet rs, Statement stmt, Connection conn) throws SQLException {
 61 if (rs != null      
               )            
62             rs.close();    
63         if (stmt != null)         
64             stmt.close();    
65         if (conn != null)         
66             conn.close();    
67     }
68 
69     //关闭ResultSet结果集
70     public void close(ResultSet rs) throws SQLException {
71         if (rs != null) {
72             rs.close();
73         }
74     }
75 
76      // Close Statement 
77      public  void close(Statement stmt) throws SQLException {
 78          if (stmt != null ) {
 79              stmt.close();
 80          }
 81      }
 82      
83      // Close the database Connection object 
84      public  void close( Connection conn) throws SQLException {
 85              if (conn != null ) {
 86                  conn.close();
 87              }
 88      }
 89}