mybatis怎样批量插入数据到oracle，就算id自动增长问题

Posted 2023-05-06

1、oracle的自动增长是靠一个序列sequence

2、所以你要先生成一个序列，起始值为0或者1，多少可以自己决定，插入的时候，

序列名..nextVal  

插入

创建序列

参考技术A @Transactional
public void ss(List<User> list)
for(User u : list)
dao.insert(u);




这样就批量了，mysql的insert into user values (), () 其实是mysql特有的一个插入变种，根本没有批量啦，是单个语句.

Java通过Mybatis实现批量插入数据到Oracle中

最近项目中遇到一个问题：导入数据到后台并将数据插入到数据库中，导入的数据量有上万条数据，考虑采用批量插入数据的方式；

结合网上资料，写了个小demo，文章末尾附上demo下载地址

1、新建项目：项目目录结构如下图所示，添加相应的jar包

　　　　　　

2、新建数据库表：ACCOUNT_INFO

　　

1 CREATE TABLE ACCOUNT_INFO (
2     "ID" NUMBER(12) NOT NULL ,
3     "USERNAME" VARCHAR2(64 BYTE) NULL ,
4     "PASSWORD" VARCHAR2(64 BYTE) NULL ,
5     "GENDER" CHAR(1 BYTE) NULL ,
6     "EMAIL" VARCHAR2(64 BYTE) NULL ,
7     "CREATE_DATE" DATE NULL 
8 )

3、创建AccountInfo实体类：

 1 package com.oracle.entity;
 2 
 3 import java.sql.Date;
 4 
 5 public class AccountInfo {
 6     private Long id;
 7     private String userName;
 8     private String password;
 9     private String gender;
10     private String email;
11     private Date createDate;
12 
13     public Long getId() {
14         return id;
15     }
16 
17     public void setId(Long id) {
18         this.id = id;
19     }
20 
21     public String getUserName() {
22         return userName;
23     }
24 
25     public void setUserName(String userName) {
26         this.userName = userName;
27     }
28 
29     public String getPassword() {
30         return password;
31     }
32 
33     public void setPassword(String password) {
34         this.password = password;
35     }
36 
37     public String getGender() {
38         return gender;
39     }
40 
41     public void setGender(String gender) {
42         this.gender = gender;
43     }
44 
45     public String getEmail() {
46         return email;
47     }
48 
49     public void setEmail(String email) {
50         this.email = email;
51     }
52 
53     public Date getCreateDate() {
54         return createDate;
55     }
56 
57     public void setCreateDate(Date createDate) {
58         this.createDate = createDate;
59     }
60 
61     @Override
62     public String toString() {
63         return "AccountInfo [id=" + id + ", userName=" + userName
64                 + ", password=" + password + ", gender=" + gender + ", email="
65                 + email + ", createDate=" + createDate + "]";
66     }
67 
68 }

4、新建接口映射类：AccountInfoMapper.java

 1 package com.oracle.mapper;
 2 
 3 import java.util.List;
 4 
 5 import com.oracle.entity.AccountInfo;
 6 
 7 public interface AccountInfoMapper {
 8     /**
 9      * 查询所有的数据
10      * @return
11      */
12     List<AccountInfo> queryAllAccountInfo();
13     
14     /**
15      * 批量插入数据
16      * 
17      * @param accountInfoList
18      * @return
19      */
20     int batchInsertAccountInfo(List<AccountInfo> accountInfoList);
21 }

 

5、创建mybatis配置文件：mybatis-configuration.xml

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
 3 <configuration>
 4     <environments default="development">
 5         <environment id="development">
 6             <transactionManager type="JDBC" />
 7             <dataSource type="POOLED">
 8                 <property name="driver" value="oracle.jdbc.driver.OracleDriver" />
 9                 <property name="url" value="jdbc:oracle:thin:@localhost:1521:orcl" />
10                 <property name="username" value="xxx" />
11                 <property name="password" value="xxx" />
12             </dataSource>
13         </environment>
14     </environments>
15     <mappers>
16         <mapper resource="config/AccountInfoMapper.xml" />
17     </mappers>
18 </configuration>

6、创建接口映射配置文件：AccountInfoMapper.xml

Oracle的批量插入数据库跟MySQL不一样，

MySQL：

INSERT INTO ACCOUNT_INFO(ID, USERNAME,PASSWORD,GENDER, EMAIL,CREATE_DATE)values(,,,,,,)(,,,,,,,)

Oracle：

INSERT INTO ACCOUNT_INFO(ID, USERNAME,PASSWORD,GENDER, EMAIL,CREATE_DATE) (select 1,,,,,, from dual union all select 1,,,,,, from dual)

　

 1 <?xml version="1.0" encoding="UTF-8" ?>
 2 <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
 3 <mapper namespace="com.oracle.mapper.AccountInfoMapper"><!--  接口的全类名 -->
 4     <!-- type:实体类的全类名 -->
 5     <resultMap id="BaseResultMap" type="com.oracle.entity.AccountInfo">
 6         <id column="ID" property="id" jdbcType="DECIMAL" />
 7         <result column="USERNAME" property="userName" jdbcType="VARCHAR" />
 8         <result column="PASSWORD" property="password" jdbcType="VARCHAR" />
 9         <result column="GENDER" property="gender" jdbcType="CHAR" />
10         <result column="EMAIL" property="email" jdbcType="VARCHAR" />
11         <result column="CREATE_DATE" property="createDate" jdbcType="DATE" />
12     </resultMap>
13     <!-- id 跟接口中的方法名称保持一致 -->
14     <select id="queryAllAccountInfo" resultMap="BaseResultMap">
15         select ID,
16         USERNAME,PASSWORD,
17         GENDER, EMAIL, CREATE_DATE from ACCOUNT_INFO
18     </select>
19     <insert id="batchInsertAccountInfo" parameterType="java.util.List">
20         INSERT INTO ACCOUNT_INFO(ID, USERNAME,PASSWORD,GENDER, EMAIL,CREATE_DATE)
21         (
22         <foreach collection="list" index="" item="accountInfo"
23             separator="union all">
24             select
25             #{accountInfo.id},
26             #{accountInfo.userName},
27             #{accountInfo.password},
28             #{accountInfo.gender},
29             #{accountInfo.email},
30             #{accountInfo.createDate}
31             from dual
32         </foreach>
33         )
34     </insert>
35 </mapper>

7、编写测试类：

 1 package com.oracle.test;
 2 
 3 import java.io.InputStream;
 4 import java.sql.Date;
 5 import java.util.ArrayList;
 6 import java.util.List;
 7 
 8 import org.apache.ibatis.io.Resources;
 9 import org.apache.ibatis.session.SqlSession;
10 import org.apache.ibatis.session.SqlSessionFactory;
11 import org.apache.ibatis.session.SqlSessionFactoryBuilder;
12 
13 import com.oracle.entity.AccountInfo;
14 import com.oracle.mapper.AccountInfoMapper;
15 
16 public class MybatisTest {
17     public static void main(String[] args) throws Exception {
18         String resource = "config/mybatis-configuration.xml";
19         InputStream inputStream = Resources.getResourceAsStream(resource);
20         SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder()
21                 .build(inputStream);
22         SqlSession session = sessionFactory.openSession();
23         AccountInfoMapper mapper = session.getMapper(AccountInfoMapper.class);
24         List<AccountInfo> accountInfoList = mapper.queryAllAccountInfo();
25         if (accountInfoList == null) {
26             System.out.println("The result is null.");
27         } else {
28             for (AccountInfo personInfo : accountInfoList) {
29                 System.out.println(personInfo);
30             }
31         }
32         mapper.batchInsertAccountInfo(generateData());
33         session.commit();
34     }
35     
36     static List<AccountInfo> generateData(){
37         List<AccountInfo> result = new ArrayList<AccountInfo>();
38         AccountInfo account = new AccountInfo();
39         account.setId(3L);
40         account.setUserName("zhangsanfeng");
41         account.setPassword("123456");
42         account.setGender("1");
43         account.setEmail("[email protected]");
44         account.setCreateDate(new Date(System.currentTimeMillis()));
45         result.add(account);
46         
47         account = new AccountInfo();
48         account.setId(4L);
49         account.setUserName("zhouzhiruo");
50         account.setPassword("zhangwuji");
51         account.setGender("0");
52         account.setEmail("[email protected]");
53         account.setCreateDate(new Date(System.currentTimeMillis()));
54         result.add(account);
55         
56         account = new AccountInfo();
57         account.setId(5L);
58         account.setUserName("zhaomin");
59         account.setPassword("zhangwuji");
60         account.setGender("0");
61         account.setEmail("[email protected]");
62         account.setCreateDate(new Date(System.currentTimeMillis()));
63         result.add(account);
64         return result;
65     }
66 }

 项目下载地址：http://download.csdn.net/detail/clqyhy/9553854