01. 基礎準備

　　mysql連線庫： mysql-connector-java-8.0.23.jar

　　測試單元庫：   junit-4.5.jar

02. Druid的準備

　　>> 匯入Jar包：  druid-1.1.22.jar

　　>> 配置 druid.properties : 

03. JDBCTemplate 準備

　　>> 匯入 Jar 包:

　　　　　　spring-beans-5.3.6.jar

　　　　　　spring-core-5.3.6.jar

　　　　　　spring-jdbc-5.3.6.jar

　　　　　　spring-tx-5.3.6.jar

　　　　　　commons-logging-1.2.jar

04. Druid連線池準備　　

　　>> 公用單元的配置　　

 1 public class JDBCUtils {
 2     private static DataSource ds;
 3     static {
 4         try {
 5             Properties pro = new Properties();
 6             InputStream is = JDBCUtils.class.getClassLoader().getResourceAsStream("druid.properties");
 
 7             pro.load(is);
 8             ds = DruidDataSourceFactory.createDataSource(pro);
 9         } catch (IOException e) {
10             e.printStackTrace();
11         } catch (Exception e) {
12             e.printStackTrace();
13         }
14     }
15 
16     //返回連線池物件
17     public static DataSource getDataSource(){
 
18         return ds;
19     }
20 
21     //返回連線物件
22     public static Connection getConnection() throws SQLException {
23         return ds.getConnection();
24     }
25 
26     //資源釋放
27     public static void Close(Statement stmt,Connection con){
28         if(stmt!=null){
29             try {
30                 stmt.close();
31             } catch (SQLException e) {
32                 e.printStackTrace();
33             }
34         }
35         if(con!=null){
36             try {
37                 con.close();
38             } catch (SQLException e) {
39                 e.printStackTrace();
40             }
41         }
42     }
43     public static void Close(ResultSet rs, Statement stmt, Connection con){
44         if(rs!=null){
45             try {
46                 rs.close();
47             } catch (SQLException e) {
48                 e.printStackTrace();
49             }
50         }
51         Close(stmt,con);
52     }
53 }

 05. DML 演示

 1 @Test
 2     public void Test01() throws SQLException {
 3         //取Template
 4         JdbcTemplate template = new JdbcTemplate(JDBCUtils.getDataSource());
 5         //配置 SQL
 6         String sql="Insert into user(username,birthday,sex,address) Values (?,?,?,?)";
 7 
 8         //執行
 9         Date date = new Date();
10         int i = template.update(sql, "張三丰", date, "男", "湖北");
11         assert i==1;
12     }
13 
14     @Test
15     public void Test02(){
16         JdbcTemplate template = new JdbcTemplate(JDBCUtils.getDataSource());
17         String sql = "update user set address=? where id=?";
18         int i = template.update(sql, "湖南", 46);
19         System.out.println(i);
20     }
21 
22     @Test
23     public void Test03(){
24         JdbcTemplate template = new JdbcTemplate(JDBCUtils.getDataSource());
25         String sql = "Delete from user where id=?";
26         int i = template.update(sql, 46);
27         System.out.println(i);
28     }

06. DQL 演示　　

 1 @Test
 2     public void Test04(){
 3         JdbcTemplate template = new JdbcTemplate(JDBCUtils.getDataSource());
 4         String sql = "select * from user where id=?";
 5         Map<String, Object> map = template.queryForMap(sql, 45);
 6         System.out.println(map);
 7     }
 8 
 9     @Test
10     public void Test05(){
11         JdbcTemplate template = new JdbcTemplate(JDBCUtils.getDataSource());
12         String sql = "select * from user where id<?";
13         List<Map<String, Object>> maps = template.queryForList(sql, 0);
14         System.out.println(maps);
15     }
16 
17     @Test
18     public void Test06(){
19         JdbcTemplate template = new JdbcTemplate(JDBCUtils.getDataSource());
20         String sql = "select * from user ";
21         List<User> list = template.query(sql, new BeanPropertyRowMapper<User>(User.class));
22         for (User user : list) {
23             System.out.println(user);
24         }
25     }