IDEA+SpringBoot MyBatis Dynamic SQL的初体验（一)
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Mybatis generator在2017年12月发布了version 1.3.6，在该版本添加了新的TargetRuntime：
MyBatis Dynamic SQL（mybatis 动态SQL）
Mybatis Dynamic Sql与以前TargetRuntime相比较：
- 移除了XXXExamle类和xml文件，代价是不兼容其他的TargetRuntime
- java版本限制，生成器将需要运行Java 8，低版本可能会出现错误
- 代码逻辑相对以前，使用了 lambda表达式，是的较容易理解
- 移除了iBatis2代码生成的支持
本文将用Intellij IDEA为编译器，Gradle作为项目管理器(个人觉得gradle相对maven来说，代码少太多了)，试用Mybatis Dynamic SQL
第一步，安装Intellij IDEA, 请自行百度
第二步，安装Gradle，可忽略IDEA会自行下载
第三步，创建SpringBoot Gradle项目
项目创建成功
点击import Changes自动下包
项目初始结构如下
在resources下建立mybatis-generator.xml
1 <?xml version="1.0" encoding="UTF-8"?> 2 <!DOCTYPE generatorConfiguration PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN" 3 "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd"> 4 <generatorConfiguration> 5 <!--mybatis targetRuntime选择 该测试需要MyBatis3DynamicSQL--> 6 <context id="mysql" targetRuntime="MyBatis3DynamicSQL"> 7 <commentGenerator> 8 <property name="suppressAllComments" value="true"/> 9 <property name="suppressDate" value="true"/> 10 </commentGenerator> 11 <!--数据库连接--> 12 <jdbcConnection driverClass="com.mysql.cj.jdbc.Driver" 13 connectionURL="jdbc:mysql://localhost:3306/nice_test?serverTimezone=UTC&useSSL=false" 14 userId="pigge" password="123456"/> 15 <!--类型解析器--> 16 <javaTypeResolver type="org.mybatis.generator.internal.types.JavaTypeResolverDefaultImpl"> 17 <!--是否对整型进行分类--> 18 <property name="forceBigDecimals" value="true"/> 19 <!--是否试用jdk8时间类--> 20 <property name="useJSR310Types" value="true"/> 21 </javaTypeResolver> 22 <!--java实体类生成配置--> 23 <javaModelGenerator targetPackage="com.pigge.mybatistest.entity" targetProject="src\\main\\java"> 24 <!--此属性用于选择MyBatis Generator是否将根据内省表的目录和架构为对象生成不同的Java包。--> 25 <property name="enableSubPackages" value="true"/> 26 <!--去除字段空格--> 27 <property name="trimStrings" value="true"/> 28 </javaModelGenerator> 29 <!--mapper生成配置--> 30 <javaClientGenerator type="ANNOTATEDMAPPER" targetPackage="com.pigge.mybatistest.mapper" targetProject="src\\main\\java"> 31 <!--此属性用于选择MyBatis Generator是否将根据内省表的目录和架构为对象生成不同的Java包。--> 32 <property name="enableSubPackages" value="true"/> 33 </javaClientGenerator> 34 <!--数据表的选择--> 35 <table schema="nice_test" tableName="user"/> 36 <table schema="nice_test" tableName="role"/> 37 <table schema="nice_test" tableName="authority"/> 38 <table schema="nice_test" tableName="login_record"/> 39 </context> 40 </generatorConfiguration>
在java下新建util包和MybatisGenerator.java文件
package com.pigge.mybatistest.util; import org.mybatis.generator.api.MyBatisGenerator; import org.mybatis.generator.config.Configuration; import org.mybatis.generator.config.xml.ConfigurationParser; import org.mybatis.generator.exception.InvalidConfigurationException; import org.mybatis.generator.exception.XMLParserException; import org.mybatis.generator.internal.DefaultShellCallback; import java.io.File; import java.io.IOException; import java.sql.SQLException; import java.util.ArrayList; import java.util.List; public class MybatisGenerator { public static void main(String[] args) throws IOException, XMLParserException, InvalidConfigurationException, SQLException, InterruptedException { String classpath = MybatisGenerator.class.getResource("/").getPath(); String filename = "mybatis-generator.xml"; File file = new File(classpath + filename); if(!file.exists()){ //找不到文件 切换路径 classpath = classpath.replace("classes", "resources"); file = new File(classpath + filename); } List<String> warnings = new ArrayList<>(); ConfigurationParser cp = new ConfigurationParser(warnings); Configuration config = cp.parseConfiguration(file); DefaultShellCallback callback = new DefaultShellCallback(true); MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config, callback, warnings); myBatisGenerator.generate(null); } }
执行MybatisGenerator的main方法，将生成mybatis dynamic 代码
其样式为
实体类
package com.pigge.entity; import java.time.LocalDateTime; import javax.annotation.Generated; public class Role { @Generated("org.mybatis.generator.api.MyBatisGenerator") private Integer id; @Generated("org.mybatis.generator.api.MyBatisGenerator") private String name; @Generated("org.mybatis.generator.api.MyBatisGenerator") private String authorityIds; @Generated("org.mybatis.generator.api.MyBatisGenerator") private Integer createUserId; @Generated("org.mybatis.generator.api.MyBatisGenerator") private LocalDateTime createTime; @Generated("org.mybatis.generator.api.MyBatisGenerator") private LocalDateTime expireTime; @Generated("org.mybatis.generator.api.MyBatisGenerator") private Boolean due; @Generated("org.mybatis.generator.api.MyBatisGenerator") public Integer getId() { return id; } @Generated("org.mybatis.generator.api.MyBatisGenerator") public void setId(Integer id) { this.id = id; } //剩下的getter setter方法省略 }
mapper类 代码过长 不建议打开
1 package com.pigge.mapper; 2 3 import static com.pigge.mapper.RoleDynamicSqlSupport.*; 4 import static org.mybatis.dynamic.sql.SqlBuilder.*; 5 6 import com.pigge.entity.Role; 7 import java.util.List; 8 import javax.annotation.Generated; 9 import org.apache.ibatis.annotations.DeleteProvider; 10 import org.apache.ibatis.annotations.InsertProvider; 11 import org.apache.ibatis.annotations.Mapper; 12 import org.apache.ibatis.annotations.Result; 13 import org.apache.ibatis.annotations.ResultMap; 14 import org.apache.ibatis.annotations.Results; 15 import org.apache.ibatis.annotations.SelectProvider; 16 import org.apache.ibatis.annotations.UpdateProvider; 17 import org.apache.ibatis.type.JdbcType; 18 import org.mybatis.dynamic.sql.SqlBuilder; 19 import org.mybatis.dynamic.sql.delete.DeleteDSL; 20 import org.mybatis.dynamic.sql.delete.MyBatis3DeleteModelAdapter; 21 import org.mybatis.dynamic.sql.delete.render.DeleteStatementProvider; 22 import org.mybatis.dynamic.sql.insert.render.InsertStatementProvider; 23 import org.mybatis.dynamic.sql.render.RenderingStrategy; 24 import org.mybatis.dynamic.sql.select.MyBatis3SelectModelAdapter; 25 import org.mybatis.dynamic.sql.select.QueryExpressionDSL; 26 import org.mybatis.dynamic.sql.select.SelectDSL; 27 import org.mybatis.dynamic.sql.select.render.SelectStatementProvider; 28 import org.mybatis.dynamic.sql.update.MyBatis3UpdateModelAdapter; 29 import org.mybatis.dynamic.sql.update.UpdateDSL; 30 import org.mybatis.dynamic.sql.update.render.UpdateStatementProvider; 31 import org.mybatis.dynamic.sql.util.SqlProviderAdapter; 32 33 @Mapper 34 public interface RoleMapper { 35 @Generated("org.mybatis.generator.api.MyBatisGenerator") 36 @SelectProvider(type=SqlProviderAdapter.class, method="select") 37 long count(SelectStatementProvider selectStatement); 38 39 @Generated("org.mybatis.generator.api.MyBatisGenerator") 40 @DeleteProvider(type=SqlProviderAdapter.class, method="delete") 41 int delete(DeleteStatementProvider deleteStatement); 42 43 @Generated("org.mybatis.generator.api.MyBatisGenerator") 44 @InsertProvider(type=SqlProviderAdapter.class, method="insert") 45 int insert(InsertStatementProvider<Role> insertStatement); 46 47 @Generated("org.mybatis.generator.api.MyBatisGenerator") 48 @SelectProvider(type=SqlProviderAdapter.class, method="select") 49 @ResultMap("RoleResult") 50 Role selectOne(SelectStatementProvider selectStatement); 51 52 @Generated("org.mybatis.generator.api.MyBatisGenerator") 53 @SelectProvider(type=SqlProviderAdapter.class, method="select") 54 @Results(id="RoleResult", value = { 55 @Result(column="id", property="id", jdbcType=JdbcType.INTEGER, id=true), 56 @Result(column="name", property="name", jdbcType=JdbcType.VARCHAR), 57 @Result(column="authority_ids", property="authorityIds", jdbcType=JdbcType.VARCHAR), 58 @Result(column="create_user_id", property="createUserId", jdbcType=JdbcType.INTEGER), 59 @Result(column="create_time", property="createTime", jdbcType=JdbcType.TIMESTAMP), 60 @Result(column="expire_time", property="expireTime", jdbcType=JdbcType.TIMESTAMP), 61 @Result(column="due", property="due", jdbcType=JdbcType.BIT) 62 }) 63 List<Role> selectMany(SelectStatementProvider selectStatement); 64 65 @Generated("org.mybatis.generator.api.MyBatisGenerator") 66 @UpdateProvider(type=SqlProviderAdapter.class, method="update") 67 int update(UpdateStatementProvider updateStatement); 68 69 @Generated("org.mybatis.generator.api.MyBatisGenerator") 70 default QueryExpressionDSL<MyBatis3SelectModelAdapter<Long>> countByExample() { 71 return SelectDSL.selectWithMapper(this::count, SqlBuilder.count()) 72 .from(role); 73 } 74 75 @Generated("org.mybatis.generator.api.MyBatisGenerator") 76 default DeleteDSL<MyBatis3DeleteModelAdapter<Integer>> deleteByExample() { 77 return DeleteDSL.deleteFromWithMapper(this::delete, role); 78 } 79 80 @Generated("org.mybatis.generator.api.MyBatisGenerator") 81 default int deleteByPrimaryKey(Integer id_) { 82 return DeleteDSL.deleteFromWithMapper(this::delete, role) 83 .where(id, isEqualTo(id_)) 84 .build() 85 .execute(); 86 } 87 88 @Generated("org.mybatis.generator.api.MyBatisGenerator") 89 default int insert(Role record) { 90 return insert(SqlBuilder.insert(record) 91 .into(role) 92 .map(id).toProperty("id") 93 .map(name).toProperty("name") 94 .map(authorityIds).toProperty("authorityIds") 95 .map(createUserId).toProperty("createUserId") 96 .map(createTime).toProperty("createTime") 97 .map(expireTime).toProperty("expireTime") 98 .map(due).toProperty("due") 99 .build() 100 .render(RenderingStrategy.MYBATIS3)); 101 } 102 103 @Generated("org.mybatis.generator.api.MyBatisGenerator") 104 default int insertSelective(Role record) { 105 return insert(SqlBuilder.insert(record) 106 .into(role) 107 .map(id).toPropertyWhenPresent("id", record::getId) 108 .map(name).toPropertyWhenPresent("name", record::getName) 109 .map(authorityIds).toPropertyWhenPresent("authorityIds", record::getAuthorityIds) 110 .map(createUserId).toPropertyWhenPresent("createUserId", record::getCreateUserId) 111 .map(createTime).toPropertyWhenPresent("createTime", record::getCreateTime) 112 .map(expireTime).toPropertyWhenPresent("expireTime", record::getExpireTime) 113 .map(due).toPropertyWhenPresent("due", record::getDue) 114 .build() 115 .render(RenderingStrategy.MYBATIS3)); 116 } 117 118 @Generated("org.mybatis.generator.api.MyBatisGenerator") 119 default QueryExpressionDSL<MyBatis3SelectModelAdapter<List<Role>>> selectByExample() { 120 return SelectDSL.selectWithMapper(this::selectMany, id, name, authorityIds, createUserId, createTime, expireTime, due) 121 .from(role); 122 } 123 124 @Generated("org.mybatis.generator.api.MyBatisGenerator") 125 default QueryExpressionDSL<MyBatis3SelectModelAdapter<List<Role>>> selectDistinctByExample() { 126 return SelectDSL.selectDistinctWithMapper(this::selectMany, id, name, authorityIds, createUserId, createTime, expireTime, due) 127 .from(role); 128 } 129 130 @Generated("org.mybatis.generator.api.MyBatisGenerator") 131 default Role selectByPrimaryKey(Integer id_) { 132 return SelectDSL.selectWithMapper(this::selectOne, id, name, authorityIds, createUserId, createTime, expireTime, due) 133 .from(role) 134 .where(id, isEqualTo(id_)) 135 .build() 136 .execute(); 137 } 138 139 @Generated("org.mybatis.generator.api.MyBatisGenerator") 140 default UpdateDSL<MyBatis3UpdateModelAdapter<Integer>> updateByExample(Role record) { 141 return UpdateDSL.updateWithMapper(this::update, role) 142 .set(id).equalTo(record::getId) 143 .set(name).equalTo(record::getName) 144 .set(authorityIds).equalTo(record::getAuthorityIds) 145 .set(createUserId).equalTo(record::getCreateUserId) 146 .set(createTime).equalTo(record::getCreateTime) 147 .set(expireTime).equalTo(record::getExpireTime) 148 .set(due).equalTo(record::getDue); 149 } 150 151 @Generated("org.mybatis.generator.api.MyBatisGenerator") 152 default UpdateDSL<MyBatis3UpdateModelAdapter<Integer>> updateByExampleSelective(Role record) { 153 return UpdateDSL.updateWithMapper(this::update, role) 154 .set(id).equalToWhenPresent(record::getId) 155 .set(name).equalToWhenPresent(record::getName) 156 .set(authorityIds).equalToWhenPresent(record::getAuthorityIds) 157 .set(createUserId).equalToWhenPresent(record::getCreateUserId) 158 .set(createTime).equalToWhenPresent(record::getCreateTime) 159 .set(expireTime).equalToWhenPresent(record::getExpireTime) 160 .set(due).equalToWhenPresent(record::getDue); 161 } 162 163 @Generated("org.mybatis.generator.api.MyBatisGenerator") 164 default int updateByPrimaryKey(Role record) { 165 return UpdateDSL.updateWithMapper(this::update, role) 166 .set(name).equalTo(record::getName) 167 .set(authorityIds).equalTo(record::getAuthorityIds) 168 .set(createUserId).equalTo(record::getCreateUserId) 169 .set(createTime).equalTo(record::getCreateTime) 170 .set(expireTime).equalTo(record::getExpireTime) 171 .set(due).equalTo(record::getDue) 172 .where(id, isEqualTo(record::getId)) 173 .build() 174 .execute(); 175 } 176 177 @Generated("org.mybatis.generator.api.MyBatisGenerator") 178 default int updateByPrimaryKeySelective(Role record) { 179 return UpdateDSL.updateWithMapper(this::update, role) 180 .set(name).equalToWhenPresent(record::getName) 181 .set(authorityIds).equalToWhenPresent(record::getAuthorityIds) 182 .set(createUserId).equalToWhenPresent(record::getCreateUserId) 183 .set(createTime).equalToWhenPresent(record::getCreateTime) 184 .set(expireTime).equalToWhenPresent(record::getExpireTime) 185 .set(due).equalToWhenPresent(record::getDue) 186 .where(id, isEqualTo(record::getId)) 187 .build() 188 .execute(); 189 } 190 }
Support类 不多可以打开
1 package com.pigge.mapper; 2 3 import java.sql.JDBCType; 4 import java.time.LocalDateTime; 5 import javax.annotation.Generated; 6 import org.mybatis.dynamic.sql.SqlColumn; 7 import org.mybatis.dynamic.sql.SqlTable; 8 9 public final class RoleDynamicSqlSupport { 10 @Generated("org.mybatis.generator.api.MyBatisGenerator") 11 public static final Role role = new Role(); 12 13 @Generated("org.mybatis.generator.api.MyBatisGenerator") 14 public static final SqlColumn<Integer> id = role.id; 15 16 @Generated("org.mybatis.generator.api.MyBatisGenerator") 17 public static final SqlColumn<String> name = role.name; 18 19 @Generated("org.mybatis.generator.api.MyBatisGenerator") 20 public static final SqlColumn<String> authorityIds = role.authorityIds; 21 22 @Generated("org.mybatis.generator.api.MyBatisGenerator") 23 public static final SqlColumn<Integer> createUserId = role.createUserId; 24 25 @Generated("org.mybatis.generator.api.MyBatisGenerator") 26 public static final SqlColumn<LocalDateTime> createTime = role.createTime; 27 28 @Generated("org.mybatis.generator.api.MyBatisGenerator") 29 public static final SqlColumn<LocalDateTime> expireTime = role.expireTime; 30 31 @Generated("org.mybatis.generator.api.MyBatisGenerator") 32 public static final SqlColumn<Boolean> due = role.due; 33 34 @Generated("org.mybatis.generator.api.MyBatisGenerator") 35 public static final class Role extends SqlTable { 36 public final SqlColumn<Integer> id = column("id", JDBCType.INTEGER); 37 38 public final SqlColumn<String> name = column("name", JDBCType.VARCHAR); 39 40 public final SqlColumn<String> authorityIds = column("authority_ids", JDBCType.VARCHAR); 41 42 public final SqlColumn<Integer> createUserId = column("create_user_id", JDBCType.INTEGER); 43 44 public final SqlColumn<LocalDateTime> createTime = column("create_time", JDBCType.TIMESTAMP); 45 46 public final SqlColumn<LocalDateTime> expireTime = column("expire_time", JDBCType.TIMESTAMP); 47 48 public final SqlColumn<Boolean> due = column("due", JDBCType.BIT); 49 50 public Role() { 51 super("role"); 52 } 53 } 54 }
至此，mybatis dynamic sql代码生成成功
项目地址 https://gitee.com/hjm0928/MybatisTest
如何使用请看IDEA+SpringBoot MyBatis Dynamic SQL的初体验（二)
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