使用mybatis-plus來進行批量新增和更新時，你會發現其實是一條條sql執行,下面進行優化。
1.添加InsertBatchMethod和UpdateBatchMethod類
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import com.baomidou.mybatisplus.core.injector.AbstractMethod;import com.baomidou.mybatisplus.core.metadata.TableInfo;import lombok.extern.slf4j.Slf4j;import org.apache.ibatis.executor.keygen.NoKeyGenerator;import org.apache.ibatis.mapping.MappedStatement;import org.apache.ibatis.mapping.SqlSource; /** * 批量插入方法實現 */@Slf4jpublic class InsertBatchMethod extends AbstractMethod { @Override public MappedStatement injectMappedStatement(Class<?> mapperClass, Class<?> modelClass, TableInfo tableInfo) { final String sql = "<script>insert into %s %s values %s</script>"; final String fieldSql = prepareFieldSql(tableInfo); final String valueSql = prepareValuesSql(tableInfo); final String sqlResult = String.format(sql, tableInfo.getTableName(), fieldSql, valueSql); //log.debug("sqlResult----->{}", sqlResult); SqlSource sqlSource = languageDriver.createSqlSource(configuration, sqlResult, modelClass); return this.addInsertMappedStatement(mapperClass, modelClass, "insertBatch", sqlSource, new NoKeyGenerator(), null, null); } private String prepareFieldSql(TableInfo tableInfo) { StringBuilder fieldSql = new StringBuilder(); fieldSql.append(tableInfo.getKeyColumn()).append(","); tableInfo.getFieldList().forEach(x -> fieldSql.append(x.getColumn()).append(",")); fieldSql.delete(fieldSql.length() - 1, fieldSql.length()); fieldSql.insert(0, "("); fieldSql.append(")"); return fieldSql.toString(); } private String prepareValuesSql(TableInfo tableInfo) { final StringBuilder valueSql = new StringBuilder(); valueSql.append("<foreach collection=\"list\" item=\"item\" index=\"index\" open=\"(\" separator=\"),(\" close=\")\">"); valueSql.append("#{item.").append(tableInfo.getKeyProperty()).append("},"); tableInfo.getFieldList().forEach(x -> valueSql.append("#{item.").append(x.getProperty()).append("},")); valueSql.delete(valueSql.length() - 1, valueSql.length()); valueSql.append("</foreach>"); return valueSql.toString(); }} |
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import com.baomidou.mybatisplus.core.injector.AbstractMethod;import com.baomidou.mybatisplus.core.metadata.TableInfo;import lombok.extern.slf4j.Slf4j;import org.apache.ibatis.mapping.MappedStatement;import org.apache.ibatis.mapping.SqlSource; /** * 批量更新方法實現，條件為主鍵，選擇性更新 */@Slf4jpublic class UpdateBatchMethod extends AbstractMethod { @Override public MappedStatement injectMappedStatement(Class<?> mapperClass, Class<?> modelClass, TableInfo tableInfo) { String sql = "<script>\n<foreach collection=\"list\" item=\"item\" separator=\";\">\nupdate %s %s where %s=#{%s} %s\n</foreach>\n</script>"; String additional = tableInfo.isWithVersion() ? tableInfo.getVersionFieldInfo().getVersionOli("item", "item.") : "" + tableInfo.getLogicDeleteSql(true, true); String setSql = sqlSet(tableInfo.isWithLogicDelete(), false, tableInfo, false, "item", "item."); String sqlResult = String.format(sql, tableInfo.getTableName(), setSql, tableInfo.getKeyColumn(), "item." + tableInfo.getKeyProperty(), additional); //log.debug("sqlResult----->{}", sqlResult); SqlSource sqlSource = languageDriver.createSqlSource(configuration, sqlResult, modelClass); // 第三個參數必須和RootMapper的自定義方法名一致 return this.addUpdateMappedStatement(mapperClass, modelClass, "updateBatch", sqlSource); } } |
2.添加自定義方法SQL注入器
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import com.baomidou.mybatisplus.core.injector.AbstractMethod;import com.baomidou.mybatisplus.core.injector.DefaultSqlInjector; import java.util.List; public class CustomizedSqlInjector extends DefaultSqlInjector { /** * 如果只需增加方法，保留mybatis plus自帶方法， * 可以先獲取super.getMethodList()，再添加add */ @Override public List<AbstractMethod> getMethodList(Class<?> mapperClass) { List<AbstractMethod> methodList = super.getMethodList(mapperClass); methodList.add(new InsertBatchMethod()); methodList.add(new UpdateBatchMethod()); return methodList; }} |
3.注入配置
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@MapperScan("com.xxx.mapper")@Configurationpublic class MyBatisPlusConfig { @Bean public CustomizedSqlInjector customizedSqlInjector() { return new CustomizedSqlInjector(); }} |
4.添加通用mapper
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import com.baomidou.mybatisplus.core.mapper.BaseMapper;import org.apache.ibatis.annotations.Param; import java.util.List; /** * 根Mapper，給表Mapper繼承用的，可以自定義通用方法 * {@link com.baomidou.mybatisplus.core.mapper.BaseMapper} * {@link com.baomidou.mybatisplus.extension.service.IService} * {@link com.baomidou.mybatisplus.extension.service.impl.ServiceImpl} */public interface RootMapper<T> extends BaseMapper<T> { /** * 自定義批量插入 * 如果要自動填充，@Param(xx) xx參數名必須是 list/collection/array 3個的其中之一 */ int insertBatch(@Param("list") List<T> list); /** * 自定義批量更新，條件為主鍵 * 如果要自動填充，@Param(xx) xx參數名必須是 list/collection/array 3個的其中之一 */ int updateBatch(@Param("list") List<T> list);} |
5.如何使用
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@Repositorypublic interface UserInfoMapper extends RootMapper<UserInfo> {} public interface UserInfoService extends IService<UserInfo> { int saveAll(); int updateAll();} @Servicepublic class UserInfoServiceImpl extends ServiceImpl<UserInfoMapper, UserInfo> implements UserInfoService{ @Override public int saveAll() { List<UserInfo> list = new ArrayList<>(); for (int i = 0; i < 20; i++) { UserInfo userInfo = new UserInfo(); userInfo.setUserName("厲害" + i); userInfo.setSalt(RandomStringUtils.randomAlphabetic(6)); userInfo.setPassword(SecureUtil.sha256("123456" + userInfo.getSalt())); userInfo.setSex(0); userInfo.setAvatar(LoginServiceImpl.AVATAR); list.add(userInfo); } return baseMapper.insertBatch(list); } @Override public int updateAll() { List<UserInfo> userInfos = baseMapper.selectList(Wrappers.<UserInfo>lambdaQuery().between(BaseEntity::getId, 43, 62)); userInfos.forEach(userInfo -> { userInfo.setUserName("更新了" + IdUtil.simpleUUID()); }); return baseMapper.updateBatch(userInfos); }} |
到此這篇關于mybatisplus添加真正的批量新增、批量更新的實現的文章就介紹到這了,更多相關mybatisplus批量新增、批量更新內容請搜索服務器之家以前的文章或繼續瀏覽下面的相關文章希望大家以后多多支持服務器之家！
原文鏈接：https://blog.csdn.net/qq_18432653/article/details/110875608
