1 简介
DB2是IBM的一款优秀的关系型数据库，简单学习一下。
2 Docker安装DB2
为了快速启动，直接使用Docker来安装DB2。先下载镜像如下：
docker pull ibmcom/db2:11.5.0.0
启动数据库如下：
docker run -itd \
--name mydb2 \
--privileged=true \
-p 50000:50000 \
-e LICENSE=accept \
-e DB2INST1_PASSWORD=pkslow \
-e DBNAME=testdb \
ibmcom/db2:11.5.0.0
这样获得的数据库，具体信息如下：
连接URL：jdbc:db2://localhost:50000/testdb
用户名：db2inst1
密码：pkslow
在IDEA上连接如下：
默认的Schema为DB2INST1，测试SQL如下：
创建表：
CREATE TABLE EMPLOYEE_SALARY
(DEPTNO CHAR(3) NOT NULL,
DEPTNAME VARCHAR(36) NOT NULL,
EMPNO CHAR(6) NOT NULL,
SALARY DECIMAL(9,2) NOT NULL WITH DEFAULT);
插入数据：
INSERT INTO EMPLOYEE_SALARY (DEPTNO, DEPTNAME, EMPNO, SALARY) VALUES ('001', 'IT', '001322', 80000.00);
INSERT INTO EMPLOYEE_SALARY (DEPTNO, DEPTNAME, EMPNO, SALARY) VALUES ('001', 'IT', '001323', 20000.00);
INSERT INTO EMPLOYEE_SALARY (DEPTNO, DEPTNAME, EMPNO, SALARY) VALUES ('002', 'Architecture', '001324', 3220.00);
INSERT INTO EMPLOYEE_SALARY (DEPTNO, DEPTNAME, EMPNO, SALARY) VALUES ('002', 'Architecture', '001325', 8000.00);
INSERT INTO EMPLOYEE_SALARY (DEPTNO, DEPTNAME, EMPNO, SALARY) VALUES ('003', 'Front Office', '001326', 13320.00);
INSERT INTO EMPLOYEE_SALARY (DEPTNO, DEPTNAME, EMPNO, SALARY) VALUES ('001', 'IT', '001327', 5433.00);
查询：
SELECT * FROM DB2INST1.EMPLOYEE_SALARY;
Spring Boot整合DB2
添加相关依赖：
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>com.ibm.db2</groupId>
<artifactId>jcc</artifactId>
<version>11.5.0.0</version>
</dependency>
</dependencies>
配置相关属性：
server.port=8082
spring.datasource.url=jdbc:db2://localhost:50000/testdb
spring.datasource.username=db2inst1
spring.datasource.password=pkslow
spring.jpa.generate-ddl=true
创建Entity：
package com.pkslow.springboot.jpa.db2.entity;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
@Entity
@Data
@AllArgsConstructor
@NoArgsConstructor
@Table(name = "EMPLOYEE", schema = "DB2INST1")
public class Employee {
@Id
private Long id;
private String name;
}
创建Repository类用于操作数据库：
public interface EmployeeRepository extends CrudRepository<Employee, Long> {
}
最后，写个方法测试一下：
@Configuration
@Slf4j
public class TestConfig {
@Autowired
private EmployeeRepository repository;
@PostConstruct
public void init() {
Employee employee1 = new Employee(1L, "Larry Deng");
Employee employee2 = new Employee(2L, "LarryDpk");
Employee employee3 = new Employee(3L, "Pkslow");
repository.deleteAll();
repository.save(employee1);
repository.save(employee2);
repository.save(employee3);
List<Employee> employees = StreamSupport.stream(repository.findAll().spliterator(), false)
.collect(Collectors.toList());
employees.forEach(e -> log.info(e.toString()));
}
}
启动后，日志打印正常如下：
2022-02-28 23:26:22.476 INFO 60847 --- [ main] c.pkslow.springboot.jpa.db2.TestConfig : Employee(id=1, name=Larry Deng)
2022-02-28 23:26:22.476 INFO 60847 --- [ main] c.pkslow.springboot.jpa.db2.TestConfig : Employee(id=2, name=LarryDpk)
2022-02-28 23:26:22.476 INFO 60847 --- [ main] c.pkslow.springboot.jpa.db2.TestConfig : Employee(id=3, name=Pkslow)
表数据如下：
代码
代码请看GitHub: https://github.com/LarryDpk/pkslow-samples
References：
