MyBatis：Mybatis 参数传递用法
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之前文章中对in的用法做过讲解：《MyBatis(四)：mybatis中使用in查询时的注意事项》
实际上对于多个参数的用法也是这是注意的：
多参&if判空&List集合判空&in用法
@Options(useCache = true, flushCache = Options.FlushCachePolicy.FALSE, timeout = 60000) @Select(value = { "<script>", " SELECT `id`,`title` ", " FROM `tb_article` ", " WHERE `category_id`=#{article.categoryId} ", " <if test=\'article.status!=null\'>", " AND `status` = #{article.status} ", " </if>", " <if test=\'typeList!=null and !typeList.isEmpty()\'>", " and `article_type` in", " <foreach collection=\\"typeList\\" index=\\"index\\" item=\\"item\\" open=\\"(\\" separator=\\",\\" close=\\")\\">", " #{item} ", " </foreach>", " </if>", "</script>" }) @ResultMap(value = {"articleResultMap"}) List<ArticlePo> queryByCondition(final @Param("article") ArticleModel article, final @Param("typeList") List<Integer> typeList);
1）上边主要对普通参数判断空用法：<if test=\'article.status!=null\'>
2）集合判空的用法：<if test=\'typeList!=null and !typeList.isEmpty()\'>
3）in的用法：<foreach collection=\\"typeList\\" index=\\"index\\" item=\\"item\\" open=\\"(\\" separator=\\",\\" close=\\")\\">"；
4）多参数用法，实际上多个参数如果使用@SqlProvider方式是，在ArticleSqlProvider的类中方法中接收的参数对象为Map<String,Object>,该map集合中包含两个对象：key:article的ArticleModel对象；key:typeList的List<Integer>对象。获取方式：ArticleModel aritlce=(ArticleModel)map.get("aritcle");List<Integer> typeList=(List<Integer>)map.get("typeList");。
Mybatis使用POJO传递参数：
@Options(useCache = true, flushCache = Options.FlushCachePolicy.FALSE, timeout = 60000) @ResultMap("logResult") @Select(value={ "<script>", "select * from `log` " , "<where>" , " <if test=\\"title!=null and title!=\'\'\\">" , " and `title` like CONCAT(\'%\', #{title}, \'%\') " , " </if>" , " <if test=\\"moduleType!=null \\">" , " and `module_type`=#{moduleType} " , " </if>" , " <if test=\\"operateType!=null \\">" , " and `operate_type`=#{operateType} " , " </if>" , "</where>", "</script>" }) List<Log> getByPojo(Log log);
src/main/resources/mybatis-config.xml
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"> <configuration> <!-- 引用db.properties配置文件 --> <properties resource="jdbc.properties"/> <!--配置全局属性--> <settings> <!-- 打开延迟加载的开关 --> <setting name="lazyLoadingEnabled" value="true"/> <!-- 将积极加载改为消极加载（即按需加载） --> <setting name="aggressiveLazyLoading" value="false"/> <!-- 打开全局缓存开关（二级缓存）默认值就是 true --> <setting name="cacheEnabled" value="true"/> <!--使用jdbc的getGeneratekeys获取自增主键值--> <setting name="useGeneratedKeys" value="true"/> <!--使用列别名替换别名 默认true select name as title form table; --> <setting name="useColumnLabel" value="true"/> <!--开启驼峰命名转换--> <setting name="mapUnderscoreToCamelCase" value="true"/> <!--打印sql日志--> <setting name="logImpl" value="STDOUT_LOGGING" /> </settings> <typeAliases> <package name="com.dx.test.model"/> </typeAliases> <!-- 元素类型为 "configuration" 的内容必须匹配 " (properties?,settings?,typeAliases?,typeHandlers?,objectFactory?,objectWrapperFactory?,reflectorFactory?, plugins?,environments?,databaseIdProvider?,mappers?)"。 --> <typeHandlers> <typeHandler handler="org.apache.ibatis.type.EnumOrdinalTypeHandler" javaType="com.dx.test.model.enums.ModuleType"/> <typeHandler handler="org.apache.ibatis.type.EnumOrdinalTypeHandler" javaType="com.dx.test.model.enums.OperateType"/> </typeHandlers> <!-- 对事务的管理和连接池的配置 --> <environments default="mysql_jdbc"> <environment id="mysql_jdbc"> <transactionManager type="JDBC"/> <dataSource type="POOLED"> <property name="driver" value="${driver}"/> <property name="url" value="${url}"/> <property name="username" value="${name}"/> <property name="password" value="${password}"/> </dataSource> </environment> </environments> <!-- <mappers> <mapper resource="resources/mapper/LogMapper.xml"/> </mappers> --> <mappers> <mapper class="com.dx.test.dao.LogMapper"></mapper> </mappers> </configuration>
src/main/resources/log.properties
log4j.rootLogger=DEBUG, Console #Console log4j.appender.Console=org.apache.log4j.ConsoleAppender log4j.appender.Console.layout=org.apache.log4j.PatternLayout log4j.appender.Console.layout.ConversionPattern=%d [%t] %-5p [%c] - %m%n log4j.logger.java.sql.ResultSet=INFO log4j.logger.org.apache=INFO log4j.logger.java.sql.Connection=DEBUG log4j.logger.java.sql.Statement=DEBUG log4j.logger.java.sql.PreparedStatement=DEBUG
src/main/resources/jdbc.properties
driver=com.mysql.cj.jdbc.Driver url=jdbc:mysql://localhost:3306/mydb?useUnicode=true&characterEncoding=utf8&serverTimezone=GMT%2B8&useSSL=false name=root password=123456
pom.xml
<!--MyBatis --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.4.6</version> </dependency> <!--MySql数据库驱动 --> <!-- https://mvnrepository.com/artifact/com.alibaba/druid --> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.1.21</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>8.0.11</version> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>3.8.1</version> <scope>test</scope> </dependency>
LogMapper.java（Mybatis mapper类）
package com.dx.test.dao; import java.util.List; import java.util.Map; import org.apache.ibatis.annotations.InsertProvider; import org.apache.ibatis.annotations.Mapper; import org.apache.ibatis.annotations.Options; import org.apache.ibatis.annotations.Param; import org.apache.ibatis.annotations.Result; import org.apache.ibatis.annotations.ResultMap; import org.apache.ibatis.annotations.Results; import org.apache.ibatis.annotations.Select; import org.apache.ibatis.annotations.Update; import com.dx.test.dao.sqlprovider.LogSqlProvider; import com.dx.test.model.Log; import com.dx.test.model.enums.ModuleType; import com.dx.test.model.enums.OperateType; @Mapper public interface LogMapper { /** * 入库日志 * * @param log 待入库实体 * @return 影响条数 */ @Options(useCache = true, flushCache = Options.FlushCachePolicy.TRUE, useGeneratedKeys = true, keyProperty = "id", keyColumn = "id") @InsertProvider(type = LogSqlProvider.class, method = "insert") public int insert(Log log); /** * 根据文章id,查询日志详情 * * @param id 日志id * @return 返回查询到的日志详情 */ @Options(useCache = true, flushCache = Options.FlushCachePolicy.FALSE, timeout = 60000) @Results(id = "logResult", value = { @Result(property = "id", column = "id", id = true), @Result(property = "title", column = "title"), @Result(property = "content", column = "content"), @Result(property = "moduleType", column = "module_type", javaType = ModuleType.class), @Result(property = "operateType", column = "operate_type", javaType = OperateType.class), @Result(property = "dataId", column = "data_id"), @Result(property = "createUser", column = "create_user"), @Result(property = "createUserId", column = "create_user_id"), @Result(property = "createTime", column = "create_time") }) @Select({ "select * from `log` where `id`=#{id}" }) Log getById(@Param("id") Long id); @Options(useCache = true, flushCache = Options.FlushCachePolicy.FALSE, timeout = 60000) @ResultMap("logResult") @Select(value={ "<script>", "select * from `log` " , "<where>" , " <if test=\\"title!=null and title!=\'\'\\">" , " and `title` like CONCAT(\'%\', #{title}, \'%\') " , " </if>" , " <if test=\\"moduleType!=null \\">" , " and `module_type`=#{moduleType} " , " </if>" , " <if test=\\"operateType!=null \\">" , " and `operate_type`=#{operateType} " , " </if>" , " </where>", "</script>" }) List<Log> getByPojo(Log log); @Options(useCache = true, flushCache = Options.FlushCachePolicy.FALSE, timeout = 60000) @ResultMap("logResult") @Select(value={ "<script>", "select * from `log` " , "<where>" , " <if test=\\"title!=null and title!=\'\'\\">" , " and `title` like CONCAT(\'%\', #{title}, \'%\') " , " </if>" , " <if test=\\"moduleType!=null \\">" , " and `module_type`=#{moduleType} " , " </if>" , " <if test=\\"operateType!=null \\">" , " and `operate_type`=#{operateType} " , " </if>" , " </where>", "</script>" }) List<Log> getByParameter(@Param("title") String title,@Param("moduleType") ModuleType moduleType,@Param("operateType") OperateType operateType); @Options(useCache = true, flushCache = Options.FlushCachePolicy.FALSE, timeout = 60000) @ResultMap("logResult") @Select(value={ "<script>", "select * from `log` " , "<where>" , " <if test=\\"title!=null and title!=\'\'\\">" , " and `title` like CONCAT(\'%\', #{title}, \'%\') " , " </if>" , " <if test=\\"moduleType!=null \\">" , " and `module_type`=#{moduleType} " , " </if>" , " <if test=\\"operateType!=null \\">" , " and `operate_type`=#{operateType} " , " </if>" , " </where>", "</script>" }) List<Log> getByMap(Map<String, Object> map); @Options(useCache = true, flushCache = Options.FlushCachePolicy.FALSE, timeout = 60000) @ResultMap("logResult") @Select({ "<script>", "select * from `log` " , "<where>" , " <choose> ", " <when test=\\"dataId!=null\\">", " and data_id=#{dataId}", " </when>", " <when test=\\"id!=null\\">", " and id=#{id}", " </when>", " <otherwise>", " and 1=1", " </otherwise>", " </choose>", "</where>" , "</script>"}) List<Log> getList(final Log log); @Options(useCache = true, flushCache = Options.FlushCachePolicy.TRUE) @Update({ "<script>", "update `log` " , "<set>" , " <if test=\\"dataId!=null\\">", " `data_id`=#{dataId},", " </if>", " <if test=\\"title!=null\\">", " `title`=#{title},", " </if>", " <if test=\\"content!=null\\">", " `content`=#{content} ", " </if>", "</set>" , " where id=#{id}", "</script>"}) int update(final Log log); @Options(useCache = true, flushCache = Options.FlushCachePolicy.FALSE, timeout = 60000) @ResultMap("logResult") @Select({ "select * from `log` where `id`<#{log.id}" }) List<Log> getListWithPager(@Param("log")Log log,@Param("pageNum") int pageNum,@Param("pageSize") int pageSize); }
LogSqlProvider.java（LogMapper中使用sql代理类）
public class LogSqlProvider { /** * 生成插入日志SQL * @param log 日志实体 * @return 插入日志SQL * */ public String insert(Log log) { return new SQL() { { INSERT_INTO("log"); INTO_COLUMNS("title", "module_type", "operate_type","data_id", "content", "create_time","create_user","create_user_id"); INTO_VALUES("#{title}", "#{moduleType,typeHandler=org.apache.ibatis.type.EnumOrdinalTypeHandler}", "#{operateType,typeHandler=org.apache.ibatis.type.EnumOrdinalTypeHandler}","#{dataId}", "#{content}", "now()","#{createUser}","#{createUserId}"); } }.toString(); } }
ModuleType.java(enum)
package com.dx.test.model.enums; public enum ModuleType { Unkown(0), /** * 文章模块 */ Article_Module(1), /** * 文章分类模块 **/ Article_Category_Module(2), /** * 配置模块 */ Settings_Module(3); private int value; ModuleType(int value) { this.value = value; } public int getValue() { return this.value; } }
OperateType.java(enum)
package com.dx.test.model.enums; public enum OperateType { /** * 如果0未占位，可能会出现错误。 * */ Unkown(0), /** * 新增 */ Create(1), /** * 修改 */ Modify(2), /** * 删除 */ Delete(3), /** * 查看 */ View(4), /** * 作废 */ UnUsed(5); private int value; OperateType(int value) { this.value = value; } public int getValue() { return this.value; } }
Log.java(实体类)
package com.dx.test.model; import java.util.Date; import com.dx.test.model.enums.ModuleType; import com.dx.test.model.enums.OperateType; public class Log { private Long id; // 自增id private String title;// 日志msg private ModuleType moduleType;// 日志归属模块 private OperateType operateType; // 日志操作类型 private String dataId; // 操作数据id private String content; // 日志内容简介 private Date createTime; // 新增时间 private String createUser; // 新增人 private String createUserId; // 新增人id public Long getId() { return id; } public void setId(Long id) { this.id = id; } public String getTitle() { return title; } public void setTitle(String title) { this.title = title; } public ModuleType getModuleType() { return moduleType; } public void setModuleType(ModuleType moduleType) { this.moduleType = moduleType; } public OperateType getOperateType() { return operateType; } public void setOperateType(OperateType operateType) { this.operateType = operateType; } public String getDataId() { return dataId; } public void setDataId(String dataId) { this.dataId = dataId; } public String getContent() { return content; } public void setContent(String content) { this.content = content; } public Date getCreateTime() { return createTime; } public void setCreateTime(Date createTime) { this.createTime = createTime; } public String getCreateUser() { return createUser; } public void setCreateUser(String createUser) { this.createUser = createUser; } public String getCreateUserId() { return createUserId; } public void setCreateUserId(String createUserId) { this.createUserId = createUserId; } @Override public String toString() { return "Log [id=" + id + ", title=" + title + ", moduleType=" + moduleType + ", operateType=" + operateType + ", dataId=" + dataId + ", content=" + content + ", createTime=" + createTime + ", createUser=" + createUser + ", createUserId=" + createUserId + "]"; } }
MybatisTest.java(测试入口类)
package com.dx.test; import java.util.Date; import java.util.HashMap; import java.util.List; import java.util.Map; import java.io.IOException; import java.io.InputStream; import org.apache.ibatis.io.Resources; import org.apache.ibatis.session.SqlSession; import org.apache.ibatis.session.SqlSessionFactory; import org.apache.ibatis.session.SqlSessionFactoryBuilder; import com.dx.test.dao.LogMapper; import com.dx.test.model.Log; import com.dx.test.model.enums.ModuleType; import com.dx.test.model.enums.OperateType; public class MybatisTest { public static void main(String[] args) { InputStream config = null; try { config = Resources.getResourceAsStream("mybatis-config.xml"); } catch (IOException e) { e.printStackTrace(); throw new RuntimeException(e); } SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(config); SqlSession sqlSession = sqlSessionFactory.openSession(); LogMapper logMapper = sqlSession.getMapper(LogMapper.class); // choose： Log queryLog= new Log(); queryLog.setDataId("1"); List<Log> logByDataIdList=logMapper.getList(queryLog); for (Log item : logByDataIdList) { System.out.println(item); } System.out.println("=========================================================="); String[] titleList = new String[] { "test", "test2", "awr", "a", "c", "tes", "ll", "gg", "dd", "22" }; ModuleType[] moduleTypes = new ModuleType[] { ModuleType.Article_Category_Module, ModuleType.Article_Module,ModuleType.Settings_Module }; OperateType[] operateTypes = new OperateType[] { OperateType.Create, OperateType.Delete, OperateType.Modify,OperateType.Modify, OperateType.UnUsed }; for (int i = 0; i < 10; i++) { Log waitingInsertLog = new Log(); waitingInsertLog.setTitle("log " + titleList[i]); waitingInsertLog.setContent("test content" + titleList[i]); waitingInsertLog.setCreateTime(new Date());以上是关于MyBatis：Mybatis 参数传递用法的主要内容，如果未能解决你的问题，请参考以下文章