TableStore：单行操作

首先需要添加TableStore的依赖

<dependency>
    <groupId>com.aliyun.openservices</groupId>
    <artifactId>tablestore</artifactId>
    <version>4.10.2</version>
</dependency>

运行项目时可能会出现SLF4J相关的红字提示：

该提示不影响使用，如果觉得不爽的话，可以添加下面依赖去除：

<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-simple</artifactId>
    <version>1.7.26</version>
</dependency>

1、根据主键查询数据（主键只有一个）

package com.example.demo;

import com.alicloud.openservices.tablestore.SyncClient;
import com.alicloud.openservices.tablestore.model.Column;
import com.alicloud.openservices.tablestore.model.GetRowRequest;
import com.alicloud.openservices.tablestore.model.GetRowResponse;
import com.alicloud.openservices.tablestore.model.PrimaryKey;
import com.alicloud.openservices.tablestore.model.PrimaryKeyBuilder;
import com.alicloud.openservices.tablestore.model.PrimaryKeyValue;
import com.alicloud.openservices.tablestore.model.Row;
import com.alicloud.openservices.tablestore.model.SingleRowQueryCriteria;

public class Query {

    public static void main(String[] args) {

        final String endPoint = "实例访问地址";
        final String accessKeyId = "accessKeyId";
        final String accessKeySecret = "accessKeySecret";
        // 实例名
        final String instanceName = "owlforest";

        SyncClient client = new SyncClient(endPoint, accessKeyId, accessKeySecret, instanceName);

        // 构造主键
        PrimaryKeyBuilder primaryKeyBuilder = PrimaryKeyBuilder.createPrimaryKeyBuilder();
        primaryKeyBuilder.addPrimaryKeyColumn("noteid", PrimaryKeyValue.fromLong(1));
        PrimaryKey primaryKey = primaryKeyBuilder.build();

        SingleRowQueryCriteria criteria = new SingleRowQueryCriteria("note", primaryKey);

        // 设置读取最新版本
        criteria.setMaxVersions(1);
        // 读取所有数据
        GetRowResponse getRowResponse = client.getRow(new GetRowRequest(criteria));
        Row row = getRowResponse.getRow();
        // 遍历所有列
        Column[] columns = row.getColumns();
        for (Column column : columns) {
            System.out.println("Name:" + column.getName() + " Value:" + column.getValue());
        }
    }

}

如果只需要读取指定列，可以这样设置：

// 设置读取某些列
String[] a = { "author" };
criteria.addColumnsToGet(a);
GetRowResponse getRowResponse2 = client.getRow(new GetRowRequest(criteria));
Row row2 = getRowResponse2.getRow();
Column[] columns2 = row2.getColumns();
for (Column column : columns2) {
    System.out.println("Name:" + column.getName() + " Value:" + column.getValue());
}

经测试，criteria.addColumnsToGet("author");这么设置运行也不会报错，不过仍然会读出所有属性。