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：
Docker Image
Statements Insert
PS：Docker中安装DB2详细教程
docker安装db2 1、查询可安装的db2镜像2、下载db2镜像3、安装镜像4、切换用户并运行DB25、常用命令6、遇到的坑7、参考文章 1、查询可安装的db2镜像
这里是单机安装，直接安装db2express-c，介绍网址 : libmcom / db2express-c
docker search db2express-c1
2、下载db2镜像
docker pull ibmoms/db2express-c这里我选用的是ibmoms/db2express-c，尝试过网上教程上的很多镜像，安装完之后都有坑-_-||。
3、安装镜像
docker run -it --name db2 -p 50000:50000 -e DB2INST1_PASSWORD=db2 -e LICENSE=accept ibmoms/db2express-c:latest bash-p 50000:50000 允许远程的客户端可以从50000 端口连接到数据库实例.通过指定 -e DB2INST1_PASSWORD=db2root-pwd 参数, 你可以为缺省的Db2实例用户db2inst1设置密码.注意：这里“DB2INST1”是用户名，而“b2root-pwd”是密码。通过指定-e LICENSE=accept参数, 表示你接受了使用Db2软件的许可证协议.
有教程说要添加 –network=host ，我在添加后各种莫名的报错╮(╯▽╰)╭
4、切换用户并运行DB2
$ su - db2inst1 //切换用户
$ db2start //启动DB2
$ db2sampl //创建默认数据库“SAMPLE”5、常用命令
db2 create db [dbname] #创建数据库
db2 list db directory #列出所有数据库
db2 list active databases #列出所有激活的数据库
db2 get db cfg #列出所有数据库配置 6、遇到的坑
1.DB2 启动SQL5043N
解决方案: DB2 启动SQL5043N
官方解答: infocenter答案
[db2inst1@connections ~]$ db2level
DB21085I This instance or install (instance name, where applicable:
“db2inst1”) uses “64” bits and DB2 code release “SQL10014” with level
identifier “0205010E”.
Informational tokens are “DB2 v10.1.0.4”, “s140509”, “IP23584”, and Fix Pack
“4”.
Product is installed at “/opt/ibm/db2/V10.1”.
[db2inst1@connections ~]$ db2start
08/20/2014 22:19:54 0 0 SQL5043N Support for one or more communications protocols specified in the DB2COMM environment variable failed to start successfully. However, core database manager functionality started successfully.
SQL1063N DB2START processing was successful.
[db2inst1@connections ~]$ db2set DB2COMM=tcpip[db2inst1@connections ~]$ db2stop
2014-08-20 22:21:17 0 0 SQL1064N DB2STOP processing was successful.
SQL1064N DB2STOP processing was successful.
[db2inst1@connections ~]$ db2start
08/20/2014 22:21:20 0 0 SQL5043N Support for one or more communications protocols specified in the DB2COMM environment variable failed to start successfully. However, core database manager functionality started successfully.
SQL1063N DB2START processing was successful.
[db2inst1@connections ~]$ db2 get dbm cfg
这里重点看SVCENAME属性,修改命令：db2 update dbm cfg using SVCENAME 50000
[db2inst1@connections ~]$ db2 update dbm cfg using SVCENAME 50000
DB20000I The UPDATE DATABASE MANAGER CONFIGURATION command completed
successfully.
[db2inst1@connections ~]$ db2stop
2014-08-20 22:22:07 0 0 SQL1064N DB2STOP processing was successful.
SQL1064N DB2STOP processing was successful.
启动成功
[db2inst1@connections ~]$ db2start
08/20/2014 22:22:11 0 0 SQL1063N DB2START processing was successful.
SQL1063N DB2START processing was successful.
[db2inst1@connections ~]$ db2 get dbm cfg | grep SVC
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