1 整合JdbcTemplate
1.1 引入需要的pom依賴
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
<version>2.2.5.RELEASE</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.25</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>1.1.10</version>
</dependency>
1.2 application.properties中配置數據庫連接信息
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/test
spring.datasource.username=root
spring.datasource.password=admin
1.3 創建數據庫表及實體類
實體類User.java
public class User {
private Integer id;
private String username;
private Integer age;
private String address;
//省略getter和setter方法
}
1.4 注入JdbcTemplate編寫增、刪、改、查方法並測試
1.4.1 插入數據
@Service
public class UserService {
//springboot引入spring-boot-stater-jdbc依賴後可直接注入JdbcTemplate使用
@Autowired
JdbcTemplate jdbcTemplate;
//添加一條用戶信息
public Integer addUser(User user){
return jdbcTemplate.update("insert into user (username,age,address) values (?,?,?)",
user.getUsername(),user.getAge(),user.getAddress());
}
}
編寫測試方法並運行:
@SpringBootTest
class SpringbootdemoApplicationTests {
@Autowired
UserService userService;
@Test
void test1() {
User user = new User();
user.setUsername("張三");
user.setAge(17);
user.setAddress("北京市");
userService.addUser(user);
}
}
數據成功插入user表
1.4.2 查詢數據
方式一:
public List<User> getAllUsers(){
//適用於數據庫表字段與實體類字段一致
return jdbcTemplate.query("select * from user", new BeanPropertyRowMapper(User.class));
}
測試方法及運行結果
@Test
void test2(){
List<User> users = userService.getAllUsers();
System.out.println(users);
}
方式二:
public List<User> getAllUsers(){
//適用於數據庫表字段與實體類字段一致
//return jdbcTemplate.query("select * from user", new BeanPropertyRowMapper(User.class));
//適用於數據庫表字段與實體類字段不一致
return jdbcTemplate.query("select * from user", new RowMapper<User>() {
@Override
public User mapRow(ResultSet rs, int rowNum) throws SQLException {
int id= rs.getInt("id");
String username = rs.getString("username");
int age = rs.getInt("age");
String address = rs.getString("address");
User user = new User();
user.setId(id);
user.setUsername(username);
user.setAge(age);
user.setAddress(address);
return user;
}
});
}
運行結果:
1.4.3 修改用戶信息
userService修改用戶信息方法:
//通過id修改用戶名
public Integer updateUserNameById(User user){
return jdbcTemplate.update("update user set username=? where id=?",user.getUsername(),user.getId());
}
測試方法:
@Test
void test3(){
User user = new User();
user.setId(1);
user.setUsername("李四");
userService.updateUserNameById(user);
test2();
}
運行結果:
1.4.4 刪除用戶信息
userService刪除方法
public Integer deleteUserById(Integer id){
return jdbcTemplate.update("delete from user where id = ?",id);
}
測試方法:
@Test
void test4(){
userService.deleteUserById(1);
test2();
}
運行結果:
2 配置JdbcTemplate多數據源
2.1 準備
首先準備兩個數據庫,方便起見,數據庫表及字段一致,數據庫名稱不一致,如下:
兩張表數據分別如下:
test數據庫user表
test01數據庫user表
2.2 application.properties中配置兩個數據源如下:
#test數據庫數據源
spring.datasource.test.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.test.url=jdbc:mysql://127.0.0.1:3306/test
spring.datasource.test.username=root
spring.datasource.test.password=admin
#test01數據庫數據源
spring.datasource.test01.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.test01.url=jdbc:mysql://127.0.0.1:3306/test01
spring.datasource.test01.username=root
spring.datasource.test01.password=admin
2.3 編寫配置類注入數據源到JdbcTemplate
@Configuration
public class WebMvcConfig {
@Bean
@ConfigurationProperties(prefix = "spring.datasource.test")
DataSource test(){
return DruidDataSourceBuilder.create().build();
}
@Bean
@ConfigurationProperties(prefix = "spring.datasource.test01")
DataSource test01(){
return DruidDataSourceBuilder.create().build();
}
}
2.4 配置不同數據源JdbcTemplate
@Configuration
public class JdbcTemplateConfig {
@Bean//注入dsTest數據源到jdbcTemplateTest
JdbcTemplate jdbcTemplateTest(@Qualifier("dsTest") DataSource dsTest){
return new JdbcTemplate(dsTest);
}
@Bean//注入dsTest01數據源到jdbcTemplateTest01
JdbcTemplate jdbcTemplateTest01(@Qualifier("dsTest01") DataSource dsTest01){
return new JdbcTemplate(dsTest01);
}
}
2.5 Service層引入兩個不同數據源JdbcTemplate並查詢
@Service
public class UserService01 {
@Resource(name = "jdbcTemplateTest")
JdbcTemplate jdbcTemplateTest;
@Autowired
@Qualifier("jdbcTemplateTest01")
JdbcTemplate jdbcTemplateTest01;
public List<User> selectUsersByTest(){
return jdbcTemplateTest.query("select * from user", new BeanPropertyRowMapper(User.class));
}
public List<User> selectUsersByTest01(){
return jdbcTemplateTest01.query("select * from user", new BeanPropertyRowMapper(User.class));
}
}
2.6 查詢測試
@Test
void test1(){
List<User> usersByTest = userService01.selectUsersByTest();
System.out.println("usersByTest:"+usersByTest);
List<User> usersByTest01 = userService01.selectUsersByTest01();
System.out.println("usersByTest01:"+usersByTest01);
}