image.png
数据库
CREATE TABLE `author` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`username` varchar(255) NOT NULL,
`password` varchar(255) NOT NULL,
`email` varchar(255) NOT NULL,
`bio` text,
`favourite_section` varchar(25) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=115 DEFAULT CHARSET=utf8;
实体
package com.ghgcn.mybatis_demo.entity;
import java.util.Arrays;
public class Author {
private Integer id;
private String username;
private String password;
private String email;
private Integer[] bio;
private String favouriteSection;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public Integer[] getBio() {
return bio;
}
public void setBio(Integer[] bio) {
this.bio = bio;
}
public String getFavouriteSection() {
return favouriteSection;
}
public void setFavouriteSection(String favouriteSection) {
this.favouriteSection = favouriteSection;
}
@Override
public String toString() {
StringBuilder builder = new StringBuilder();
builder.append("Author [");
if (id != null)
builder.append("id=")
.append(id)
.append(", ");
if (username != null)
builder.append("username=")
.append(username)
.append(", ");
if (password != null)
builder.append("password=")
.append(password)
.append(", ");
if (email != null)
builder.append("email=")
.append(email)
.append(", ");
if (bio != null)
builder.append("bio=")
.append(Arrays.toString(bio))
.append(", ");
if (favouriteSection != null)
builder.append("favouriteSection=")
.append(favouriteSection);
builder.append("]");
return builder.toString();
}
}
工具类
package com.ghgcn.mybatis_demo.helper;
public class StringHelper {
/**
* 将数组使用分隔符变为字符串
*
* @param array
* @param separator
* @return
*/
public static String join(Object[] array, String separator) {
return join(array, 0, array.length, separator);
}
private static String join(Object[] array, int startIndex, int endIndex, String separator) {
if (separator == null) {
return "";
}
StringBuilder sb = new StringBuilder();
for (int i = startIndex; i < endIndex; i++) {
/**
* 在前面加，就不会出瑞最后多一个分隔符的现象同时判断不是第一个才加分隔符
*/
if (i > startIndex) {
sb.append(separator);
}
if (array[i] != null) {
sb.append(array[i]);
}
}
return sb.toString();
}
public static void main(String[] args) {
Integer[] arrays = { 1,2,3,4,5,6,7 };
String join = join(arrays, ",");
System.out.println(join);// 1,2,3,4,5,6,7
}
}
handler
package com.ghgcn.mybatis_demo.handler;
import java.sql.CallableStatement;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import org.apache.ibatis.type.BaseTypeHandler;
import org.apache.ibatis.type.JdbcType;
import org.apache.ibatis.type.MappedJdbcTypes;
import org.apache.ibatis.type.MappedTypes;
import com.ghgcn.mybatis_demo.helper.StringHelper;
/**
* Mybatis数组转字符串a,b,c,d,e
*
* @author 刘楠
*/
@MappedTypes(value = { Integer[].class,Short[].class,Long[].class })
@MappedJdbcTypes(value = JdbcType.VARCHAR)
public class IntArrayJoinTypeHandler extends BaseTypeHandler {
String split = ",";
@Override
public void setNonNullParameter(PreparedStatement ps, int i, Integer[] parameter, JdbcType jdbcType)
throws SQLException {
ps.setString(i, StringHelper.join(parameter, split));
}
@Override
public Integer[] getNullableResult(ResultSet rs, String columnName) throws SQLException {
String reString = rs.getString(columnName);
if (reString != null && reString.length() > 0) {
String[] arrs = reString.split(split);
List idList = new ArrayList<>(arrs.length);
for (String id : arrs) {
if (id != null && id.length() > 0) {
idList.add(Integer.valueOf(id));
}
}
return idList.toArray(new Integer[idList.size()]);
}
return null;
}
@Override
public Integer[] getNullableResult(ResultSet rs, int columnIndex) throws SQLException {
String reString = rs.getString(columnIndex);
if (reString != null && reString.length() > 0) {
String[] arrs = reString.split(split);
List idList = new ArrayList<>(arrs.length);
for (String id : arrs) {
if (id != null && id.length() > 0) {
idList.add(Integer.valueOf(id));
}
}
return idList.toArray(new Integer[idList.size()]);
}
return null;
}
@Override
public Integer[] getNullableResult(CallableStatement cs, int columnIndex) throws SQLException {
String reString = cs.getString(columnIndex);
if (reString != null && reString.length() > 0) {
String[] arrs = reString.split(split);
List idList = new ArrayList<>(arrs.length);
for (String id : arrs) {
if (id != null && id.length() > 0) {
idList.add(Integer.valueOf(id));
}
}
return idList.toArray(new Integer[idList.size()]);
}
return null;
}
}
配置
mapper
id,username,password,email,bio,favourite_section
INSERT INTO author (
username,
password,
email,
bio,
favourite_section
)
VALUES
(
#{username},
#{password},
#{email},
#{bio},
#{favouriteSection}
);
update author
username=#{username},
password=#{password},
email=#{email},
bio=#{bio},
favourite_section=#{favouriteSection},
id=#{id}
测试
package com.ghgcn.mybatis_demo.test01;
import java.io.IOException;
import java.io.InputStream;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import com.ghgcn.mybatis_demo.entity.Author;
import com.ghgcn.mybatis_demo.mapper.AuthorMapper;
public class AuthormapperTest1 {
public static void main(String[] args) throws IOException {
String resource = "mybatis/mybatis-config.xml";
InputStream inputStream = Resources.getResourceAsStream(resource);
SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
SqlSession sqlSession = sessionFactory.openSession(true);
AuthorMapper authorMapper = sqlSession.getMapper(AuthorMapper.class);
Author insertAuthor = new Author();
insertAuthor.setBio(new Integer[]{ 1,2,3,4,5,6,7,8,9,10,11,22,33,44 });
insertAuthor.setEmail("[email protected]");
insertAuthor.setFavouriteSection("13800138000");
insertAuthor.setPassword("13800138000");
insertAuthor.setUsername("13800138000");
int insert = authorMapper.insert(insertAuthor);
System.out.println("insert" + (insert > 0));
Author byId = authorMapper.getById(110);
System.out.println("byId:" + byId);
// Author [id=110, username=13800138000, password=13800138000, [email protected], bio=[1, 2, 3, 4, 5, 6, 7, 8, 9,
// 10, 11, 22], favouriteSection=13800138000]
}
}
image.png
这样写入的时候是数组，在数据库中为字符串，
查询出来的时候又转成数组