SpringBoot中使用JdbcTemplate访问Oracle数据库的案例详解

<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
<!--导入jdbc依赖-->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-jdbc</artifactId>
		</dependency>
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
		</dependency>
		<dependency>
			<groupId>com.oracle.ojdbc</groupId>
			<artifactId>ojdbc8</artifactId>
			<version>19.3.0.0</version>
		</dependency>
		<dependency>
			<groupId>org.projectlombok</groupId>
			<artifactId>lombok</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>

# Mysql的配置
#spring.datasource.url=jdbc:mysql://localhost:3306/test
#spring.datasource.username=root
#spring.datasource.password=123456
#spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
# Oracle的配置
spring.datasource.url=jdbc:oracle:thin:@localhost:1521/orcl
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=oracle.jdbc.driver.OracleDriver

CREATE TABLE useradd (
  name varchar2 (100) NOT NULL,
  age integer NOT NULL
)

public class User {
    private String name;
    private Integer age;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public Integer getAge() {
        return age;
    }
    public void setAge(Integer age) {
        this.age = age;
    }
    public User(String name, Integer age) {
        this.name = name;
        this.age = age;
    }
    public User() {
    }
    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        User user = (User) o;
        return Objects.equals(name, user.name) && Objects.equals(age, user.age);
    }
    @Override
    public int hashCode() {
        return Objects.hash(name, age);
    }
    @Override
    public String toString() {
        return "User{" +
                "name='" + name + '\'' +
                ", age=" + age +
                '}';
    }
}

public interface UserService {
    /**
     * 新增一个用户
     *
     * @param name
     * @param age
     */
    int create(String name, Integer age);
    /**
     * 根据name查询用户
     *
     * @param name
     * @return
     */
    List<User> getByName(String name);
    /**
     * 根据name删除用户
     *
     * @param name
     */
    int deleteByName(String name);
    /**
     * 获取用户总量
     */
    int getAllUsers();
    /**
     * 删除所有用户
     */
    int deleteAllUsers();
}

@Service
public class UserServiceImpl implements UserService {
    private JdbcTemplate jdbcTemplate;
    UserServiceImpl(JdbcTemplate jdbcTemplate) {
        this.jdbcTemplate = jdbcTemplate;
    }
    @Override
    public int create(String name, Integer age) {
        return jdbcTemplate.update("insert into USERADD(NAME, AGE) values(?, ?)", name, age);
    }
    @Override
    public List<User> getByName(String name) {
        List<User> users = jdbcTemplate.query("select NAME, AGE from USERADD where NAME = ?", (resultSet, i) -> {
            User user = new User();
            user.setName(resultSet.getString("NAME"));
            user.setAge(resultSet.getInt("AGE"));
            return user;
        }, name);
        return users;
    }
    @Override
    public int deleteByName(String name) {
        return jdbcTemplate.update("delete from USERADD where NAME = ?", name);
    }
    @Override
    public int getAllUsers() {
        return jdbcTemplate.queryForObject("select count(1) from USERADD", Integer.class);
    }
    @Override
    public int deleteAllUsers() {
        return jdbcTemplate.update("delete from USERADD");
    }
}

@RunWith(SpringRunner.class)
@SpringBootTest
public class Chapter31ApplicationTests {
    @Autowired
    private UserService userSerivce;
    @Before
    public void setUp() {
        // 准备，清空user表
        userSerivce.deleteAllUsers();
    }
    @Test
    public void test() throws Exception {
        // 插入5个用户
        userSerivce.create("miaow", 10);
        userSerivce.create("jjkeo", 11);
        userSerivce.create("cfase", 30);
        userSerivce.create("okeda", 21);
        userSerivce.create("joke", 17);
        // 查询名为Oscar的用户，判断年龄是否匹配
        List<User> userList = userSerivce.getByName("joke");
        Assert.assertEquals(17, userList.get(0).getAge().intValue());
        // 查数据库，应该有5个用户
        Assert.assertEquals(5, userSerivce.getAllUsers());
        // 删除两个用户
        userSerivce.deleteByName("jjkeo");
        userSerivce.deleteByName("cfase");
        // 查数据库，应该有5个用户
        Assert.assertEquals(3, userSerivce.getAllUsers());
    }
}