springboot整合tkmapper
1.导入pom依赖
1.1 导入springboot的parent依赖
<parent>
<artifactId>spring-boot-starter-parent</artifactId>
<groupId>org.springframework.boot</groupId>
<version>2.1.9.RELEASE</version>
</parent>
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1.2 导入具体依赖
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
</dependency>
<!-- MySql -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.32</version>
</dependency>
<!-- druid连接池-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>1.1.10</version>
</dependency>
<!-- tkmapper-->
<dependency>
<groupId>tk.mybatis</groupId>
<artifactId>mapper-spring-boot-starter</artifactId>
<version>2.1.5</version>
</dependency>
<!-- pagehelper分页插件-->
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper-spring-boot-starter</artifactId>
<version>1.2.10</version>
</dependency>
<!-- lombok -->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.68</version>
</dependency>
</dependencies>
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2. 添加tkmapper数据库连接配置
- 创建application.yml配置类
spring:
datasource:
type: com.alibaba.druid.pool.DruidDataSource # 连接池指定 springboot2.02版本默认使用HikariCP 此处要替换成Druid
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql:///pethome?serverTimezone=Asia/Shanghai&characterEncoding=utf-8
username: root
password: qwe123
druid:
initial-size: 5 # 初始化时建立物理连接的个数
min-idle: 5 # 最小连接池连接数量,最小空闲数量
max-active: 20 # 最大连接池连接数量,最大活跃连接数
max-wait: 60000 # 配置获取连接等待超时的时间
timeBetweenEvictionRunsMillis: 60000
minEvictableIdleTimeMillis: 300000
validationQuery: SELECT 1
testWhileIdle: true
testOnBorrow: true
testOnReturn: false
poolPreparedStatements: true
maxPoolPreparedStatementPerConnectionSize: 20
filters: stat,wall
connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
stat-view-servlet:
allow: 0.0.0.0 # 允许哪些IP访问druid监控界面,多个IP以逗号分隔
login-username: admin # 设置登录帐号
login-password: 123456 # 设置登录密码
reset-enable: false # 是否允许重置数据
# url-pattern: /database/* # 默认访问根路径是:/druid/;也可以自定义设置
# mybatis配置
mybatis:
configuration:
map-underscore-to-camel-case: true
log-impl: org.apache.ibatis.logging.stdout.StdOutImpl # 设置控制台输入执行的sql语句
type-aliases-package: org.example.model
# tkmapper配置
mapper:
not-empty: false
identity: mysql #指定tkmapper加载的数据库
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3. 在启动类上添加扫描注解
- MainApp.java
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import tk.mybatis.spring.annotation.MapperScan;
@SpringBootApplication
@MapperScan(basePackages = "org.example.mapper")
public class App {
public static void main(String[] args) {
SpringApplication.run(App.class);
}
}
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4.tkmapper的使用
4.1 创建mapper.java
public interface ProductMapper extends Mapper<TProduct> {
}
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4.2 创建表对应的实体类TProduct
@Data
public class TProduct {
@Id //指定主键的注解
private Long id;
private String name;
private String resources;
private Double saleprice;
private java.util.Date offsaletime;
private java.util.Date onsaletime;
private Long state;
private String costprice;
private java.util.Date createtime;
private Long salecount;
}
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4.3 添加测试类,进行单表的CRUD操作
@SpringBootTest
@RunWith(SpringRunner.class)
public class AppTest {
@Autowired
private ProductMapper productMapper;
@Test//查询所有
public void findAll(){
List<TProduct> tProducts = productMapper.selectAll();
for (TProduct tProduct : tProducts) {
System.out.println(tProduct);
}
}
@Test
public void insert(){
TProduct product = new TProduct();
product.setName("我是测试的");
product.setCreatetime(new Date());
product.setState(1L);
productMapper.insert(product);
}
@Test
public void updateById(){
TProduct product = new TProduct();
product.setId(174L);
product.setName("我是测试");
//如果修改时,只想改变更新的name值,其他值不改
//下面这个方法,是无论修改的值是否为空,将全部修改
// productMapper.updateByPrimaryKey(product);
//下面的方法,只改非空的字段.
//注意:tkmapper中,凡是方法名以Selective结尾的,就是在拼接动态sql
//即,不更新非空的字段
product.setCreatetime(new Date());
productMapper.updateByPrimaryKeySelective(product);
}
@Test//删除操作
public void delete(){
productMapper.deleteByPrimaryKey(174L);
}
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4.4 多条件查询和分页查询
@SpringBootTest
@RunWith(SpringRunner.class)
public class QueryTest {
@Autowired
private ProductMapper productMapper;
@Test //根据多条件动态查询
public void queryByParam(){
//多条件查询
Example example = new Example(TProduct.class);
// //添加第1个条件 name:模糊查询
// example.and().andLike("name","%洗澡8%");
//
// //添加第2个条件 :价格在100以内
// example.and()
// .andGreaterThanOrEqualTo("saleprice",0).andLessThanOrEqualTo("saleprice",100);
//
// //添加第3个条件:状态 state =1
// example.and().andEqualTo("state",1);
//优化Sql中的括号 : 当多个条件如果是 平级,则不用example.and()去追加条件
Example.Criteria and = example.and();//Criteria对象:就是用于拼接查询条件,每次执行example.and()或者example.or()将都会创建一个新的查询条件的拼接对象(意味着多一组())
and.andLike("name","%洗澡8%").orEqualTo("state",1);
//再创建一组新的区间查询条件,这个条件它要加(),所以你要重新通过 example对象获取
example.and().andGreaterThanOrEqualTo("saleprice",0).andLessThanOrEqualTo("saleprice",100);
List<TProduct> tProducts = productMapper.selectByExample(example);
for (TProduct tProduct : tProducts) {
System.out.println(tProduct);
}
}
@Test //分页查询
public void queryByPage(){
//不带条件的分页查询
//如果要进行分页查询,只需在调用查询的方法前,设置分页参数即可
//特点注意:当前设置的分页参数,只适用于离它最近的这条查询
PageHelper.startPage(1,3);
//List<TProduct> tProducts = productMapper.selectAll();
PageInfo<TProduct> pageInfo = new PageInfo<>(productMapper.selectAll());
/*
pageInfo中的常用的方法:
总记录数:pageInfo.getTotal()
总页数:pageInfo.getPages()
每页的数据列表:pageInfo.getList()
*/
System.out.println(pageInfo);
}
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4.5 添加数据后,立马得到添加数据的主键
- 当前这个主键是由数据库进行【自增长】设置的
- 在实体类的主键ID上添加如下配置
public class TProduct {
@Id //指定主键的注解
@GeneratedValue(strategy= GenerationType.IDENTITY)
private Long id;
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- 在需要获取的地方,直接调用get方法即可
@Test //添加新数据后,获取 自增长主键 public void insertAndGetId(){ TProduct product = new TProduct(); product.setName("我是测试的"); product.setCreatetime(new Date()); product.setState(1L); productMapper.insert(product); System.out.println(product.getId()); }
原文章:https://blog.csdn.net/x286129277/article/details/112095082