Datastore Example 1
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Datastore Example showing setup
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For detailed documentation that includes this code sample, see the following:
Code sample
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[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],[],[[["\u003cp\u003eThis content provides a Go code sample demonstrating how to interact with Datastore, specifically showcasing a test scenario with insufficient funds.\u003c/p\u003e\n"],["\u003cp\u003eIt includes instructions on how to set up authentication for Datastore mode using Application Default Credentials, which is essential for local development.\u003c/p\u003e\n"],["\u003cp\u003eThe page also points to relevant documentation for local unit testing in both Go and Python 2, offering resources for comprehensive testing.\u003c/p\u003e\n"],["\u003cp\u003eUsers can find additional code samples for Datastore and other Google Cloud products through the provided Google Cloud sample browser link.\u003c/p\u003e\n"],["\u003cp\u003eThe user is referred to resources for understanding how to use the client library for Datastore mode, as well as a link to the Datastore mode Go API reference documentation.\u003c/p\u003e\n"]]],[],null,["# Datastore Example 1\n\nDatastore Example showing setup\n\nExplore further\n---------------\n\n\nFor detailed documentation that includes this code sample, see the following:\n\n- [Local Unit Testing for Go](/appengine/docs/legacy/standard/go111/tools/localunittesting)\n- [Local Unit Testing for Python 2](/appengine/docs/legacy/standard/python/tools/localunittesting)\n\nCode sample\n-----------\n\n### Go\n\n\nTo learn how to install and use the client library for Datastore mode, see\n[Datastore mode client libraries](/datastore/docs/reference/libraries).\n\n\nFor more information, see the\n[Datastore mode Go API\nreference documentation](https://cloud.google.com/go/docs/reference/cloud.google.com/go/datastore/latest).\n\n\nTo authenticate to Datastore mode, set up Application Default Credentials.\nFor more information, see\n\n[Set up authentication for a local development environment](/docs/authentication/set-up-adc-local-dev-environment).\n\n func TestWithdrawLowBal(t *testing.T) {\n \tctx, done, err := aetest.NewContext()\n \tif err != nil {\n \t\tt.Fatal(err)\n \t}\n \tdefer done()\n \tkey := datastore.NewKey(ctx, \"BankAccount\", \"\", 1, nil)\n \tif _, err := datastore.Put(ctx, key, &BankAccount{100}); err != nil {\n \t\tt.Fatal(err)\n \t}\n\n \terr = withdraw(ctx, \"myid\", 128, 0)\n \tif err == nil || err.Error() != \"insufficient funds\" {\n \t\tt.Errorf(\"Error: %v; want insufficient funds error\", err)\n \t}\n\n \tb := BankAccount{}\n \tif err := datastore.Get(ctx, key, &b); err != nil {\n \t\tt.Fatal(err)\n \t}\n \tif bal, want := b.Balance, 100; bal != want {\n \t\tt.Errorf(\"Balance %d, want %d\", bal, want)\n \t}\n }\n\nWhat's next\n-----------\n\n\nTo search and filter code samples for other Google Cloud products, see the\n[Google Cloud sample browser](/docs/samples?product=datastore)."]]
