使用 IN 子句參數化 DocumentDB 查詢

Question

我有一個有點像我試圖參數化的查詢：

List<string> poiIDs = /*List of poi ids*/;
List<string> parameterNames = /*List of parameter names*/;

string inClause = string.Join(",", parameterNames);

string query = string.Format("SELECT c.id AS poiID, c.poiName, c.latitude, c.longitude FROM c WHERE c.clusterName = @clusterName AND c.id IN ({0}) AND c.deleted = false", inClause);

IQueryable<POI> queryResult = Client.CreateDocumentQuery<POI>(Collection.SelfLink, new SqlQuerySpec
            {
                QueryText = query,
                Parameters = new SqlParameterCollection()
                {
                    new SqlParameter("@clusterName", "POI"),
                    // How do I declare the dynamically generated parameters here
                    // as new SqlParameter()?
                }
             });

如何將動態生成的參數聲明為 SqlQuerySpec 的 Parameters 屬性的 new SqlParameter() 以創建我的文檔查詢？

Answer 1

您可以像這樣創建動態參數化查詢：

// DocumentDB query 
 // POINT TO PONDER: create the formatted query, so that after creating the   dynamic query we'll replace it with dynamically created "SQL Parameter/s"
            var queryText = @"SELECT
                                us.id,
                                us.email,           
                                us.status,
                                us.role
                            FROM user us
                            WHERE us.status = @userStatus AND us.email IN ({0})";


            // contain's list of emails  
            IList<string> emailIds = new List<string>();
            emailIds.Add("a@gmail.com");
            emailIds.Add("b@gmail.com");

            #region Prepare the query

            // simple parameter: e.g. check the user status
            var userStatus = "active";
            var sqlParameterCollection = new SqlParameterCollection { new SqlParameter("@userStatus", userStatus) };                

            // IN clause: with list of parameters:
            // first: use a list (or array) of string, to keep  the names of parameter          
            // second: loop through the list of input parameters ()
            var namedParameters = new List<string>();
            var loopIndex = 0;

            foreach (var email in emailIds)
            {
                var paramName = "@namedParam_" + loopIndex;
                namedParameters.Add(paramName);

                var newSqlParamter = new SqlParameter(paramName, email);
                sqlParameterCollection.Add(newSqlParamter);

                loopIndex++;
            }

            // now format the query, pass the list of parameter into that
            if (namedParameters.Count > 0)
                queryText = string.Format(queryText, string.Join(" , ", namedParameters));

                // after this step your query is something like this  
                // SELECT
                //                 us.id,
                //                 us.email,            
                //                 us.status,
                //                 us.role
                //             FROM user us
                //             WHERE us.status = @userStatus AND us.email IN (@namedParam_0, @namedParam_1, @namedParam_2)

            #endregion //Prepare the query

            // now inject the parameter collection object & query
            var users = Client.CreateDocumentQuery<Users>(CollectionUri, new SqlQuerySpec
            {
                QueryText = queryText,
                Parameters = sqlParameterCollection
            }).ToList();

Answer 2

以下為您提供了一個 SQL 查詢，然后您可以在您的 DocumentDB 集合中運行，以通過其 ID 獲取文檔。

var query = $"SELECT * FROM p WHERE p.id IN ('{string.Join("', '", arrayOfIds)}')";

Answer 3

DocumentDB SDK 不支持參數化IN查詢。

從上面評論中的SO 線程來看，SQL 也沒有。 如另一個線程中所述，您可以使用 LINQ 作為解決方法。

Answer 4

為什么不使用 ArrayContains 方法？ 這是節點中的一個例子

sqlQuery = {
        query: 'SELECT * FROM t WHERE ARRAY_CONTAINS(@idList, t.id)',
        parameters: [
            {
                name: '@idList',
                value: ['id1','id2','id3'],
            },
        ],
    };