老司机学习MyBatis之动态SQL使用foreach在Oracle中批量插入

一、前言

前面一节，我们讲解了在MySQL下如何通过foreach批量插入数据，这一节，我们将介绍在Oracle下批量插入数据，也有两种方式。

二、案例

完整的工程目录结构如下

在Oracle下创建数据库表t_emp，并创建序列

CREATE TABLE t_emp (
  id number(10) NOT NULL,
  emp_name varchar(50) DEFAULT NULL,
  emp_email varchar(50) DEFAULT NULL,
  dept_id number(10) DEFAULT NULL,
  PRIMARY KEY (id)
);
==========================
create sequence SEQ_T_EMP_ID
   minvalue 1
   maxvalue 9999999999999999999999999999
   start with 1
   increment by 1
   cache 20;

在mybatis-config.xml文件中增加Oracle数据源配置

<environment id="dev_oracle">
	<transactionManager type="JDBC" />
	<dataSource type="POOLED">
		<property name="driver" value="${oracle.driver}" />
		<property name="url" value="${oracle.url}" />
		<property name="username" value="${oracle.username}" />
		<property name="password" value="${oracle.password}" />
	</dataSource>
</environment>

修改db.properties配置文件，增加Oracle配置信息

oracle.driver=oracle.jdbc.driver.OracleDriver
oracle.url=jdbc:oracle:thin:@localhost:1521:orcl
oracle.username=SCOTT
oracle.password=SCOTT

Emp实体类

public class Emp {
	// ID，唯一性
	private Integer id;
	// 用户名
	private String empName;
	// 用户名
	private String empEmail;
	// 部门ID
	private Integer deptId;

	public Emp() {

	}

	public Emp(Integer id, String empName, String empEmail, Integer deptId) {
		this.id = id;
		this.empName = empName;
		this.empEmail = empEmail;
		this.deptId = deptId;
	}

	public Integer getId() {
		return id;
	}

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

	public String getEmpName() {
		return empName;
	}

	public void setEmpName(String empName) {
		this.empName = empName;
	}

	public String getEmpEmail() {
		return empEmail;
	}

	public void setEmpEmail(String empEmail) {
		this.empEmail = empEmail;
	}

	public Integer getDeptId() {
		return deptId;
	}

	public void setDeptId(Integer deptId) {
		this.deptId = deptId;
	}

	@Override
	public String toString() {
		return "Emp [id=" + id + ", empName=" + empName + ", empEmail="
				+ empEmail + ", deptId=" + deptId + "]";
	}

}

EmpMapper接口类

public interface EmpMapper {
	
	/**
	 * 根据部门ID查询该部门下的所有员工信息
	 * @param id
	 * @return
	 */
	public Emp batchSaveEmps(Emp emp);
}

新建UserMapper.xml文件，批量操作的主要核心代码配置在这个文件里面

新建MyBatisTest文件，增加testBatchSaveEmps方法

@Test
public void testBatchSaveEmps() throws IOException {
	SqlSessionFactory sqlSessionFactory = getSqlSessionFactory();
	SqlSession openSession = sqlSessionFactory.openSession();
	try {
		EmpMapper mapper = openSession.getMapper(EmpMapper.class);
		List<Emp> empList = new ArrayList<Emp>();
		empList.add(new Emp(null,"Lucy","[email protected]",1));
		empList.add(new Emp(null,"Lily","[email protected]",2));
		empList.add(new Emp(null,"Lizy","[email protected]",3));
		mapper.batchSaveEmps(empList);
		openSession.commit();
	} finally {
		openSession.close();
	}
}

测试控制台打印结果如下

2017-08-13 18:12:17,569 [main] [com.queen.mybatis.mapper.EmpMapper.batchSaveEmps]-[DEBUG] ==>  Preparing: begin insert into t_emp(id,emp_name,emp_email,dept_id) values (SEQ_T_EMP_ID.nextval, ?, ?, ?); insert into t_emp(id,emp_name,emp_email,dept_id) values (SEQ_T_EMP_ID.nextval, ?, ?, ?); insert into t_emp(id,emp_name,emp_email,dept_id) values (SEQ_T_EMP_ID.nextval, ?, ?, ?); end; 
2017-08-13 18:12:17,722 [main] [com.queen.mybatis.mapper.EmpMapper.batchSaveEmps]-[DEBUG] ==> Parameters: Lucy(String), [email protected](String), 1(Integer), Lily(String), [email protected](String), 2(Integer), Lizy(String), [email protected](String), 3(Integer)

查询数据库看是否插入成功

SQL> select * from T_EMP t;
 
 ID EMP_NAME            EMP_EMAIL                  DEPT_ID
---- ---------------------------------- -----------------------
 4   Lucy              [email protected]                 1
 5   Lily              [email protected]                 2
 6   Lizy              [email protected]                 3

如上，是Oracle的第一种批量插入方式，接下来我们介绍第二种批量插入方式

第二种方式，这个过程中要采用中间表的方式

修改UserMapper.xml文件

测试，控制台打印结果如下

2017-08-13 18:29:07,103 [main] [com.queen.mybatis.mapper.EmpMapper.batchSaveEmps]-[DEBUG] ==>  Preparing: insert into t_emp(id,emp_name,emp_email,dept_id) select SEQ_T_EMP_ID.nextval, empName, empEmail, deptId from( select ? empName, ? empEmail, ? deptId from dual union select ? empName, ? empEmail, ? deptId from dual union select ? empName, ? empEmail, ? deptId from dual ) 
2017-08-13 18:29:07,262 [main] [com.queen.mybatis.mapper.EmpMapper.batchSaveEmps]-[DEBUG] ==> Parameters: Lucy123(String), [email protected](String), 1(Integer), Lily123(String), [email protected](String), 2(Integer), Lizy123(String), [email protected](String), 3(Integer)
2017-08-13 18:29:07,267 [main] [com.queen.mybatis.mapper.EmpMapper.batchSaveEmps]-[DEBUG] <==    Updates: 3

注意：pom文件中要加入Oracle的maven依赖

<dependency>
	<groupId>com.oracle</groupId>
	<artifactId>ojdbc14</artifactId>
	<version>10.2.0.1.0</version>
</dependency>

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