Select Snippet in Java in Java

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Select Snippet in Java
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This code prints out a single page of select results in Java:
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SimpleDB simpleDB = new SimpleDB(accessKeyID, secretAccessKey); try { Domain domain = simpleDBgetDomain("users"); printSelectResults(domainselectItems("SELECT * FROM users", null)); } catch (SDBException e) {
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AWSError error = egetErrors()get(0); String code = errorgetCode(); String message = errorgetMessage(); Systemerrprintf("select failed: %s: %s", code, message); } private void printSelectResults(QueryWithAttributesResult result) { for (String itemName : resultgetItems()keySet()) { Systemoutprintln(itemName); for (ItemAttribute attr : resultgetItems()get(itemName)) { Systemoutprintln("\t" + attrgetValue()); } } }
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The sample code defines the SelectExpression, makes the call to Select, and prints the results all in the same lineThe null parameter after SelectExpression in the call to selectItems() is the only other valid Select parameter: NextToken It is null here since this is an initial queryThe printSelectResults() method iterates through the map keys, which are returned by TypicaThis map is in the same format that batchPutAttributes() required in the previous Java snippet Each key is an ItemName and maps to an ItemAttribute listThe map could be empty if no items matched the SelectExpression query The prior example used a simple queryThe following example shows how to fetch multiple pages of select results using NextToken and uses a much more specific query:
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String select = "SELECT Rating, Make, Supplier" + " FROM products" + " WHERE Rating > '85'" + " AND ProductType = 'Cigar'" + " ORDER BY Rating DESC" + " LIMIT 2"; SimpleDB simpleDB = new SimpleDB(accessKeyID, secretAccessKey); try { Domain domain = simpleDBgetDomain("products"); String nextToken = null; QueryWithAttributesResult results = null; do { results = domainselectItems(select, nextToken); printSelectResults(results); nextToken = resultsgetNextToken(); } while (nextToken != null); } catch (SDBException e) { AWSError error = egetErrors()get(0);
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String code = errorgetCode(); String message = errorgetMessage(); Systemerrprintf("select failed: %s: %s", code, message); }
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In looking at the query, notice that there are only three specific attributes being requestedThis query matches up with the data stored in the prior BatchPutAttributes code sample Four items were stored in the products domainThis query only requests the items with a rating greater than 85 and only two at a time Because three of the four items meet these criteria and the limit per page is two, the first Select will come back with two items and a NextToken allowing retrieval of the final match A loop is used when calling selectItems() to handle an unknown number of pages The result is printed for each iteration, and the fresh NextToken is attached to the requestThe existing request is reused with the same SelectExpression still attached When no token comes back, the loop falls through Also, notice that the query calls for results to be sorted by rating, from high to low When you run this sample code, look to see that all the ratings are greater than 85 and that they are sorted
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Select Snippet in C#
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This is the C# version of the single-page query code:
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AmazonSimpleDB simpleDB = new AmazonSimpleDBClient(id, secret); SelectRequest request = new SelectRequest(); try { requestSelectExpression = "SELECT * FROM users"; printSelectResults(simpleDBSelect(request)SelectResult); } catch (AmazonSimpleDBException ex) { String code = exErrorCode; String message = exMessage; ConsoleWriteLine("select failed: {0}: {1}", code, message); } private void printSelectResults(SelectResult result) { foreach (Item item in resultItem) { ConsoleWriteLine(itemName); foreach (Attr attr in itemAttribute) { ConsoleWriteLine("\t{0}", attrValue); } }
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Each item returned from a single request is printed out in turnThe code for handling multiple pages is shown here:
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String select = "SELECT Rating, Make, Supplier" + " FROM products" + " WHERE Rating > '85'" + " AND ProductType = 'Cigar'" + " ORDER BY Rating DESC" + " LIMIT 2"; AmazonSimpleDB simpleDB = new AmazonSimpleDBClient(id, secret); SelectRequest request = new SelectRequest(); try { requestSelectExpression = select; SelectResult result = null; do { result = simpleDBSelect(request)SelectResult; printSelectResults(result); requestNextToken = resultNextToken; } while (resultIsSetNextToken()); } catch (AmazonSimpleDBException ex) { String code = exErrorCode; String message = exMessage; ConsoleWriteLine("select failed: {0}: {1}", code, message); }
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Notice that this query is only requesting three specific attributesThis query matches up with the data stored in the BatchPutAttributes code sampleWith this query, only the items with a rating greater than 85 are requested and a limit of two items is specified Because only three of the four items meet these criteria, the first select will contain two items, and a NextToken and a second call, which includes that token, will contain the final item A loop is used when calling Select() to handle an unknown number of pages During each loop, results are printed, and the NextToken is attached to the existing request The existing request is reused since it is still configured with the same SelectExpressionWhen no token is returned in the response, the loop falls through Also, notice that the SelectExpression value calls for results to be sorted by rating, from high to lowWhen you run this sample code, look to see that all the ratings are greater than 85 and that they are sorted
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