{"id":52930,"date":"2025-08-11T21:39:12","date_gmt":"2025-08-11T13:39:12","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/52930.html"},"modified":"2025-08-11T21:39:12","modified_gmt":"2025-08-11T13:39:12","slug":"mybatis%e7%9b%b8%e5%85%b3%e7%9f%a5%e8%af%86%e7%82%b9%e6%80%bb%e7%bb%93","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/52930.html","title":{"rendered":"MyBatis\u76f8\u5173\u77e5\u8bc6\u70b9\u603b\u7ed3"},"content":{"rendered":"

\u4e00\u3001\u4ec0\u4e48\u662fMybatis<\/h2>\n

MyBatis \u662f\u4e00\u6b3e\u4f18\u79c0\u7684\u6301\u4e45\u5c42\u6846\u67b6，\u5b83\u652f\u6301\u81ea\u5b9a\u4e49 SQL\u3001\u5b58\u50a8\u8fc7\u7a0b\u4ee5\u53ca\u9ad8\u7ea7\u6620\u5c04\u3002MyBatis \u514d\u9664\u4e86\u51e0\u4e4e\u6240\u6709\u7684 JDBC \u4ee3\u7801\u4ee5\u53ca\u8bbe\u7f6e\u53c2\u6570\u548c\u83b7\u53d6\u7ed3\u679c\u96c6\u7684\u5de5\u4f5c\u3002Mybatis\u662f\u4e00\u4e2a\u534a<\/span>ORM<\/span>（\u5bf9\u8c61\u5173\u7cfb\u6620\u5c04）\u6846\u67b6，\u5b83\u5185\u90e8\u5c01\u88c5\u4e86<\/span>JDBC<\/span>，\u52a0\u8f7d\u9a71\u52a8\u3001\u521b\u5efa\u8fde\u63a5\u3001\u521b\u5efa statement\u7b49\u7e41\u6742\u7684\u8fc7\u7a0b，\u5f00\u53d1\u8005\u5f00\u53d1\u65f6\u53ea\u9700\u8981\u5173\u6ce8\u5982\u4f55\u7f16\u5199<\/span>SQL<\/span>\u8bed\u53e5，\u53ef\u4ee5\u4e25\u683c\u63a7\u5236<\/span>sql<\/span>\u6267\u884c\u6027\u80fd，\u7075\u6d3b\u5ea6\u9ad8\u3002 <\/span><\/p>\n

\u4f5c\u4e3a\u4e00\u4e2a\u534a<\/span>ORM<\/span>\u6846\u67b6，<\/span>MyBatis <\/span>\u53ef\u4ee5\u4f7f\u7528<\/span> XML <\/span>\u6216\u6ce8\u89e3\u6765\u914d\u7f6e\u548c\u6620\u5c04\u539f\u751f\u4fe1\u606f，\u5c06<\/span> POJO<\/span>\u6620\u5c04\u6210\u6570<\/span>\u636e\u5e93\u4e2d\u7684\u8bb0\u5f55，\u907f\u514d\u4e86\u51e0\u4e4e\u6240\u6709\u7684<\/span> JDBC <\/span>\u4ee3\u7801\u548c\u624b\u52a8\u8bbe\u7f6e\u53c2\u6570\u4ee5\u53ca\u83b7\u53d6\u7ed3\u679c\u96c6\u3002 <\/span><\/p>\n

\u901a\u8fc7<\/span>xml <\/span>\u6587\u4ef6\u6216\u6ce8\u89e3\u7684\u65b9\u5f0f\u5c06\u8981\u6267\u884c\u7684\u5404\u79cd<\/span> statement <\/span>\u914d\u7f6e\u8d77\u6765，\u5e76\u901a\u8fc7<\/span>java<\/span>\u5bf9\u8c61\u548c<\/span> statement<\/span>\u4e2d <\/span><\/p>\n

sql<\/span>\u7684\u52a8\u6001\u53c2\u6570\u8fdb\u884c\u6620\u5c04\u751f\u6210\u6700\u7ec8\u6267\u884c\u7684<\/span>sql<\/span>\u8bed\u53e5，\u6700\u540e\u7531<\/span>mybatis<\/span>\u6846\u67b6\u6267\u884c<\/span>sql<\/span>\u5e76\u5c06\u7ed3\u679c\u6620\u5c04\u4e3a<\/span>java <\/span><\/p>\n

\u5bf9\u8c61\u5e76\u8fd4\u56de\u3002（\u4ece\u6267\u884c<\/span>sql<\/span>\u5230\u8fd4\u56de<\/span>result<\/span>\u7684\u8fc7\u7a0b）\u3002 <\/span><\/p>\n

\u7531\u4e8e<\/span>MyBatis<\/span>\u4e13\u6ce8\u4e8e<\/span>SQL<\/span>\u672c\u8eab，\u7075\u6d3b\u5ea6\u9ad8，\u6240\u4ee5\u6bd4\u8f83\u9002\u5408\u5bf9\u6027\u80fd\u7684\u8981\u6c42\u5f88\u9ad8，\u6216\u8005\u9700\u6c42\u53d8\u5316\u8f83\u591a\u7684 <\/span><\/p>\n

\u9879\u76ee，\u5982\u4e92\u8054\u7f51\u9879\u76ee\u3002 <\/span><\/p>\n

1.1\u4ec0\u4e48\u662fORM<\/span><\/h3>\n

ORM(Object-relational mapping)<\/span>，\u5373<\/span>\u5bf9\u8c61\u5173\u7cfb\u6620\u5c04<\/span>，<\/span>\u662f\u4e00\u79cd\u4e3a\u4e86\u89e3\u51b3\u9762\u5411\u5bf9\u8c61\u4e0e\u5173\u7cfb\u6570\u636e\u5e93\u5b58 <\/span><\/p>\n

\u5728\u7684\u4e92\u4e0d\u5339\u914d\u7684\u73b0\u8c61\u7684\u6280\u672f\u3002<\/span>\u7b80\u5355\u7684\u8bf4，<\/span>ORM<\/span>\u662f\u901a\u8fc7\u4f7f\u7528\u63cf\u8ff0\u5bf9\u8c61\u548c\u6570\u636e\u5e93\u4e4b\u95f4\u6620\u5c04\u7684\u5143\u6570\u636e， <\/span><\/p>\n

\u5c06\u7a0b\u5e8f\u4e2d\u7684\u5bf9\u8c61\u81ea\u52a8\u6301\u4e45\u5316\u5230\u5173\u7cfb\u6570\u636e\u5e93\u4e2d\u3002<\/span><\/p>\n

1\u3001O->R add\/insert\/save<\/p>\n

studentDao.insert(student)<\/p>\n

\u628a\u4e00\u4e2ajava\u5bf9\u8c61\u4fdd\u5b58\u5230\u6570\u636e\u5e93\u4e2d\u7684\u4e00\u884c\u8bb0\u5f55<\/p>\n

2\u3001R->O selectById\/findById\/listById<\/p>\n

Student student = sudentDao.findById(id)<\/p>\n

\u628a\u6570\u636e\u5e93\u91cc\u9762\u7684\u4e00\u884c\u8bb0\u5f55\u5c01\u88c5\u6210\u4e00\u4e2ajava\u5bf9\u8c61<\/p>\n

\"\"<\/p>\n

1.2\u00a0Mybaits<\/span>\u7684\u4f18\u7f3a\u70b9 <\/span><\/h3>\n

\u4f18\u70b9 <\/span><\/p>\n

\u57fa\u4e8e<\/span>SQL<\/span>\u8bed\u53e5\u7f16\u7a0b，\u76f8\u5f53\u7075\u6d3b，\u4e0d\u4f1a\u5bf9\u5e94\u7528\u7a0b\u5e8f\u6216\u8005\u6570\u636e\u5e93\u7684\u73b0\u6709\u8bbe\u8ba1\u9020\u6210\u4efb\u4f55\u5f71\u54cd，<\/span>SQL<\/span>\u5199\u5728 <\/span><\/p>\n

XML<\/span>\u91cc，\u89e3\u9664<\/span>sql<\/span>\u4e0e\u7a0b\u5e8f\u4ee3\u7801\u7684\u8026\u5408，\u4fbf\u4e8e\u7edf\u4e00\u7ba1\u7406<\/span>；\u63d0\u4f9b<\/span>XML<\/span>\u6807\u7b7e，\u652f\u6301\u7f16\u5199\u52a8\u6001<\/span>SQL<\/span>\u8bed\u53e5，\u5e76 <\/span><\/p>\n

\u53ef\u91cd\u7528\u3002 <\/span><\/p>\n

\u4e0e<\/span>JDBC<\/span>\u76f8\u6bd4，\u51cf\u5c11\u4e86<\/span>50%<\/span>\u4ee5\u4e0a\u7684\u4ee3\u7801\u91cf，\u6d88\u9664\u4e86<\/span>JDBC<\/span>\u5927\u91cf\u5197\u4f59\u7684\u4ee3\u7801，\u4e0d\u9700\u8981\u624b\u52a8\u5f00\u5173\u8fde\u63a5； <\/span><\/p>\n

\u5f88\u597d\u7684\u4e0e\u5404\u79cd\u6570\u636e\u5e93\u517c\u5bb9（\u56e0\u4e3a<\/span>MyBatis<\/span>\u4f7f\u7528<\/span>JDBC<\/span>\u6765\u8fde\u63a5\u6570\u636e\u5e93，\u6240\u4ee5\u53ea\u8981<\/span>JDBC<\/span>\u652f\u6301\u7684\u6570\u636e\u5e93 <\/span><\/p>\n

MyBatis<\/span>\u90fd\u652f\u6301）\u3002 <\/span><\/p>\n

\u80fd\u591f\u4e0e<\/span>Spring<\/span>\u5f88\u597d\u7684\u96c6\u6210； \u63d0\u4f9b\u6620\u5c04\u6807\u7b7e，\u652f\u6301\u5bf9\u8c61\u4e0e\u6570\u636e\u5e93\u7684<\/span>ORM<\/span>\u5b57\u6bb5\u5173\u7cfb\u6620\u5c04； <\/span><\/p>\n

\u63d0\u4f9b\u5bf9\u8c61\u5173\u7cfb\u6620\u5c04\u6807\u7b7e，\u652f\u6301\u5bf9\u8c61\u5173\u7cfb\u7ec4\u4ef6\u7ef4\u62a4\u3002 <\/span><\/p>\n

\u7f3a\u70b9 <\/span><\/p>\n

SQL<\/span>\u8bed\u53e5\u7684\u7f16\u5199\u5de5\u4f5c\u91cf\u8f83\u5927，\u5c24\u5176\u5f53\u5b57\u6bb5\u591a\u3001\u5173\u8054\u8868\u591a\u65f6，\u5bf9\u5f00\u53d1\u4eba\u5458\u7f16\u5199<\/span>SQL<\/span>\u8bed\u53e5\u7684\u529f\u5e95\u6709\u4e00\u5b9a <\/span><\/p>\n

\u8981\u6c42\u3002 <\/span><\/p>\n

SQL<\/span>\u8bed\u53e5\u4f9d\u8d56\u4e8e\u6570\u636e\u5e93，\u5bfc\u81f4\u6570\u636e\u5e93\u79fb\u690d\u6027\u5dee，\u4e0d\u80fd\u968f\u610f\u66f4\u6362\u6570\u636e\u5e93\u3002<\/span><\/p>\n

\u4e8c\u3001Mybatis\u58f0\u660e\u63a5\u53e3<\/h2>\n

MyBatis \u901a\u8fc7\u63a5\u53e3\u4e0e SQL \u8bed\u53e5\u8fdb\u884c\u6620\u5c04，\u65e0\u9700\u5b9e\u73b0\u7c7b\u5373\u53ef\u76f4\u63a5\u8c03\u7528\u3002\u63a5\u53e3\u901a\u5e38\u4e0e Mapper \u7ed1\u5b9a，\u5b9a\u4e49\u6570\u636e\u64cd\u4f5c\u65b9\u6cd5\u3002<\/p>\n

2.1CourseMapper\u63a5\u53e3<\/h3>\n

@Mapper \/\/ \u6807\u8bc6\u8be5\u63a5\u53e3\u4e3aMyBatis\u6620\u5c04\u5668，MyBatis\u4f1a\u52a8\u6001\u751f\u6210\u5176\u5b9e\u73b0\u7c7b
\npublic interface CourseMapper {
\n \/\/ \u6839\u636e\u8bfe\u7a0bID\u67e5\u8be2\u8bfe\u7a0b\u4fe1\u606f
\n Course getByID(@Param("id") Integer id); <\/p>\n

\/\/ \u6839\u636e\u6761\u4ef6\u52a8\u6001\u67e5\u8be2\u8bfe\u7a0b\u5217\u8868
\n List<Course> list(@Param("course") Course course); <\/p>\n

\/\/ \u65b0\u589e\u8bfe\u7a0b\u4fe1\u606f
\n int add(@Param("course") Course course); <\/p>\n

\/\/ \u4fee\u6539\u8bfe\u7a0b\u4fe1\u606f
\n int edit(@Param("course") Course course); <\/p>\n

\/\/ \u5220\u9664\u8bfe\u7a0b\u4fe1\u606f
\n int delete(@Param("course") Course course);
\n} <\/p>\n

2.2TeacherMapper \u63a5\u53e3<\/h3>\n

@Mapper \/\/ MyBatis\u6620\u5c04\u5668\u63a5\u53e3
\npublic interface TeacherMapper {
\n \/\/ \u65b0\u589e\u5355\u4e2a\u6559\u5e08\u4fe1\u606f
\n int add(@Param("teacher") Teacher teacher); <\/p>\n

\/\/ \u6279\u91cf\u65b0\u589e\u6559\u5e08\u4fe1\u606f
\n int addTeachers(@Param("teachers") List<Teacher> teachers); <\/p>\n

\/\/ \u6839\u636eID\u5220\u9664\u6559\u5e08\u4fe1\u606f
\n int delete(@Param("id") Integer id); <\/p>\n

\/\/ \u4fee\u6539\u6559\u5e08\u4fe1\u606f
\n int edit(@Param("teacher") Teacher teacher); <\/p>\n

\/\/ \u67e5\u8be2\u6240\u6709\u6559\u5e08\u5217\u8868
\n List<Teacher> list(); <\/p>\n

\/\/ \u6839\u636eID\u67e5\u8be2\u6559\u5e08\u4fe1\u606f
\n Teacher getByID(@Param("id") Integer id); <\/p>\n

\/\/ \u52a8\u6001\u6761\u4ef6\u67e5\u8be2\u6559\u5e08\u5217\u8868
\n List<Teacher> listSearch(@Param("teacher") Teacher teacher);
\n} <\/p>\n

\u4e09\u3001\u7ed1\u5b9asql\u65b9\u5f0f<\/h2>\n

\u4ee5\u53ca\u4e24\u79cd\u65b9\u5f0f\u7684\u589e\u5220\u6539\u67e5<\/h2>\n

3.1. \u6ce8\u89e3\u65b9\u5f0f\u5b9e\u73b0<\/h3>\n

\u76f4\u63a5\u5728\u63a5\u53e3\u65b9\u6cd5\u4e0a\u4f7f\u7528\u6ce8\u89e3\u7f16\u5199 SQL(StudentMapper)：<\/p>\n

@Repository \/\/ \u6807\u8bc6\u4e3aSpring\u6570\u636e\u8bbf\u95ee\u5c42\u7ec4\u4ef6
\n@Mapper \/\/ MyBatis\u6620\u5c04\u5668\u63a5\u53e3
\npublic interface StudentMapper {
\n \/\/ \u6839\u636e\u5b66\u751fID\u67e5\u8be2\u5b66\u751f\u4fe1\u606f（\u4f7f\u7528\u6ce8\u89e3SQL）
\n @Select("SELECT * FROM student WHERE student_id = #{stuid}")
\n Student getStudentByid(@Param("stuid") Integer id); <\/p>\n

\/\/ \u65b0\u589e\u5b66\u751f\u4fe1\u606f（\u4f7f\u7528\u6ce8\u89e3SQL）
\n @Insert("INSERT INTO student(student_name, birthday, gender, age) " +
\n "VALUES (#{student.student_name}, #{student.birthday}, #{student.gender}, #{student.age})")
\n int addStudent(@Param("student") Student student); <\/p>\n

\/\/ \u6839\u636e\u5b66\u751fID\u5220\u9664\u5b66\u751f\u4fe1\u606f（\u4f7f\u7528\u6ce8\u89e3SQL）
\n @Delete("DELETE FROM student WHERE student_id = #{stuid}")
\n int deleteStudent(@Param("stuid") Integer id); <\/p>\n

\/\/ \u4fee\u6539\u5b66\u751f\u4fe1\u606f（\u4f7f\u7528\u6ce8\u89e3SQL）
\n @Update("UPDATE student SET student_name = #{student.student_name}, " +
\n "gender = #{student.gender}, age = #{student.age} WHERE student_id = #{student.student_id}")
\n int editStudent(@Param("student") Student student); <\/p>\n

\/\/ \u52a8\u6001\u6761\u4ef6\u67e5\u8be2\u5b66\u751f\u5217\u8868（XML\u914d\u7f6eSQL）
\n List<Student> list1(@Param("student") Student student);
\n} <\/p>\n

3.2\u00a0XML \u6587\u4ef6\u65b9\u5f0f\u5b9e\u73b0<\/h3>\n

\u521b\u5efa\u5bf9\u5e94\u7684 Mapper XML \u6587\u4ef6（teacherMapper.xml）：<\/p>\n

<?xml version="1.0" encoding="UTF-8"?>
\n<!DOCTYPE mapper PUBLIC "-\/\/mybatis.org\/\/DTD Mapper 3.0\/\/EN"
\n"http:\/\/mybatis.org\/dtd\/mybatis-3-mapper.dtd">
\n<!– \u547d\u540d\u7a7a\u95f4\u9700\u4e0e\u63a5\u53e3\u5168\u8def\u5f84\u4e00\u81f4 –>
\n<mapper namespace="com.example.mapper.UserMapper"><\/p>\n

<!– \u67e5\u8be2 –>
\n <select id="getUserById" parameterType="java.lang.Integer" resultMap="BaseResultMap">
\n SELECT id, name, age, email FROM user WHERE id = #{id}
\n <\/select><\/p>\n

<!– \u65b0\u589e –>
\n <insert id="insertUser" parameterType="com.example.entity.User"
\n useGeneratedKeys="true" keyProperty="id">
\n INSERT INTO user(name, age, email) VALUES(#{name}, #{age}, #{email})
\n <\/insert>
\n useGeneratedKeys="true"：\u544a\u8bc9 MyBatis，\u5f53\u524d\u63d2\u5165\u64cd\u4f5c\u7684\u4e3b\u952e\u662f\u7531\u6570\u636e\u5e93\u81ea\u52a8\u751f\u6210\u7684
\n keyProperty="id"：\u6307\u5b9a\u5c06\u6570\u636e\u5e93\u751f\u6210\u7684\u4e3b\u952e\u503c，\u8d4b\u503c\u7ed9\u4f20\u5165\u53c2\u6570\u5bf9\u8c61\u7684id\u5c5e\u6027\u3002<\/p>\n

<!– \u66f4\u65b0 –>
\n <update id="updateUser" parameterType="com.example.entity.User">
\n UPDATE user SET name = #{name}, age = #{age}, email = #{email} WHERE id = #{id}
\n <\/update><\/p>\n

<!– \u5220\u9664 –>
\n <delete id="deleteUser" parameterType="java.lang.Integer">
\n DELETE FROM user WHERE id = #{id}
\n <\/delete>
\n<\/mapper><\/p>\n

\u56db\u3001\u52a8\u6001sql\u8bed\u53e5\u7684\u6807\u7b7e<\/h2>\n

\u52a8\u6001 SQL \u7528\u4e8e\u6839\u636e\u6761\u4ef6\u52a8\u6001\u751f\u6210 SQL \u7247\u6bb5，\u5e38\u7528\u6807\u7b7e：<\/span><\/span><\/p>\n

\n

\u52a8\u6001 SQL \u662f MyBatis \u63d0\u4f9b\u7684\u4e00\u79cd\u5f3a\u5927\u529f\u80fd，\u5141\u8bb8\u6839\u636e\u8fd0\u884c\u65f6\u6761\u4ef6\u52a8\u6001\u751f\u6210 SQL \u8bed\u53e5\u7247\u6bb5\u3002\u4ee5\u4e0b\u662f\u5e38\u7528\u6807\u7b7e\u7684\u8be6\u7ec6\u8bf4\u660e\u548c\u4f7f\u7528\u793a\u4f8b：<\/p>\n

<if> \u6807\u7b7e<\/h5>\n

\u7528\u4e8e\u6761\u4ef6\u5224\u65ad，\u6839\u636e\u6761\u4ef6\u52a8\u6001\u5305\u542b SQL \u7247\u6bb5\u3002\u793a\u4f8b：<\/p>\n

<select id="findUsers" resultType="User">
\n SELECT * FROM users
\n WHERE 1=1
\n <if test="name != null">
\n AND name = #{name}
\n <\/if>
\n <if test="age != null">
\n AND age = #{age}
\n <\/if>
\n<\/select><\/p>\n

<where> \u6807\u7b7e<\/h5>\n

\u81ea\u52a8\u5904\u7406 WHERE \u5b50\u53e5\u4e2d\u7684 AND\/OR \u5173\u952e\u5b57，\u907f\u514d\u8bed\u6cd5\u9519\u8bef\u3002\u793a\u4f8b：<\/p>\n

<select id="findUsers" resultType="User">
\n SELECT * FROM users
\n <where>
\n <if test="name != null">
\n AND name = #{name}
\n <\/if>
\n <if test="age != null">
\n AND age = #{age}
\n <\/if>
\n <\/where>
\n<\/select><\/p>\n

<set> \u6807\u7b7e<\/h5>\n

\u7528\u4e8e UPDATE \u8bed\u53e5，\u81ea\u52a8\u5904\u7406 SET \u5b50\u53e5\u4e2d\u7684\u9017\u53f7\u5206\u9694\u3002\u793a\u4f8b：<\/p>\n

<update id="updateUser">
\n UPDATE users
\n <set>
\n <if test="name != null">
\n name = #{name},
\n <\/if>
\n <if test="age != null">
\n age = #{age},
\n <\/if>
\n <\/set>
\n WHERE id = #{id}
\n<\/update><\/p>\n

<foreach> \u6807\u7b7e<\/h5>\n

\u904d\u5386\u96c6\u5408，\u5e38\u7528\u4e8e IN \u6761\u4ef6\u6216\u6279\u91cf\u63d2\u5165\u3002\u793a\u4f8b：<\/p>\n

<select id="findUsersByIds" resultType="User">
\n SELECT * FROM users
\n WHERE id IN
\n <foreach item="id" collection="ids" open="(" separator="," close=")">
\n #{id}
\n <\/foreach>
\n<\/select><\/p>\n

<choose> <when> <otherwise> \u6807\u7b7e<\/h5>\n

\u5b9e\u73b0\u591a\u6761\u4ef6\u5206\u652f\u9009\u62e9，\u7c7b\u4f3c Java \u7684 switch-case \u7ed3\u6784\u3002\u793a\u4f8b:<\/p>\n

<select id="findUsers" resultType="User">
\n SELECT * FROM users
\n <where>
\n <choose>
\n <when test="name != null">
\n AND name = #{name}
\n <\/when>
\n <when test="email != null">
\n AND email = #{email}
\n <\/when>
\n <otherwise>
\n AND status = 'ACTIVE'
\n <\/otherwise>
\n <\/choose>
\n <\/where>
\n<\/select><\/p>\n

<trim> \u6807\u7b7e<\/h5>\n

\u63d0\u4f9b\u66f4\u7075\u6d3b\u7684 SQL \u7247\u6bb5\u62fc\u63a5\u63a7\u5236，\u53ef\u81ea\u5b9a\u4e49\u524d\u7f00\u3001\u540e\u7f00\u548c\u5206\u9694\u7b26\u5904\u7406\u3002\u793a\u4f8b：<\/p>\n

<select id="findUsers" resultType="User">
\n SELECT * FROM users
\n <trim prefix="WHERE" prefixOverrides="AND |OR ">
\n <if test="name != null">
\n AND name = #{name}
\n <\/if>
\n <if test="age != null">
\n OR age = #{age}
\n <\/if>
\n <\/trim>
\n<\/select><\/p>\n

<bind> \u6807\u7b7e<\/h5>\n

\u5b9a\u4e49\u53d8\u91cf\u5e76\u8d4b\u503c，\u901a\u5e38\u7528\u4e8e\u7b80\u5316\u590d\u6742\u8868\u8fbe\u5f0f\u6216\u517c\u5bb9\u4e0d\u540c\u6570\u636e\u5e93\u8bed\u6cd5\u3002\u793a\u4f8b：<\/p>\n

<select id="findUsers" resultType="User">
\n <bind name="pattern" value="'%' + name + '%'" \/>
\n SELECT * FROM users
\n WHERE name LIKE #{pattern}
\n<\/select><\/p>\n

\u56db\u3001# $\u7684\u53d6\u503c\u548c\u53d6\u53c2\u6570\u7684\u533a\u522b,\u5206\u522b\u7528\u5728\u4ec0\u4e48\u5730\u65b9?<\/h2>\n

4.1#{}<\/span><\/h3>\n
    \n
  • \u539f\u7406<\/span>：\u9884\u7f16\u8bd1\u5904\u7406，\u5c06\u53c2\u6570\u66ff\u6362\u4e3a\u00a0?<\/span>，\u901a\u8fc7 PreparedStatement \u6267\u884c，\u9632\u6b62 SQL \u6ce8\u5165\u3002<\/li>\n
  • \u53d6\u503c\u65b9\u5f0f<\/span>：\u4f1a\u81ea\u52a8\u6839\u636e\u53c2\u6570\u7c7b\u578b\u6dfb\u52a0\u5f15\u53f7（\u5982\u5b57\u7b26\u4e32\u52a0\u5355\u5f15\u53f7）\u3002<\/li>\n
  • \u9002\u7528\u573a\u666f<\/span>：\u5927\u591a\u6570\u53c2\u6570\u4f20\u9012，\u5982\u67e5\u8be2\u6761\u4ef6\u3001\u65b0\u589e \/ \u4fee\u6539\u7684\u5b57\u6bb5\u503c\u7b49\u3002<\/li>\n<\/ul>\n

    <!– #{}\u793a\u4f8b – \u5b89\u5168\u7684\u53c2\u6570\u4f20\u9012 –>
    \n<select id="getUserByName" parameterType="java.lang.String" resultMap="BaseResultMap">
    \n SELECT id, name, age, email FROM user WHERE name = #{name}
    \n <!– \u4f1a\u88ab\u9884\u7f16\u8bd1\u4e3a: SELECT * FROM user WHERE name = ? –>
    \n<\/select><\/p>\n

    4.2${}<\/h3>\n
      \n
    • \u539f\u7406<\/span>：\u5b57\u7b26\u4e32\u62fc\u63a5，\u76f4\u63a5\u5c06\u53c2\u6570\u5d4c\u5165 SQL \u8bed\u53e5，\u4e0d\u505a\u9884\u7f16\u8bd1，\u6709 SQL \u6ce8\u5165\u98ce\u9669\u3002<\/li>\n
    • \u53d6\u503c\u65b9\u5f0f<\/span>：\u4e0d\u4f1a\u6dfb\u52a0\u5f15\u53f7，\u9002\u7528\u4e8e\u52a8\u6001\u62fc\u63a5\u8868\u540d\u3001\u5217\u540d\u7b49\u3002<\/li>\n
    • \u9002\u7528\u573a\u666f<\/span>：\u52a8\u6001 SQL \u7247\u6bb5（\u5982\u8868\u540d\u3001\u6392\u5e8f\u5b57\u6bb5），\u9700\u786e\u4fdd\u53c2\u6570\u5b89\u5168（\u907f\u514d\u7528\u6237\u8f93\u5165）\u3002<\/li>\n
    • \u793a\u4f8b<\/span>：<\/li>\n<\/ul>\n

      <!– ${}\u793a\u4f8b – \u52a8\u6001\u8868\u540d –>
      \n<select id="findUsersByTableName" parameterType="java.lang.String" resultMap="BaseResultMap">
      \n SELECT id, name, age, email FROM ${tableName}
      \n <!– \u4f1a\u76f4\u63a5\u62fc\u63a5\u5b57\u7b26\u4e32，\u5982\u53c2\u6570\u4e3a"user_2025"，\u5219SQL\u4e3a: SELECT * FROM user_2025 –>
      \n<\/select><\/p>\n

      <!– \u52a8\u6001\u6392\u5e8f\u5b57\u6bb5 –>
      \n<select id="findUsersWithOrder" parameterType="java.util.Map" resultMap="BaseResultMap">
      \n SELECT id, name, age, email FROM user
      \n ORDER BY ${orderByColumn} ${orderType}
      \n<\/select><\/p>\n","protected":false},"excerpt":{"rendered":"

      \u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb115\u6b21\u3002MyBatis \u662f\u4e00\u6b3e\u4f18\u79c0\u7684\u6301\u4e45\u5c42\u6846\u67b6\uff0c\u5b83\u652f\u6301\u81ea\u5b9a\u4e49 SQL\u3001\u5b58\u50a8\u8fc7\u7a0b\u4ee5\u53ca\u9ad8\u7ea7\u6620\u5c04\u3002MyBatis \u514d\u9664\u4e86\u51e0\u4e4e\u6240\u6709\u7684 JDBC \u4ee3\u7801\u4ee5\u53ca\u8bbe\u7f6e\u53c2\u6570\u548c\u83b7\u53d6\u7ed3\u679c\u96c6\u7684\u5de5\u4f5c\u3002Mybatis\u662f\u4e00\u4e2a\u534aORM\uff08\u5bf9\u8c61\u5173\u7cfb\u6620\u5c04\uff09\u6846\u67b6\uff0c\u5b83JDBC\uff0c\u5f00\u53d1\u8005\u5f00\u53d1\u65f6\u53ea\u9700\u8981\u5173\u6ce8\u5982\u4f55\u7f16\u5199SQL\u8bed\u53e5\uff0c\u53ef\u4ee5\u4e25\u683c\u63a7\u5236sql\u6267\u884c\u6027\u80fd\uff0c\u7075\u6d3b\u5ea6\u9ad8\u3002\u901a\u8fc7xml\u6587\u4ef6\u6216\u6ce8\u89e3\u7684\u65b9\u5f0f\u5c06\u8981\u6267\u884c\u7684\u5404\u79cdstatement\u914d\u7f6e\u8d77\u6765\uff0c\u5e76\u901a\u8fc7java\u5bf9\u8c61\u548cstatement\u4e2dsql\u7684\u52a8\u6001\u53c2\u6570\u8fdb\u884c\u6620\u5c04\u751f\u6210\u6700\u7ec8\u6267\u884c\u7684sql\u8bed\u53e5\uff0c\u6700\u540e\u7531\u3002<\/p>\n","protected":false},"author":2,"featured_media":52929,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[99,1769,100,305],"topic":[],"class_list":["post-52930","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-java","tag-mybatis","tag-100","tag-305"],"yoast_head":"\nMyBatis\u76f8\u5173\u77e5\u8bc6\u70b9\u603b\u7ed3 - 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