使用 IN 子句参数化 DocumentDB 查询

Question

I have a query somewhat like the following which I'm trying to parameterize:

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()?
                }
             });

How do I declare the dynamically generated parameters as new SqlParameter() for the Parameters property of SqlQuerySpec in order to create my document query?

Answer 1

You can create dynamic parameterized query like this:

// 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

以下为您提供了一个 SQL 查询，然后您可以在您的 DocumentDB 集合中运行，以通过其 ID 获取文档。

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

Answer 3

The DocumentDB SDK doesn't support parameterized IN queries.

Judging from the SO thread in the comment above, SQL does not either. As mentioned in the other thread, you can use LINQ as a workaround.

Answer 4

Why not use the ArrayContains method? Here is an example in node

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