使用jdbcTemplate访问数据库

Chapter3-2-1/src/main/java/com/didispace/Application.java

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+package com.didispace;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class Application {
+
+	public static void main(String[] args) {
+		SpringApplication.run(Application.class, args);
+	}
+
+}

Chapter3-2-1/src/main/java/com/didispace/service/UserService.java

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+package com.didispace.service;
+
+/**
+ * @author 程序猿DD
+ * @version 1.0.0
+ * @date 16/3/17 下午7:04.
+ * @blog http://blog.didispace.com
+ */
+public interface UserService {
+
+    /**
+     * 新增一个用户
+     * @param name
+     * @param age
+     */
+    void create(String name, Integer age);
+
+    /**
+     * 根据name删除一个用户高
+     * @param name
+     */
+    void deleteByName(String name);
+
+    /**
+     * 获取用户总量
+     */
+    Integer getAllUsers();
+
+    /**
+     * 删除所有用户
+     */
+    void deleteAllUsers();
+
+
+}

Chapter3-2-1/src/main/java/com/didispace/service/UserServiceImpl.java

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+package com.didispace.service;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.jdbc.core.JdbcTemplate;
+import org.springframework.stereotype.Service;
+
+/**
+ * @author 程序猿DD
+ * @version 1.0.0
+ * @date 16/3/17 下午6:44.
+ * @blog http://blog.didispace.com
+ */
+@Service
+public class UserServiceImpl implements UserService {
+
+    @Autowired
+    private JdbcTemplate jdbcTemplate;
+
+    @Override
+    public void create(String name, Integer age) {
+        jdbcTemplate.update("insert into USER(NAME, AGE) values(?, ?)", name, age);
+    }
+
+    @Override
+    public void deleteByName(String name) {
+        jdbcTemplate.update("delete from USER where NAME = ?", name);
+    }
+
+    @Override
+    public Integer getAllUsers() {
+        return jdbcTemplate.queryForObject("select count(1) from USER", Integer.class);
+    }
+
+    @Override
+    public void deleteAllUsers() {
+        jdbcTemplate.update("delete from USER");
+    }
+}

Chapter3-2-1/src/main/resources/application.properties

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+spring.datasource.url=jdbc:mysql://localhost:3306/test
+spring.datasource.username=root
+spring.datasource.password=52261340
+spring.datasource.driver-class-name=com.mysql.jdbc.Driver

Chapter3-2-1/src/test/java/com/didispace/ApplicationTests.java

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+package com.didispace;
+
+import com.didispace.service.UserService;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.SpringApplicationConfiguration;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+
+
+@RunWith(SpringJUnit4ClassRunner.class)
+@SpringApplicationConfiguration(Application.class)
+public class ApplicationTests {
+
+	@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("a", 1);
+		userSerivce.create("b", 2);
+		userSerivce.create("c", 3);
+		userSerivce.create("d", 4);
+		userSerivce.create("e", 5);
+
+		// 查数据库，应该有5个用户
+		Assert.assertEquals(5, userSerivce.getAllUsers().intValue());
+
+		// 删除两个用户
+		userSerivce.deleteByName("a");
+		userSerivce.deleteByName("e");
+
+		// 查数据库，应该有5个用户
+		Assert.assertEquals(3, userSerivce.getAllUsers().intValue());
+
+	}
+
+
+}