mybatis sql中使用<或<=时报错SAXParseException

Thu, 10 Oct 2019 00:00:00 +0000

使用mybatis时，当sql中使用<或<=时：

SELECT * FROM user WHERE age < 36
SELECT * FROM user WHERE age <= 36

会报错SAXParseException: 元素内容必须由格式正确的字符数据或标记组成。

org.apache.ibatis.builder.BuilderException: Error creating document instance.  Cause: org.xml.sax.SAXParseException; lineNumber: 7; columnNumber: 37; 元素内容必须由格式正确的字符数据或标记组成。
	at org.mybatis.spring.SqlSessionFactoryBean.buildSqlSessionFactory(SqlSessionFactoryBean.java:596) ~[mybatis-spring-2.0.2.jar:2.0.2]
	at org.mybatis.spring.SqlSessionFactoryBean.afterPropertiesSet(SqlSessionFactoryBean.java:475) ~[mybatis-spring-2.0.2.jar:2.0.2]
	at org.mybatis.spring.SqlSessionFactoryBean.getObject(SqlSessionFactoryBean.java:616) ~[mybatis-spring-2.0.2.jar:2.0.2]
	at org.mybatis.spring.boot.autoconfigure.MybatisAutoConfiguration.sqlSessionFactory(MybatisAutoConfiguration.java:180) ~[mybatis-spring-boot-autoconfigure-2.1.0.jar:2.1.0]
	at org.mybatis.spring.boot.autoconfigure.MybatisAutoConfiguration$$EnhancerBySpringCGLIB$$9adef889.CGLIB$sqlSessionFactory$1(<generated>) ~[mybatis-spring-boot-autoconfigure-2.1.0.jar:2.1.0]
	at org.mybatis.spring.boot.autoconfigure.MybatisAutoConfiguration$$EnhancerBySpringCGLIB$$9adef889$$FastClassBySpringCGLIB$$abadc28a.invoke(<generated>) ~[mybatis-spring-boot-autoconfigure-2.1.0.jar:2.1.0]
	at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:244) ~[spring-core-5.1.9.RELEASE.jar:5.1.9.RELEASE]
	at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:363) ~[spring-context-5.1.9.RELEASE.jar:5.1.9.RELEASE]
	at org.mybatis.spring.boot.autoconfigure.MybatisAutoConfiguration$$EnhancerBySpringCGLIB$$9adef889.sqlSessionFactory(<generated>) ~[mybatis-spring-boot-autoconfigure-2.1.0.jar:2.1.0]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_172]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_172]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_172]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_172]
	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) ~[spring-beans-5.1.9.RELEASE.jar:5.1.9.RELEASE]
	... 44 common frames omitted
Caused by: org.apache.ibatis.builder.BuilderException: Error creating document instance.  Cause: org.xml.sax.SAXParseException; lineNumber: 7; columnNumber: 37; 元素内容必须由格式正确的字符数据或标记组成。
	at org.apache.ibatis.parsing.XPathParser.createDocument(XPathParser.java:260) ~[mybatis-3.5.2.jar:3.5.2]
	at org.apache.ibatis.parsing.XPathParser.<init>(XPathParser.java:126) ~[mybatis-3.5.2.jar:3.5.2]
	at org.apache.ibatis.builder.xml.XMLMapperBuilder.<init>(XMLMapperBuilder.java:80) ~[mybatis-3.5.2.jar:3.5.2]
	at org.mybatis.spring.SqlSessionFactoryBean.buildSqlSessionFactory(SqlSessionFactoryBean.java:593) ~[mybatis-spring-2.0.2.jar:2.0.2]
	... 57 common frames omitted
Caused by: org.xml.sax.SAXParseException: 元素内容必须由格式正确的字符数据或标记组成。
	at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:203) ~[na:1.8.0_172]
	at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.fatalError(ErrorHandlerWrapper.java:177) ~[na:1.8.0_172]
	at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:400) ~[na:1.8.0_172]
	at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:327) ~[na:1.8.0_172]
	at com.sun.org.apache.xerces.internal.impl.XMLScanner.reportFatalError(XMLScanner.java:1472) ~[na:1.8.0_172]
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.startOfMarkup(XMLDocumentFragmentScannerImpl.java:2635) ~[na:1.8.0_172]
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2732) ~[na:1.8.0_172]
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:602) ~[na:1.8.0_172]
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:505) ~[na:1.8.0_172]
	at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:842) ~[na:1.8.0_172]
	at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:771) ~[na:1.8.0_172]
	at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141) ~[na:1.8.0_172]
	at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:243) ~[na:1.8.0_172]
	at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:339) ~[na:1.8.0_172]
	at org.apache.ibatis.parsing.XPathParser.createDocument(XPathParser.java:258) ~[mybatis-3.5.2.jar:3.5.2]
	... 60 common frames omitted

这是由于mybatis的SQL配置在XML中，一些特殊符号在XML解析时被转义。

springboot整合mybatis

Wed, 25 Sep 2019 00:00:00 +0000

添加Maven依赖

<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>RELEASE</version>
</dependency>

<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <scope>runtime</scope>
</dependency>

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid</artifactId>
    <version>RELEASE</version>
</dependency>

在application.yml中配置数据源和mybatis

server:
  port: 8080

spring:
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    url: jdbc:mysql://127.0.0.1:3306/test1?jdbcCompliantTruncation=false&allowMultiQueries=true&useUnicode=true&characterEncoding=UTF-8&serverTimezone=GMT
    driver-class-name: com.mysql.cj.jdbc.Driver
    username: root
    password: root

mybatis:
  mapper-locations: classpath:mapper/*.xml

mysql

CREATE TABLE `user` (
	`id` INT(11) UNSIGNED NOT NULL AUTO_INCREMENT,
	`name` VARCHAR(50) NULL DEFAULT NULL,
	`age` INT(11) UNSIGNED NULL DEFAULT NULL,
	PRIMARY KEY (`id`)
)
COLLATE='utf8_general_ci'
ENGINE=InnoDB
AUTO_INCREMENT=3;

INSERT INTO `user` (`id`, `name`, `age`) VALUES (1, 'alita', 23);
INSERT INTO `user` (`id`, `name`, `age`) VALUES (2, 'sofia', 33);

DAO

├─main
│  ├─java
│  │  └─top
│  │      └─guoj
│  │          └─springboot
│  │              ├─controller
│  │              ├─dao
│  │              ├─entity
│  │              └─service
│  └─resources
│      └─mapper

UserDao.java

package top.guoj.springboot.dao;

import org.apache.ibatis.annotations.Mapper;

import java.util.List;
import java.util.Map;

@Mapper
public interface UserDao {
	List<Map<String, Object>> getUser();
}

UserDao.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace="top.guoj.springboot.dao.UserDao">

    <select id="getUser" resultType="java.util.HashMap">
      select * from user;
    </select>

</mapper>

使用

package top.guoj.springboot.controller;

import com.alibaba.fastjson.JSONObject;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import top.guoj.springboot.dao.UserDao;

import java.util.List;
import java.util.Map;

@RestController
public class HelloController {

	@Autowired
	private UserDao userDao;

	@RequestMapping("/mybatis")
	String mybatis() {
		List<Map<String, Object>> users = userDao.getUser();
		return JSONObject.toJSONString(users);
	}
}

Mybatis on Coding

mybatis sql中使用<或<=时报错SAXParseException

springboot整合mybatis

添加Maven依赖

在application.yml中配置数据源和mybatis

mysql

DAO

UserDao.java

UserDao.xml

使用