pom.xml<\/p>\n\n\n\n
<project xmlns=\"http:\/\/maven.apache.org\/POM\/4.0.0\" xmlns:xsi=\"http:\/\/www.w3.org\/2001\/XMLSchema-instance\"\n xsi:schemaLocation=\"http:\/\/maven.apache.org\/POM\/4.0.0 http:\/\/maven.apache.org\/xsd\/maven-4.0.0.xsd\">\n <modelVersion>4.0.0<\/modelVersion>\n\n <groupId>top.qaqaq.mybatis<\/groupId>\n <artifactId>MyBatis_demo2<\/artifactId>\n <version>1.0-SNAPSHOT<\/version>\n <packaging>jar<\/packaging>\n\n <name>MyBatis_demo2<\/name>\n <url>http:\/\/maven.apache.org<\/url>\n\n <properties>\n <project.build.sourceEncoding>UTF-8<\/project.build.sourceEncoding>\n <\/properties>\n\n <dependencies>\n <dependency>\n <groupId>junit<\/groupId>\n <artifactId>junit<\/artifactId>\n <version>3.8.1<\/version>\n <scope>test<\/scope>\n <\/dependency>\n\n <!-- Mybatis\u6838\u5fc3 -->\n <dependency>\n <groupId>org.mybatis<\/groupId>\n <artifactId>mybatis<\/artifactId>\n <version>3.5.7<\/version>\n <\/dependency>\n <!-- junit\u6d4b\u8bd5 -->\n <dependency>\n <groupId>junit<\/groupId>\n <artifactId>junit<\/artifactId>\n <version>4.12<\/version>\n <scope>test<\/scope>\n <\/dependency>\n <!-- MySQL\u9a71\u52a8 -->\n <dependency>\n <groupId>mysql<\/groupId>\n <artifactId>mysql-connector-java<\/artifactId>\n <version>8.0.31<\/version>\n <\/dependency>\n <!-- log4j\u65e5\u5fd7 -->\n <dependency>\n <groupId>log4j<\/groupId>\n <artifactId>log4j<\/artifactId>\n <version>1.2.17<\/version>\n <\/dependency>\n\n <\/dependencies>\n<\/project>\n<\/code><\/pre>\n\n\n\nresources<\/p>\n\n\n\n
mybatis-config.xml<\/p>\n\n\n\n
<?xml version=\"1.0\" encoding=\"UTF-8\" ?>\n<!DOCTYPE configuration\n PUBLIC \"-\/\/mybatis.org\/\/DTD Config 3.0\/\/EN\"\n \"http:\/\/mybatis.org\/dtd\/mybatis-3-config.dtd\">\n<configuration>\n\n <properties resource=\"jdbc.properties\" \/>\n\n <typeAliases>\n <package name=\"top.qaqaq.mybatis.pojo\"\/>\n <\/typeAliases>\n\n <environments default=\"development\">\n <environment id=\"development\">\n <transactionManager type=\"JDBC\"\/>\n <dataSource type=\"POOLED\">\n <property name=\"driver\" value=\"${jdbc.driver}\"\/>\n <property name=\"url\" value=\"${jdbc.url}\"\/>\n <property name=\"username\" value=\"${jdbc.username}\"\/>\n <property name=\"password\" value=\"${jdbc.password}\"\/>\n <\/dataSource>\n <\/environment>\n <\/environments>\n\n <mappers>\n <package name=\"top.qaqaq.mybatis.mapper\"\/>\n <\/mappers>\n<\/configuration><\/code><\/pre>\n\n\n\njdbc.properties<\/p>\n\n\n\n
jdbc.driver=com.mysql.cj.jdbc.Driver\njdbc.url=jdbc:mysql:\/\/localhost:3306\/mybatis\njdbc.username=root\njdbc.password=123456\n<\/code><\/pre>\n\n\n\nlog4j.xml<\/p>\n\n\n\n
<?xml version=\"1.0\" encoding=\"UTF-8\" ?>\n<!DOCTYPE log4j:configuration SYSTEM \"log4j.dtd\">\n<log4j:configuration xmlns:log4j=\"http:\/\/jakarta.apache.org\/log4j\/\">\n <appender name=\"STDOUT\" class=\"org.apache.log4j.ConsoleAppender\">\n <param name=\"Encoding\" value=\"UTF-8\" \/>\n <layout class=\"org.apache.log4j.PatternLayout\">\n <param name=\"ConversionPattern\" value=\"%-5p %d{MM-dd HH:mm:ss,SSS}%m (%F:%L) \\n\" \/>\n <\/layout>\n <\/appender>\n <logger name=\"java.sql\">\n <level value=\"debug\" \/>\n <\/logger>\n <logger name=\"org.apache.ibatis\">\n <level value=\"info\" \/>\n <\/logger>\n <root>\n <level value=\"debug\" \/>\n <appender-ref ref=\"STDOUT\" \/>\n <\/root>\n<\/log4j:configuration><\/code><\/pre>\n\n\n\nresources\/mapper<\/p>\n\n\n\n
SelectMapper.xml<\/strong><\/h3>\n\n\n\n<?xml version=\"1.0\" encoding=\"UTF-8\" ?>\n<!DOCTYPE mapper\n PUBLIC \"-\/\/mybatis.org\/\/DTD Mapper 3.0\/\/EN\"\n \"http:\/\/mybatis.org\/dtd\/mybatis-3-mapper.dtd\">\n<mapper namespace=\"top.qaqaq.mybatis.mapper.SelectMapper\">\n\n <!--User getUserById(@Param(\"id\") Integer id);-->\n <select id=\"getUserById\" resultType=\"User\">\n select * from t_user where id = #{id}\n <\/select>\n\n <!--List<User> getAllUser();-->\n <select id=\"getAllUser\" resultType=\"User\">\n select * from t_user\n <\/select>\n \n <!--Integer getCount();-->\n <select id=\"getCount\" resultType=\"_int\">\n select count(*) from t_user\n <\/select>\n \n <!--Map<String, Object> getUserByIdToMap(@Param(\"id\") Integer id);-->\n <select id=\"getUserByIdToMap\" resultType=\"map\">\n select * from t_user where id = #{id}\n <\/select>\n \n <!--Map<String, Object> getAllUserToMap();-->\n <select id=\"getAllUserToMap\" resultType=\"map\">\n select * from t_user\n <\/select><\/strong>\n\n<\/mapper><\/code><\/pre>\n\n\n\nmapper<\/p>\n\n\n\n
SelectMapper .java<\/strong><\/h3>\n\n\n\npackage top.qaqaq.mybatis.mapper;\n\nimport org.apache.ibatis.annotations.MapKey;\nimport org.apache.ibatis.annotations.Param;\nimport top.qaqaq.mybatis.pojo.User;\n\nimport java.util.List;\nimport java.util.Map;\n\npublic interface SelectMapper {\n\n \/**\n * \u6839\u636eid\u67e5\u8be2\u7528\u6237\u4fe1\u606f\n *\/\n List<User> getUserById(@Param(\"id\") Integer id);\n\n \/**\n * \u67e5\u8be2\u6240\u6709\u7684\u7528\u6237\u4fe1\u606f\n *\/\n List<User> getAllUser();\n\n \/**\n * \u67e5\u8be2\u7528\u6237\u4fe1\u606f\u7684\u603b\u8bb0\u5f55\u6570\n *\/\n Integer getCount();\n\n \/**\n * \u6839\u636eid\u67e5\u8be2\u7528\u6237\u4fe1\u606f\u4e3a\u4e00\u4e2amap\u96c6\u5408\n *\/\n Map<String, Object> getUserByIdToMap(@Param(\"id\") Integer id);\n\n \/**\n * \u67e5\u8be2\u6240\u6709\u7528\u6237\u4fe1\u606f\u4e3amap\u96c6\u5408\n *\/\n \/\/List<Map<String, Object>> getAllUserToMap();\n @MapKey(\"id\")\n Map<String, Object> getAllUserToMap();\n}\n<\/strong><\/code><\/pre>\n\n\n\npojo<\/p>\n\n\n\n
User .java<\/p>\n\n\n\n
package top.qaqaq.mybatis.pojo;\n\n\/**\n * @author RichieZhang\n * @create 2023-01-01 15:37\n *\/\npublic class User {\n\n private Integer id;\n private String username;\n private String password;\n private Integer age;\n private String sex;\n private String email;\n\n public User() {\n }\n\n public User(Integer id, String username, String password, Integer age, String sex, String email) {\n this.id = id;\n this.username = username;\n this.password = password;\n this.age = age;\n this.sex = sex;\n this.email = email;\n }\n\n public Integer getId() {\n return id;\n }\n\n public void setId(Integer id) {\n this.id = id;\n }\n\n public String getUsername() {\n return username;\n }\n\n public void setUsername(String username) {\n this.username = username;\n }\n\n public String getPassword() {\n return password;\n }\n\n public void setPassword(String password) {\n this.password = password;\n }\n\n public Integer getAge() {\n return age;\n }\n\n public void setAge(Integer age) {\n this.age = age;\n }\n\n public String getSex() {\n return sex;\n }\n\n public void setSex(String sex) {\n this.sex = sex;\n }\n\n public String getEmail() {\n return email;\n }\n\n public void setEmail(String email) {\n this.email = email;\n }\n\n @Override\n public String toString() {\n return \"User{\" +\n \"id=\" + id +\n \", username='\" + username + '\\'' +\n \", password='\" + password + '\\'' +\n \", age=\" + age +\n \", sex='\" + sex + '\\'' +\n \", email='\" + email + '\\'' +\n '}';\n }\n}\n<\/code><\/pre>\n\n\n\nutils<\/p>\n\n\n\n
SqlSessionUtils .java<\/p>\n\n\n\n
package top.qaqaq.mybatis.utils;\n\nimport org.apache.ibatis.io.Resources;\nimport org.apache.ibatis.session.SqlSession;\nimport org.apache.ibatis.session.SqlSessionFactory;\nimport org.apache.ibatis.session.SqlSessionFactoryBuilder;\n\nimport java.io.IOException;\nimport java.io.InputStream;\n\npublic class SqlSessionUtils {\n\n public static SqlSession getSqlSession() {\n SqlSession sqlSession = null;\n try {\n InputStream is = Resources.getResourceAsStream(\"mybatis-config.xml\");\n SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(is);\n sqlSession = sqlSessionFactory.openSession(true);\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n return sqlSession;\n }\n}\n<\/code><\/pre>\n\n\n\ntest<\/p>\n\n\n\n
SelectMapperTest .java<\/strong><\/h3>\n\n\n\npackage top.qaqaq.mybatis.test;\n\nimport org.apache.ibatis.session.SqlSession;\nimport org.junit.Test;\nimport top.qaqaq.mybatis.mapper.SelectMapper;\nimport top.qaqaq.mybatis.utils.SqlSessionUtils;\n\npublic class SelectMapperTest {\n\n \/**\n * MyBatis\u7684\u5404\u79cd\u67e5\u8be2\u529f\u80fd\uff1a\n * 1\u3001\u82e5\u67e5\u8be2\u51fa\u7684\u6570\u636e\u53ea\u6709\u4e00\u6761\n * a>\u53ef\u4ee5\u901a\u8fc7\u5b9e\u4f53\u7c7b\u5bf9\u8c61\u63a5\u6536\n * b>\u53ef\u4ee5\u901a\u8fc7list\u96c6\u5408\u63a5\u6536\n * c>\u53ef\u4ee5\u901a\u8fc7map\u96c6\u5408\u63a5\u6536\n * \u7ed3\u679c\uff1a{password=123456, sex=\u7537, id=5, age=23, email=12345@qq.com, username=\u5f20\u4e09}\n * 2\u3001\u82e5\u67e5\u8be2\u51fa\u7684\u6570\u636e\u6709\u591a\u6761\n * a>\u53ef\u4ee5\u901a\u8fc7\u5b9e\u4f53\u7c7b\u578b\u7684list\u96c6\u5408\u63a5\u6536\n * b>\u53ef\u4ee5\u901a\u8fc7map\u7c7b\u578b\u7684list\u96c6\u5408\u63a5\u6536\n * c>\u53ef\u4ee5\u5728mapper\u63a5\u53e3\u7684\u65b9\u6cd5\u4e0a\u6dfb\u52a0@MapKey\u6ce8\u89e3\uff0c\u6b64\u65f6\u5c31\u53ef\u4ee5\u5c06\u6bcf\u6761\u6570\u636e\u8f6c\u6362\u7684map\u96c6\u5408\u4f5c\u4e3a\u503c\uff0c\u4ee5\u67d0\u4e2a\u5b57\u6bb5\u7684\u503c\u4f5c\u4e3a\u952e\uff0c\u653e\u5728\u540c\u4e00\u4e2amap\u96c6\u5408\u4e2d\n * \u6ce8\u610f\uff1a\u4e00\u5b9a\u4e0d\u80fd\u901a\u8fc7\u5b9e\u4f53\u7c7b\u5bf9\u8c61\u63a5\u6536\uff0c\u6b64\u65f6\u4f1a\u629b\u5f02\u5e38TooManyResultsException\n *\n * MyBatis\u4e2d\u8bbe\u7f6e\u4e86\u9ed8\u8ba4\u7684\u7c7b\u578b\u522b\u540d\n * java.lang.Integer-->int,integer\n * int-->_int,_integer\n * Map-->map\n * String-->string\n *\/\n\n @Test\n public void testGetAllUserToMap() {\n SqlSession sqlSession = SqlSessionUtils.getSqlSession();\n SelectMapper mapper = sqlSession.getMapper(SelectMapper.class);\n System.out.println(mapper.getAllUserToMap());\n }\n\n @Test\n public void testGetUserByIdToMap() {\n SqlSession sqlSession = SqlSessionUtils.getSqlSession();\n SelectMapper mapper = sqlSession.getMapper(SelectMapper.class);\n System.out.println(mapper.getUserByIdToMap(5));\n }\n\n @Test\n public void testGetCount() {\n SqlSession sqlSession = SqlSessionUtils.getSqlSession();\n SelectMapper mapper = sqlSession.getMapper(SelectMapper.class);\n System.out.println(mapper.getCount());\n }\n\n @Test\n public void testGetAllUser() {\n SqlSession sqlSession = SqlSessionUtils.getSqlSession();\n SelectMapper mapper = sqlSession.getMapper(SelectMapper.class);\n System.out.println(mapper.getAllUser());\n }\n\n @Test\n public void testGetUserById() {\n SqlSession sqlSession = SqlSessionUtils.getSqlSession();\n SelectMapper mapper = sqlSession.getMapper(SelectMapper.class);\n System.out.println(mapper.getUserById(5));\n }\n}\n<\/strong><\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"pom.xml resources mybatis-config.xml jdbc.properties lo […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[108],"tags":[111],"class_list":["post-3101","post","type-post","status-publish","format-standard","hentry","category-mybatis-code","tag-mybatis"],"_links":{"self":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/3101"}],"collection":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3101"}],"version-history":[{"count":3,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/3101\/revisions"}],"predecessor-version":[{"id":3121,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/3101\/revisions\/3121"}],"wp:attachment":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3101"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3101"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3101"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}