Dataflow read api
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Use the Dataflow connector to read from a database without using a query by specifying a table name and a list of columns.
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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"]],[],[],[],null,["# Dataflow read api\n\nUse the Dataflow connector to read from a database without using a query by specifying a table name and a list of columns.\n\nExplore further\n---------------\n\n\nFor detailed documentation that includes this code sample, see the following:\n\n- [Import, export, and modify data using Dataflow](/spanner/docs/dataflow-connector)\n\nCode sample\n-----------\n\n### Java\n\n\nTo learn how to install and use the client library for Spanner, see\n[Spanner client libraries](/spanner/docs/reference/libraries).\n\n\nTo authenticate to Spanner, 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 // Query for all the columns and rows in the specified Spanner table\n PCollection\u003cStruct\u003e records = pipeline.apply(\n SpannerIO.read()\n .withInstanceId(instanceId)\n .withDatabaseId(databaseId)\n .withTable(\"Singers\")\n .withColumns(\"singerId\", \"firstName\", \"lastName\"));\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=spanner)."]]
