使用mybatis-plus來(lái)進(jìn)行批量新增和更新時(shí)，你會(huì)發(fā)現(xiàn)其實(shí)是一條條sql執(zhí)行,下面進(jìn)行優(yōu)化。
1.添加InsertBatchMethod和UpdateBatchMethod類(lèi)
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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(shí)現(xiàn) */@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(shí)現(xiàn)，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(gè)參數(shù)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(dòng)填充，@Param(xx) xx參數(shù)名必須是 list/collection/array 3個(gè)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(dòng)填充，@Param(xx) xx參數(shù)名必須是 list/collection/array 3個(gè)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(guān)于mybatisplus添加真正的批量新增、批量更新的實(shí)現(xiàn)的文章就介紹到這了,更多相關(guān)mybatisplus批量新增、批量更新內(nèi)容請(qǐng)搜索服務(wù)器之家以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持服務(wù)器之家！
原文鏈接：https://blog.csdn.net/qq_18432653/article/details/110875608
