Parsing Spring Day (Spring in things, Spring framework to govern the template class)

JDBC template technology:
Spring framework provides many template class persistence simple written to simplify programming, the program will become a template class
- template template
- Spring framework is provided XxxTemplate
JDBC provides a template, Spring framework provides
- JdbcTemplate class, Connection represents a connection Management Statement ResultSet
How to use JDBC template class?

New tables and data structures in a database

 1 DROP TABLE IF EXISTS `account`;
 2 CREATE TABLE `account` (
 3   `id` int(11) NOT NULL AUTO_INCREMENT,
 4   `name` varchar(40) DEFAULT NULL,
 5   `money` double DEFAULT NULL,
 6   PRIMARY KEY (`id`)
 7 ) ENGINE=InnoDB AUTO_INCREMENT=7 DEFAULT CHARSET=utf8;
 8 
 9 -- ----------------------------
10 -- Records of account
11 -- ----------------------------
12 INSERT INTO `account` VALUES ('1', 'aaa', '1000');
13 INSERT INTO `account` VALUES ('2', 'bbb', '1000');
14 INSERT INTO `account` VALUES ('3', 'ccc', '1000');
15 INSERT INTO `account` VALUES ('4', '熊大', '700');
16 INSERT INTO `account` VALUES ('5', '熊二', '1200');
17 INSERT INTO `account` VALUES ('6', '熊三', '800');

Creating a common Maven project, the introduction of coordinates

 1 <dependencies>
 2     <dependency>
 3         <groupId>org.springframework</groupId>
 4         <artifactId>spring-context</artifactId>
 5         <version>5.0.2.RELEASE</version>
 6     </dependency>
 7     <dependency>
 8         <groupId>commons-logging</groupId>
 9         <artifactId>commons-logging</artifactId>
10         <version>1.2</version>
11     </dependency>
12     <dependency>
13         <groupId>log4j</groupId>
14         <artifactId>log4j</artifactId>
15         <version>1.2.12</version>
16     </dependency>
17     <dependency>
18         <groupId>junit</groupId>
19         <artifactId>junit</artifactId>
20         <version>4.12</version>
21     </dependency>
22     <dependency>
23         <groupId>org.springframework</groupId>
24         <artifactId>spring-test</artifactId>
25         <version>5.0.2.RELEASE</version>
26     </dependency>
27     
28     <dependency>
29         <groupId>aopalliance</groupId>
30         <artifactId>aopalliance</artifactId>
31         <version>1.0</version>
32     </dependency>
33     <dependency>
34         <groupId>org.springframework</groupId>
35         <artifactId>spring-aspects</artifactId>
36         <version>5.0.2.RELEASE</version>
37     </dependency>
38     <dependency>
39         <groupId>org.aspectj</groupId>
40         <artifactId>aspectjweaver</artifactId>
41         <version>1.8.13</version>
42     </dependency>
43     <dependency>
44         <groupId>mysql</groupId>
45         <artifactId>mysql-connector-java</artifactId>
46         <version>5.1.6</version>
47     </dependency>
48     <dependency>
49         <groupId>org.springframework</groupId>
50         <artifactId>spring-jdbc</artifactId>
51         <version>5.0.2.RELEASE</version>
52     </dependency>
53     <dependency>
54         <groupId>org.springframework</groupId>
55         <artifactId>spring-tx</artifactId>
56         <version>5.0.2.RELEASE</version>
57     </dependency>
58   </dependencies>

Using the Spring framework to manage the template class, Spring built-in connection pool management

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4        xmlns:context="http://www.springframework.org/schema/context"
 5        xmlns:aop="http://www.springframework.org/schema/aop"
 6        xsi:schemaLocation="
 7                 http://www.springframework.org/schema/beans
 8                 http://www.springframework.org/schema/beans/spring-beans.xsd
 9                 http://www.springframework.org/schema/context
10                 http://www.springframework.org/schema/context/spring-context.xsd
11                 http://www.springframework.org/schema/aop
12                 http://www.springframework.org/schema/aop/spring-aop.xsd">
13 
14     <!--配置连接池-->
15     <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
16         <property name="driverClassName" value="com.mysql.jdbc.Driver" />
17         <property name="url" value="jdbc:mysql:///spring_db" />
18         <property name="username" value="root" />
19         <property name="password" value="root" />
20     </bean>
21 
22     <!--配置jdbc模板-->
23     <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
24         <property name="dataSource" ref="dataSource" />
25     </bean>
26 
27 </beans>

Test jdbcTemplate

 
package cn.tx.test;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;


@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(value = "classpath:applicationContext_jdbc.xml")
public class Demo1_1 {

    @Autowired
    privateThe jdbcTemplate the JdbcTemplate; 
    / ** 
     * test mode 
     * / 
    @Test 
    public  void runl () { 
        jdbcTemplate.update ( "INSERT INTO Account values (null,,)??", "Bears two", 500 ); 
    } 
}

Spring Framework open source connection pool management

Open connection pool configuration, connection pool using Druid introduced coordinates

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid</artifactId>
    <version>1.1.10</version>
</dependency>

Create a properties file suffix. The Properties. Basic information of this connection configuration database

1 jdbc.driverClassName=com.mysql.jdbc.Driver
2     jdbc.url=jdbc:mysql:///spring_db
3     jdbc.username=root
4     jdbc.password=root

In the xml file to read the configuration properties file, connect to the database and configuration templates jdbc

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4        xmlns:context="http://www.springframework.org/schema/context"
 5        xmlns:aop="http://www.springframework.org/schema/aop"
 6        xsi:schemaLocation="
 7                 http://www.springframework.org/schema/beans
 8                 http://www.springframework.org/schema/beans/spring-beans.xsd
 9                 http://www.springframework.org/schema/context 
10                  HTTP: // www.springframework.org/schema/context/spring-context.xsd 
11                  HTTP: // www.springframework.org/schema/aop 
12                  HTTP: // the WWW. springframework.org/schema/aop/spring-aop.xsd "> 
13 is  14      <-! configuration connection pool, built using the Spring framework connection pool
 15      <the bean ID =" the dataSource " class =" org.springframework. jdbc.datasource.DriverManagerDataSource ">
 16          <Property name =" driverClassName "value =" com.mysql.jdbc.Driver "/>
 . 17         <property name="url" value="jdbc:mysql:///spring_db" />
18         <property name="username" value="root" />
19         <property name="password" value="root" />
20     </bean>
21     -->
22 
23     <!--使用开源连接池
24     <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
25         <property name="driverClassName" value="com.mysql.jdbc.Driver" />
26         <property name="url" value="jdbc:mysql:///spring_db" />
27         <property name="username" value="root" />
28         <Property name = "password" value = "the root" />
 29      </ the bean>
 30      ->
 31 is  32      <-! A properties file
 33 is      <the bean ID = "placeholderConfigurer" class = "the org.springframework.beans. factory.config.PropertyPlaceholderConfigurer ">
 34 is          <Property name =" LOCATION "value =" CLASSPATH: the jdbc.properties "/>
 35      </ the bean>
 36      ->
 37 [ 38 is      <- second written:! use the tag way ->
 39      <context: Property-placeholder LOCATION = "CLASSPATH: the jdbc.properties" />
40 41 is      <! - attribute file loading ->
  42     <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
43         <property name="driverClassName" value="${jdbc.driverClassName}" />
44         <property name="url" value="${jdbc.url}" />
45         <property name="username" value="${jdbc.username}" />
46         <property name="password" value="${jdbc.password}" />
47     </bean>
48 
49     <!--配置jdbc模板-->
50     <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
51         <property name="dataSource" ref="dataSource" />
52     </bean>
53 
54 </beans>

The basic operation of the data to do the test, CRUD

package cn.tx.test;

import cn.tx.demo1.Account;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;


@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(value = "classpath:applicationContext_jdbc.xml")
public class Demo1_1 {

    @Autowired
    private JdbcTemplate jdbcTemplate;

    /**
     * 测试的方式
     */
    @Test
    public void run1(){
        jdbcTemplate.update("insert into account values (null,?,?)","熊四",800);
    }

    /**
     * 修改
     */
    @Test
    public void run2(){
        jdbcTemplate.update("update account set name =, money = where id =???", " bald strong", 100,7 ); 
    } 
    / ** 
     * delete 
     * / 
    @Test 
    public  void RUN3 During () { 
        jdbcTemplate.update ( "the Delete WHERE id = Account from? ",. 7 ); 
    } 
    / ** 
     * query by id 
     * / 
    @Test 
    public  void run4 () { 
        the Account Account = jdbcTemplate.queryForObject (" SELECT * from Account WHERE id = ",? new new BeanMapper (),. 6 ); 
        System.out.println (Account); 
    } 
    / ** 
     * query all the data 
     * /
    @Test 
    public  void run5 () { 
        List <the Account> jdbcTemplate.query List = ( "SELECT * from Account", new new BeanMapper ());
         for (the Account Account: List) { 
            System.out.println (Account); 
        } 
    } 
} 
/ ** 
 * implementation class for data encapsulation 
 * / 
class BeanMapper the implements the RowMapper <the Account> { 
    / ** 
     * is the data row by row encapsulation 
     * @param the resultSet 
     * @param I 
     * @return 
     *@throws SQLException
     */
    @Override
    public Account mapRow(ResultSet resultSet, int i) throws SQLException {
        Account account = new Account();
        account.setId(resultSet.getInt("id"));
        account.setName(resultSet.getString("name"));
        account.setMoney(resultSet.getDouble("money"));
        return account;
    }

}

Parsing Spring Day (Spring in things, Spring framework to govern the template class)

Spring Framework open source connection pool management

Guess you like