Spring之ioc连接数据库的一个小案例

用到的包:
spring5
spring-test
dbutils
mysql
c3p0
junit
1.配置pom.xml

<dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.3.2</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>5.3.2</version>
        </dependency>

        <dependency>
            <groupId>commons-dbutils</groupId>
            <artifactId>commons-dbutils</artifactId>
            <version>1.7</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.32</version>
        </dependency>

        <dependency>
            <groupId>c3p0</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.1.2</version>
        </dependency>

        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>

    </dependencies>




    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.0</version>
                <configuration>
                    <source>8</source>
                    <target>8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>

2.配置spring的配置类
创建一个config包
2个类
SpringConfig
JdbcConfig

@Configuration
@ComponentScan("top.chenyp")
@Import(JdbcConfig.class)
@PropertySource("classpath:jdbc.properties")
public class SpringConfig {
    
    }

public class JdbcConfig {
    
    

    @Value("${jdbc.driver}")
    private String driver;
    @Value("${jdbc.url}")
    private String url;
    @Value("${jdbc.user}")
    private String user;
    @Value("${jdbc.psd}")
    private String psd;

    //创建runner

    @Bean
    QueryRunner createQueryRunner(DataSource ds){
    
    
        return new QueryRunner(ds);
    }

    //创建DataSource

    @Bean
    DataSource createDataSource(){
    
    
        ComboPooledDataSource ds =new ComboPooledDataSource();
        try {
    
    
            ds.setDriverClass(driver);
            ds.setJdbcUrl(url);
            ds.setUser(user);
            ds.setPassword(psd);

        } catch (PropertyVetoException e) {
    
    
            e.printStackTrace();
        }
        return ds;
    }

}

3.创建实体类

package top.chenyp.pojo;

import java.io.Serializable;

public class User implements Serializable {
    
    

    private Integer id;

    private String username;

    private String password;

    private String gender;

    private String city;

    public Integer getId() {
    
    
        return id;
    }

    public void setId(Integer id) {
    
    
        this.id = id;
    }

    public String getUsername() {
    
    
        return username;
    }

    public void setUsername(String username) {
    
    
        this.username = username;
    }

    public String getPassword() {
    
    
        return password;
    }

    public void setPassword(String password) {
    
    
        this.password = password;
    }

    public String getGender() {
    
    
        return gender;
    }

    public void setGender(String gender) {
    
    
        this.gender = gender;
    }

    public String getCity() {
    
    
        return city;
    }

    public void setCity(String city) {
    
    
        this.city = city;
    }


    @Override
    public String toString() {
    
    
        return "User{" +
                "id=" + id +
                ", username='" + username + '\'' +
                ", password='" + password + '\'' +
                ", gender='" + gender + '\'' +
                ", city='" + city + '\'' +
                '}';
    }
}

4.创建properties文件配置jdbc的信息

jdbc.driver= com.mysql.jdbc.Driver
jdbc.url= jdbc:mysql:///test
jdbc.user= root
jdbc.psd= Cyp123..

5.测试类,测试
spring整合junit

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = SpringConfig.class)
public class Test {
    
    

    @Autowired
    private QueryRunner runner;


    @org.junit.Test
    public void test1(){
    
    

        String sql ="select * from user";

        try {
    
    
            List<User> users = runner.query(sql, new BeanListHandler<User>(User.class));

            for (User user : users) {
    
    
                System.out.println(user);
            }

        } catch (SQLException e) {
    
    
            e.printStackTrace();
        }

    }
}

最后的运行结果,over!!!