1\u3001\u5e94\u5bf9\u591a\u4e2a\u6761\u4ef6\u67e5\u8be2\u3002<\/p>\n
2\u3001\u6709\u5f88\u591a\u6761\u4ef6\u4e0d\u6ee1\u8db3\u7684\u3002<\/p>\n
1\u3001\u52a8\u6001 SQL \u662f MyBatis \u7684\u5f3a\u5927\u7279\u6027\u4e4b\u4e00\u3002\u5982\u679c\u4f60\u4f7f\u7528\u8fc7 JDBC \u6216\u5176\u5b83\u7c7b\u4f3c\u7684\u6846\u67b6\uff0c\u4f60\u5e94\u8be5\u80fd\u7406\u89e3\u6839\u636e\u4e0d\u540c\u6761\u4ef6\u62fc\u63a5 SQL \u8bed\u53e5\u6709\u591a\u75db\u82e6\uff0c\u4f8b\u5982\u62fc\u63a5\u65f6\u8981\u786e\u4fdd\u4e0d\u80fd\u5fd8\u8bb0\u6dfb\u52a0\u5fc5\u8981\u7684\u7a7a\u683c\uff0c\u8fd8\u8981\u6ce8\u610f\u53bb\u6389\u5217\u8868\u6700\u540e\u4e00\u4e2a\u5217\u540d\u7684\u9017\u53f7\u3002\u5229\u7528\u52a8\u6001 SQL\uff0c\u53ef\u4ee5\u5f7b\u5e95\u6446\u8131\u8fd9\u79cd\u75db\u82e6\u3002<\/p>\n
2\u3001\u4f7f\u7528\u52a8\u6001 SQL \u5e76\u975e\u4e00\u4ef6\u6613\u4e8b\uff0c\u4f46\u501f\u52a9\u53ef\u7528\u4e8e\u4efb\u4f55 SQL \u6620\u5c04\u8bed\u53e5\u4e2d\u7684\u5f3a\u5927\u7684\u52a8\u6001 SQL \u8bed\u8a00\uff0cMyBatis \u663e\u8457\u5730\u63d0\u5347\u4e86\u8fd9\u4e00\u7279\u6027\u7684\u6613\u7528\u6027\u3002<\/p>\n
3\u3001\u5982\u679c\u4f60\u4e4b\u524d\u7528\u8fc7 JSTL \u6216\u4efb\u4f55\u57fa\u4e8e\u7c7b XML \u8bed\u8a00\u7684\u6587\u672c\u5904\u7406\u5668\uff0c\u4f60\u5bf9\u52a8\u6001 SQL \u5143\u7d20\u53ef\u80fd\u4f1a\u611f\u89c9\u4f3c\u66fe\u76f8\u8bc6\u3002\u5728 MyBatis \u4e4b\u524d\u7684\u7248\u672c\u4e2d\uff0c\u9700\u8981\u82b1\u65f6\u95f4\u4e86\u89e3\u5927\u91cf\u7684\u5143\u7d20\u3002\u501f\u52a9\u529f\u80fd\u5f3a\u5927\u7684\u57fa\u4e8e OGNL \u7684\u8868\u8fbe\u5f0f\uff0cMyBatis 3 \u66ff\u6362\u4e86\u4e4b\u524d\u7684\u5927\u90e8\u5206\u5143\u7d20\uff0c\u5927\u5927\u7cbe\u7b80\u4e86\u5143\u7d20\u79cd\u7c7b\uff0c\u73b0\u5728\u8981\u5b66\u4e60\u7684\u5143\u7d20\u79cd\u7c7b\u6bd4\u539f\u6765\u7684\u4e00\u534a\u8fd8\u8981\u5c11\u3002<\/p>\n
1\u3001\u5c31\u662f\u7528\u6765\u8fdb\u884c\u5224\u65ad\uff0c\u54ea\u4e9b\u6761\u4ef6\u9700\u8981\u52a0<\/p>\n
2\u3001\u5185\u5bb9<\/p>\n
1\u3001\u5c31\u662f\u7528\u6765\u89e3\u51b3\uff0cif\u5224\u65ad\u4e2d\u53ef\u80fd\u51fa\u73b0\u7684\u95ee\u9898<\/p>\n
2\u3001\u95ee\u9898<\/p>\n
3\u3001where\u7684\u4f5c\u7528<\/p>\n
1\u3001\u51c6\u5907\u5b9e\u4f53\u7c7b<\/p>\n
package com.atgui.pojo;\n\npublic class Employee {\n private int empId;\n private String empName;\n private String empSalary;\n\n public int getEmpId() {\n return empId;\n }\n\n public void setEmpId(int empId) {\n this.empId = empId;\n }\n\n public String getEmpName() {\n return empName;\n }\n\n public void setEmpName(String empName) {\n this.empName = empName;\n }\n\n public String getEmpSalary() {\n return empSalary;\n }\n\n public void setEmpSalary(String empSalary) {\n this.empSalary = empSalary;\n }\n\n @Override\n public String toString() {\n return "Employee{" +\n "empId=" + empId +\n ", empName='" + empName + '\\'' +\n ", empSalary='" + empSalary + '\\'' +\n '}';\n }\n}\n<\/code><\/pre>\n2\u3001\u51c6\u5907\u63a5\u53e3<\/p>\n
package com.atgui.mapper;\n\nimport com.atgui.pojo.Employee;\nimport org.apache.ibatis.annotations.Param;\n\nimport java.util.List;\n\npublic interface EmployeeMapper {\n\n List<Employee> query(@Param("name") String name,@Param("salary") Double salary);\n}\n<\/code><\/pre>\n3\u3001\u51c6\u5907employee.xml<\/p>\n
<?xml version="1.0" encoding="UTF-8" ?>\n<!DOCTYPE mapper\n PUBLIC "-\/\/mybatis.org\/\/DTD Mapper 3.0\/\/EN"\n "https:\/\/mybatis.org\/dtd\/mybatis-3-mapper.dtd">\n<!-- namespace\u7b49\u4e8emapper\u63a5\u53e3\u7c7b\u7684\u5168\u9650\u5b9a\u540d,\u8fd9\u6837\u5b9e\u73b0\u5bf9\u5e94 -->\n<mapper namespace="com.atgui.mapper.EmployeeMapper">\n\n<!--\n \u573a\u666f\uff1a\u5982\u679c\u4f20\u5165\u5c5e\u6027\uff0c\u5c31\u5224\u65ad\u76f8\u7b49\uff0c\u5982\u679c\u4e0d\u4f20\u5165\uff0c\u5c31\u4e0d\u52a0\u5bf9\u5e94\u7684\u6761\u4ef6\n where\n if \u5224\u65ad\u4f20\u5165\u7684\u53c2\u6570\uff0c\u6700\u7ec8\u662f\u5426\u6dfb\u52a0\u8bed\u53e5\n test\u5c5e\u6027\uff1a \u5185\u90e8\u505a\u6bd4\u8f83\u8fd0\u7b97\uff0c\u6700\u7ec8true\u5c06\u6807\u7b7e\u5185\u7684sql\u8bed\u53e5\u8fdb\u884c\u62fc\u63a5\u3002\u5982\u679c\u4e3afalse\u5c31\u4e0d\u62fc\u63a5\n\n \u5224\u65ad\u8bed\u53e5\uff1a\u201ckey \u6bd4\u8f83\u7b26\u53f7 \u503c and | or key \u6bd4\u8f83\u7b26\u53f7 \u503c \u201d\n \u5927\u4e8e\u5c0f\u4e8e\u4e0d\u63a8\u8350\u76f4\u63a5\u4f7f\u7528\u7b26\u53f7\u3002\u4e00\u822c\u7528\u5b9e\u4f53\u7b26\u53f7\u6765\u8868\u793a \u5927\u4e8e\uff1a> \u5c0f\u4e8e\uff1a <\n\n \u8fd8\u6709\u9047\u5230\u7684\u95ee\u9898\n \u5982\u679c\u4e24\u4e2a\u6761\u4ef6\u90fd\u6ee1\u8db3\n \u5982\u679c\u7b2c\u4e00\u4e2a\u6761\u4ef6\u6ee1\u8db3 emp_name = #{name}\n \u5982\u679c\u7b2c\u4e00\u4e2a\u6761\u4ef6\u4e0d\u6ee1\u8db3\uff0c\u7b2c\u4e8c\u4e2a\u6761\u4ef6\u6ee1\u8db3\n \u5982\u679c\u4e24\u4e2a\u90fd\u4e0d\u6ee1\u8db3\n\n \u89e3\u51b3\uff1a\u8fd9\u91cc\u6211\u4eec\u8981\u7528 where\u6807\u7b7e\n where\u597d\u5904\uff1a\n 1\u3001\u81ea\u52a8\u6dfb\u52a0where\u5173\u952e\u5b57 where\u5185\u90e8\u6709\u4efb\u4f55\u4e00\u4e2aif\u6ee1\u8db3\uff0c\u5c31\u81ea\u52a8\u6dfb\u52a0where\u5173\u952e\u5b57\uff0c\u5426\u5219\u53bb\u6389\n 2\u3001\u81ea\u52a8\u53bb\u6389\u591a\u4f59\u7684and \u548cor\n-->\n\n <select id="query" resultType="employee">\n select * from t_emp\n <where>\n <if test="name!=null">\n emp_name = #{name}\n <\/if>\n <if test="salary !=null and salary >100 ">\n and emp_salary =#{salary}\n <\/if>\n <\/where>\n <\/select>\n\n<\/mapper><\/code><\/pre>\n4\u3001\u51c6\u5907mybatis-config.xml<\/p>\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<!-- \u8ba9mybatis\u5f00\u542f\u65e5\u5fd7\u8f93\u51fa-->\n <settings>\n<!-- \u8fd9\u91cc\u8bbe\u7f6e\u7684\u662f\u9009\u62e9\u7528system\u8fdb\u884c\u65e5\u5fd7\u8f93\u51fa-->\n <setting name="logImpl" value="STDOUT_LOGGING"\/>\n\n<!-- \u5f00\u542f\u9a7c\u5cf0\u5f0f\u81ea\u52a8\u6620\u5c04-->\n <setting name="mapUnderscoreToCamelCase" value="true"\/>\n\n <!--\u5f00\u542fresultMap\u81ea\u52a8\u6620\u5c04 -->\n <setting name="autoMappingBehavior" value="FULL"\/>\n <\/settings>\n\n<!-- \u5b9a\u4e49\u81ea\u5df1\u7c7b\u7684\u522b\u540d-->\n <typeAliases>\n<!-- \u5355\u72ec\u5b9a\u4e49-->\n<!-- <typeAlias type="com.atgui.pojo.Employee" alias="suibian"\/>-->\n<!-- \u6279\u91cf\u5b9a\u4e49-->\n <package name="com.atgui.pojo"\/>\n <\/typeAliases>\n\n <!-- environments\u8868\u793a\u914d\u7f6eMybatis\u7684\u5f00\u53d1\u73af\u5883\uff0c\u53ef\u4ee5\u914d\u7f6e\u591a\u4e2a\u73af\u5883\uff0c\u5728\u4f17\u591a\u5177\u4f53\u73af\u5883\u4e2d\uff0c\u4f7f\u7528default\u5c5e\u6027\u6307\u5b9a\u5b9e\u9645\u8fd0\u884c\u65f6\u4f7f\u7528\u7684\u73af\u5883\u3002default\u5c5e\u6027\u7684\u53d6\u503c\u662fenvironment\u6807\u7b7e\u7684id\u5c5e\u6027\u7684\u503c\u3002 -->\n <environments default="development">\n <!-- environment\u8868\u793a\u914d\u7f6eMybatis\u7684\u4e00\u4e2a\u5177\u4f53\u7684\u73af\u5883 -->\n <environment id="development">\n <!-- Mybatis\u7684\u5185\u7f6e\u7684\u4e8b\u52a1\u7ba1\u7406\u5668 -->\n <transactionManager type="JDBC"\/>\n <!-- \u914d\u7f6e\u6570\u636e\u6e90 -->\n <dataSource type="POOLED">\n <!-- \u5efa\u7acb\u6570\u636e\u5e93\u8fde\u63a5\u7684\u5177\u4f53\u4fe1\u606f -->\n <property name="driver" value="com.mysql.cj.jdbc.Driver"\/>\n <property name="url" value="jdbc:mysql:\/\/localhost:3306\/mybatis-example"\/>\n <property name="username" value="root"\/>\n <property name="password" value="root"\/>\n <\/dataSource>\n <\/environment>\n <\/environments>\n\n <mappers>\n <!-- Mapper\u6ce8\u518c\uff1a\u6307\u5b9aMybatis\u6620\u5c04\u6587\u4ef6\u7684\u5177\u4f53\u4f4d\u7f6e -->\n <!-- mapper\u6807\u7b7e\uff1a\u914d\u7f6e\u4e00\u4e2a\u5177\u4f53\u7684Mapper\u6620\u5c04\u6587\u4ef6 -->\n <!-- resource\u5c5e\u6027\uff1a\u6307\u5b9aMapper\u6620\u5c04\u6587\u4ef6\u7684\u5b9e\u9645\u5b58\u50a8\u4f4d\u7f6e\uff0c\u8fd9\u91cc\u9700\u8981\u4f7f\u7528\u4e00\u4e2a\u4ee5\u7c7b\u8def\u5f84\u6839\u76ee\u5f55\u4e3a\u57fa\u51c6\u7684\u76f8\u5bf9\u8def\u5f84 -->\n <!-- \u5bf9Maven\u5de5\u7a0b\u7684\u76ee\u5f55\u7ed3\u6784\u6765\u8bf4\uff0cresources\u76ee\u5f55\u4e0b\u7684\u5185\u5bb9\u4f1a\u76f4\u63a5\u653e\u5165\u7c7b\u8def\u5f84\uff0c\u6240\u4ee5\u8fd9\u91cc\u6211\u4eec\u53ef\u4ee5\u4ee5resources\u76ee\u5f55\u4e3a\u57fa\u51c6 -->\n <mapper resource="mappers\/EmployeeMapper.xml"\/>\n\n <\/mappers>\n\n<\/configuration><\/code><\/pre>\n5\u3001\u6d4b\u8bd5<\/p>\n
package com.atgui;\n\nimport com.atgui.mapper.EmployeeMapper;\nimport com.atgui.pojo.Employee;\nimport org.apache.ibatis.io.Resources;\nimport org.apache.ibatis.session.SqlSession;\nimport org.apache.ibatis.session.SqlSessionFactory;\nimport org.apache.ibatis.session.SqlSessionFactoryBuilder;\nimport org.junit.jupiter.api.AfterEach;\nimport org.junit.jupiter.api.BeforeEach;\nimport org.junit.jupiter.api.Test;\n\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.util.List;\n\npublic class mybatisTest {\n private SqlSession sqlSession;\n\n \/\/ \u6bcf\u6b21\u6d4b\u8bd5\u65b9\u6cd5\u6267\u884c\u524d\u90fd\u4f1a\u6267\u884c\u8be5\u4ee3\u7801\n @BeforeEach\n public void before() throws IOException {\n InputStream inputStream = Resources.getResourceAsStream("mybatis-config.xml");\n SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);\n sqlSession = sqlSessionFactory.openSession(true);\n }\n\n \/\/\u6bcf\u6b21\u6d4b\u8bd5\u65b9\u6cd5\u6267\u884c\u540e\u90fd\u4f1a\u6267\u884c\u8be5\u4ee3\u7801\n @AfterEach\n public void clean(){\n sqlSession.close();\n }\n\n @Test\n public void test1(){\n EmployeeMapper employeeMapper = sqlSession.getMapper(EmployeeMapper.class);\n List<Employee> list = employeeMapper.query(null,100.0);\n System.out.println("list = " + list);\n }\n}<\/code><\/pre>\n3\u3001set\u6807\u7b7e<\/h2>\n1\u3001\u4f5c\u7528<\/h3>\n
1\u3001 \u4f7f\u7528set\u6807\u7b7e\u52a8\u6001\u7ba1\u7406set\u5b50\u53e5\uff0c\u5e76\u4e14\u52a8\u6001\u53bb\u6389\u4e24\u7aef\u591a\u4f59\u7684\u9017\u53f7<\/p>\n
2\u3001\u4f1a\u81ea\u52a8\u6dfb\u52a0set\u5173\u952e\u5b57<\/p>\n
2\u3001\u4f8b\u5b50<\/h3>\n
1\u3001\u4ee3\u7801<\/p>\n
<update id="update">\n update t_emp\n<!-- set\u4f5c\u7528\uff1a\n 1\u3001\u81ea\u52a8\u53bb\u6389\u591a\u4f59\u7684\uff0c\n 2\u3001\u81ea\u52a8\u6dfb\u52a0set\u5173\u952e\u5b57\n-->\n <set>\n <if test="empName!=null">\n emp_name = #{empName},\n <\/if>\n <if test="empSalary !=null">\n emp_salary = #{empSalary},\n <\/if>\n <\/set>\n <\/update><\/code><\/pre>\n4\u3001trim\u6807\u7b7e\uff08\u4e86\u89e3\uff09<\/h2>\n1\u3001\u4f5c\u7528<\/h3>\n
1\u3001\u76ee\u524d\u7684\u4f5c\u7528\u662f\u6765\u66ff\u4ee3where\u8bed\u53e5<\/p>\n
2\u3001\u53ef\u4ee5\u63a7\u5236\u6761\u4ef6\u90e8\u5206\u4e24\u7aef\u662f\u5426\u5305\u542b\u67d0\u4e9b\u5b57\u7b26\u4e32<\/p>\n
2\u3001\u5c5e\u6027<\/h3>\n\n- prefix\u5c5e\u6027\uff1a\u6307\u5b9a\u8981\u52a8\u6001\u6dfb\u52a0\u7684\u524d\u7f00<\/li>\n
- suffix\u5c5e\u6027\uff1a\u6307\u5b9a\u8981\u52a8\u6001\u6dfb\u52a0\u7684\u540e\u7f00<\/li>\n
- prefixOverrides\u5c5e\u6027\uff1a\u6307\u5b9a\u8981\u52a8\u6001\u53bb\u6389\u7684\u524d\u7f00\uff0c\u4f7f\u7528\u201c|\u201d\u5206\u9694\u6709\u53ef\u80fd\u7684\u591a\u4e2a\u503c<\/li>\n
- suffixOverrides\u5c5e\u6027\uff1a\u6307\u5b9a\u8981\u52a8\u6001\u53bb\u6389\u7684\u540e\u7f00\uff0c\u4f7f\u7528\u201c|\u201d\u5206\u9694\u6709\u53ef\u80fd\u7684\u591a\u4e2a\u503c<\/li>\n<\/ul>\n
3\u3001\u4f8b\u5b50<\/h3>\n<!-- List<Employee> selectEmployeeByConditionByTrim(Employee employee) -->\n<select id="selectEmployeeByConditionByTrim" resultType="com.atguigu.mybatis.entity.Employee">\n select emp_id,emp_name,emp_age,emp_salary,emp_gender\n from t_emp\n\n <!-- prefix\u5c5e\u6027\u6307\u5b9a\u8981\u52a8\u6001\u6dfb\u52a0\u7684\u524d\u7f00 -->\n <!-- suffix\u5c5e\u6027\u6307\u5b9a\u8981\u52a8\u6001\u6dfb\u52a0\u7684\u540e\u7f00 -->\n <!-- prefixOverrides\u5c5e\u6027\u6307\u5b9a\u8981\u52a8\u6001\u53bb\u6389\u7684\u524d\u7f00\uff0c\u4f7f\u7528\u201c|\u201d\u5206\u9694\u6709\u53ef\u80fd\u7684\u591a\u4e2a\u503c -->\n <!-- suffixOverrides\u5c5e\u6027\u6307\u5b9a\u8981\u52a8\u6001\u53bb\u6389\u7684\u540e\u7f00\uff0c\u4f7f\u7528\u201c|\u201d\u5206\u9694\u6709\u53ef\u80fd\u7684\u591a\u4e2a\u503c -->\n <!-- \u5f53\u524d\u4f8b\u5b50\u7528where\u6807\u7b7e\u5b9e\u73b0\u66f4\u7b80\u6d01\uff0c\u4f46\u662ftrim\u6807\u7b7e\u66f4\u7075\u6d3b\uff0c\u53ef\u4ee5\u7528\u5728\u4efb\u4f55\u6709\u9700\u8981\u7684\u5730\u65b9 -->\n <trim prefix="where" suffixOverrides="and|or">\n <if test="empName != null">\n emp_name=#{empName} and\n <\/if>\n <if test="empSalary > 3000">\n emp_salary>#{empSalary} and\n <\/if>\n <if test="empAge <= 20">\n emp_age=#{empAge} or\n <\/if>\n <if test="empGender=='male'">\n emp_gender=#{empGender}\n <\/if>\n <\/trim>\n<\/select><\/code><\/pre>\n5\u3001choose\/when\/otherwise\u6807\u7b7e<\/h2>\n1\u3001\u4f5c\u7528<\/h3>\n
1\u3001\u5728\u591a\u5206\u652f\u6761\u4ef6\u4e0a\uff0c\u4ec5\u6267\u884c\u4e00\u4e2a<\/p>\n
\n- \u4ece\u4e0a\u5230\u4e0b\u4f9d\u6b21\u6267\u884c\u6761\u4ef6\u5224\u65ad<\/li>\n
- \u9047\u5230\u7684\u7b2c\u4e00\u4e2a\u6ee1\u8db3\u6761\u4ef6\u7684\u5206\u652f\u4f1a\u88ab\u91c7\u7eb3<\/li>\n
- \u88ab\u91c7\u7eb3\u5206\u652f\u540e\u9762\u7684\u5206\u652f\u90fd\u5c06\u4e0d\u88ab\u8003\u8651<\/li>\n
- \u5982\u679c\u6240\u6709\u7684when\u5206\u652f\u90fd\u4e0d\u6ee1\u8db3\uff0c\u90a3\u4e48\u5c31\u6267\u884cotherwise\u5206\u652f<\/li>\n<\/ul>\n
2\u3001\u4f8b\u5b50<\/h3>\n<select id="selectEmployeeByConditionByChoose" resultType="employee">\n select emp_id ,emp_name,emp_salary\n from t_emp\n where\n <choose>\n <when test="enpName != null">\n emp_name =#{empName}\n <\/when>\n <\/choose>\n <\/select><\/code><\/pre>\n6\u3001foreach\u6807\u7b7e<\/h2>\n1\u3001\u57fa\u672c\u7528\u6cd5<\/h3>\n
1\u3001\u5c5e\u6027<\/p>\n
\n- 1\u3001collection\uff1a\u8981\u904d\u5386\u7684\u96c6\u5408<\/li>\n
- 2\u3001open\uff1a\u904d\u5386\u4e4b\u524d\u8ffd\u52a0\u7684\u5b57\u7b26\u4e32<\/li>\n
- 3\u3001close\uff1a\u904d\u5386\u7ed3\u675f\u9700\u8981\u6dfb\u52a0\u7684\u5b57\u7b26\u4e32<\/li>\n
- 4\u3001separator\uff1a\u6bcf\u6b21\u904d\u5386\u7684\u5206\u5272\u7b26\u53f7\uff0c\u5982\u679c\u662f\u6700\u540e\u4e00\u6b21\uff0c\u4e0d\u4f1a\u8ffd\u52a0<\/li>\n
- 5\u3001item\uff1a\u83b7\u53d6\u6bcf\u4e2a\u904d\u5386\u9879<\/li>\n<\/ul>\n
2\u3001\u5c31\u662f\u627e\u89c4\u5f8b\uff0c\u770bsql\u8bed\u53e5\u54ea\u4e9b\u80fd\u591f\u7528foreach\u5957\u7528\u7136\u540e\u904d\u5386<\/p>\n
2\u3001\u6ce8\u610f<\/h3>\n
1\u3001\u5982\u679c\u90fd\u6ca1\u6709\u89c4\u5f8b\uff0c\u5c31\u628a\u6574\u4e2asql\u8bed\u53e5\u5305\u88f9\u8d77\u6765\uff0c\u6574\u4f53\u5faa\u73af<\/p>\n
2\u3001\u6709\u4e2a\u524d\u63d0\uff1a\u9700\u8981\u5f00\u542f\u6279\u91cfsql\u8bed\u53e5\u6267\u884c\u7684\u8bed\u53e5<\/p>\n
3\u3001\u4fee\u6539jdbc\u914d\u7f6e<\/p>\n
<!-- \u914d\u7f6e\u6570\u636e\u6e90 -->\n <dataSource type="POOLED">\n <!-- \u5efa\u7acb\u6570\u636e\u5e93\u8fde\u63a5\u7684\u5177\u4f53\u4fe1\u606f -->\n <property name="driver" value="com.mysql.cj.jdbc.Driver"\/>\n <property name="url" value="jdbc:mysql:\/\/localhost:3306\/mybatis-example?allowMultiQueries=true"\/>\n <property name="username" value="root"\/>\n <property name="password" value="root"\/>\n <\/dataSource><\/code><\/pre>\n4\u3001\u8fd8\u6709\u5c31\u662fcollection\u5c5e\u6027\u3002\u5efa\u8bae\u7528@Param\u6ce8\u89e3\u6307\u5b9a\u4e00\u4e2a\u5177\u4f53\u540d\u5b57\u3002\u5426\u5219\u96be\u7406\u89e3<\/p>\n
5\u3001\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\uff0c\u4e3a\u4e86\u907f\u514d\u9690\u6666\u7684\u8868\u8fbe\u9020\u6210\u4e00\u5b9a\u7684\u8bef\u4f1a\uff0c\u5efa\u8bae\u4f7f\u7528@Param\u6ce8\u89e3\u660e\u786e\u58f0\u660e\u53d8\u91cf\u7684\u540d\u79f0\uff0c\u7136\u540e\u5728foreach\u6807\u7b7e\u7684collection\u5c5e\u6027\u4e2d\u6309\u7167@Param\u6ce8\u89e3\u6307\u5b9a\u7684\u540d\u79f0\u6765\u5f15\u7528\u4f20\u5165\u7684\u53c2\u6570\u3002<\/p>\n
3\u3001\u4f8b\u5b50<\/h3>\n
1\u3001mapper\u63a5\u53e3\u6587\u4ef6<\/p>\n
\/\/ \u6839\u636eid\u7684\u6279\u91cf\u67e5\u8be2\n List<Employee> queryBatch(@Param("ids") List<Integer> ids);\n\/\/ \u6839\u636eid\u7684\u6279\u91cf\u5220\u9664\n int deleteBatch(@Param("ids") List<Integer> ids);\n\/\/ \u6279\u91cf\u6dfb\u52a0\n int insertBatch(@Param("list") List<Employee> employeeList);\n\/\/ \u6279\u91cf\u4fee\u6539\n int updateBatch(@Param("list") List<Employee> employeeList);<\/code><\/pre>\n2\u3001sql\u8bed\u53e5<\/p>\n
<!-- List<Employee> queryBatch(@Param("ids") List<Integer> ids);-->\n <select id="queryBatch" resultType="employee">\n select * from t_emp\n where emp_id in\n <foreach collection="ids" open="(" separator="," close=")" item="id">\n #{id}\n <\/foreach>\n <\/select>\n\n<!-- int deleteBatch(@Param("ids") List<Integer> ids);-->\n <delete id="deleteBatch">\n delete from t_emp where id in\n <foreach collection="ids" open="(" close=")" item="id">\n #{id}\n <\/foreach>\n <\/delete>\n\n<!-- int insertBatch(@Param("list") List<Employee> employeeList);-->\n <insert id="insertBatch">\n insert into t_emp (emp_name,emp_salary)\n values\n <foreach collection="list" separator="," item="employee">\n (#{employee.empName),#{employee.empSalary})\n <\/foreach>\n <\/insert>\n\n<!-- int updateBatch(@Param("list") List<Employee> employeeList);-->\n <update id="updateBatch">\n <foreach collection="list" item="emp">\n update t_emp set emp_name =#{emp.empName},emp_salary = #{emp.Salary}\n where emp_id = #{emp.empId)\n <\/foreach>\n <\/update><\/code><\/pre>\n7\u3001sql\u7247\u6bb5<\/h2>\n1\u3001\u4f5c\u7528<\/h3>\n
1\u3001\u62bd\u53d6\u91cd\u590d\u7684sql\u7247\u6bb5\uff08\u7c7b\u4f3c\u5c01\u88c5\uff09<\/p>\n
2\u3001\u7528\u5230\\\u6807\u7b7e<\/p>\n3\u3001\\\u6807\u7b7e<\/p>\n2\u3001\u4f8b\u5b50<\/h3>\n
1\u3001sql\u8bed\u53e5<\/p>\n
<!-- List<Employee> queryBatch(@Param("ids") List<Integer> ids);-->\n\n <sql id="queryBatch11">\n select * from t_emp\n <\/sql>\n\n <select id="queryBatch1" resultType="employee">\n <include refid="queryBatch11"><\/include>\n where emp_id in\n <foreach collection="ids" open="(" separator="," close=")" item="id">\n #{id}\n <\/foreach>\n <\/select><\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"\u56db\u3001MyBatis\u52a8\u6001\u8bed\u53e5 1\u3001\u52a8\u6001\u8bed\u53e5\u9700\u6c42\u548c\u7b80\u4ecb 1\u3001\u9700\u6c42 1\u3001\u5e94\u5bf9\u591a\u4e2a\u6761\u4ef6\u67e5\u8be2\u3002 2\u3001\u6709\u5f88\u591a\u6761\u4ef6\u4e0d\u6ee1\u8db3\u7684\u3002 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12],"tags":[],"class_list":["post-5810","post","type-post","status-publish","format-standard","hentry","category-mybatis"],"_links":{"self":[{"href":"http:\/\/zyg.luchers.cn\/index.php\/wp-json\/wp\/v2\/posts\/5810","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/zyg.luchers.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/zyg.luchers.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/zyg.luchers.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/zyg.luchers.cn\/index.php\/wp-json\/wp\/v2\/comments?post=5810"}],"version-history":[{"count":1,"href":"http:\/\/zyg.luchers.cn\/index.php\/wp-json\/wp\/v2\/posts\/5810\/revisions"}],"predecessor-version":[{"id":5811,"href":"http:\/\/zyg.luchers.cn\/index.php\/wp-json\/wp\/v2\/posts\/5810\/revisions\/5811"}],"wp:attachment":[{"href":"http:\/\/zyg.luchers.cn\/index.php\/wp-json\/wp\/v2\/media?parent=5810"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/zyg.luchers.cn\/index.php\/wp-json\/wp\/v2\/categories?post=5810"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/zyg.luchers.cn\/index.php\/wp-json\/wp\/v2\/tags?post=5810"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}