DsHint(指定数据源)和BatchSizeHint(指定批次数量)

概述和使用场景

  • DsHintApi ,强制指定数据源,
  • BatchSizeHintApi ,强制指定查询批量数量

API定义

DsHintApi

    public static DsHintApi model(String model/**模型编码*/) {
     // 具体实现
    }

    public DsHintApi(Object dsKey/***数据源名称*/) {
         // 具体实现
    }

BatchSizeHintApi

   public static BatchSizeHintApi use(Integer batchSize) {
     // 具体实现
    }

使用示例

  • 1、【注意】代码中使用 try-with-resources语法; 否则可能会出现数据源错乱

  • 2、DsHintApi使用示例
    包裹在try里面的所有查询都会强制使用指定的数据源

    // 使用方式1:
    try (DsHintApi dsHintApi = DsHintApi.model(PetItem.MODEL_MODEL)) {
       List<PetItem> items = demoItemDAO.customSqlDemoItem();
       PetShopProxy data2 = data.queryById();
       data2.fieldQuery(PetShopProxy::getPetTalents);
    }
    
    // 使用方式2:
    try (DsHintApi dsHintApi = DsHintApi.use("数据源名称")) {
        List<PetItem> items = demoItemDAO.customSqlDemoItem();
        PetShopProxy data2 = data.queryById();
        data2.fieldQuery(PetShopProxy::getPetTalents);
    }
  • 3、BatchSizeHintApi使用示例
    包裹在try里面的所有查询都会按照指定的batchSize进行查询

    // 查询指定每次查询500跳
    try (BatchSizeHintApi batchSizeHintApi = BatchSizeHintApi.use(500)) {
       PetShopProxy data2 = data.queryById();
       data2.fieldQuery(PetShopProxy::getPetTalents);
    }
//  查询指定不分页(batchSize=-1)查询。 请注意,你必须在明确不需要分页查询的情况下使用;如果数据量超大不分页可能会卡死。默认不指定分页数的情况下下平台会进行分页查询
 try (BatchSizeHintApi batchSizeHintApi = BatchSizeHintApi.use(-1)) {
       PetShopProxy data2 = data.queryById();
       data2.fieldQuery(PetShopProxy::getPetTalents);
 }

Oinone社区 作者:望闲原创文章,如若转载,请注明出处:https://doc.oinone.top/backend/7376.html

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