Update graph data with DML
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Update data in a Spanner Graph using DML.
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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,["# Update graph data with DML\n\nUpdate data in a Spanner Graph using DML.\n\nExplore further\n---------------\n\n\nFor detailed documentation that includes this code sample, see the following:\n\n- [Insert, update, or delete Spanner Graph data](/spanner/docs/graph/insert-update-delete-data)\n\nCode sample\n-----------\n\n### C++\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 void UpdateDataWithDml(google::cloud::spanner::Client client) {\n using ::google::cloud::StatusOr;\n namespace spanner = ::google::cloud::spanner;\n\n auto commit_result = client.Commit(\n [&client](spanner::Transaction txn) -\u003e StatusOr\u003cspanner::Mutations\u003e {\n auto update = client.ExecuteDml(\n std::move(txn),\n spanner::SqlStatement(\n \"UPDATE Account SET is_blocked = false WHERE id = 2\"));\n if (!update) return std::move(update).status();\n return spanner::Mutations{};\n });\n if (!commit_result) throw std::move(commit_result).status();\n\n commit_result = client.Commit(\n [&client](spanner::Transaction txn) -\u003e StatusOr\u003cspanner::Mutations\u003e {\n auto update =\n client.ExecuteDml(std::move(txn), spanner::SqlStatement(R\"\"\"(\n UPDATE AccountTransferAccount\n SET amount = 300 WHERE id = 1 AND to_id = 2)\"\"\"));\n if (!update) return std::move(update).status();\n return spanner::Mutations{};\n });\n if (!commit_result) throw std::move(commit_result).status();\n\n std::cout \u003c\u003c \"Update was successful [spanner_update_graph_data_with_dml]\\n\";\n }\n\n### Go\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\n import (\n \t\"context\"\n \t\"fmt\"\n \t\"io\"\n\n \t\"cloud.google.com/go/spanner\"\n )\n\n func updateGraphDataWithDml(w io.Writer, db string) error {\n \tctx := context.Background()\n \tclient, err := spanner.NewClient(ctx, db)\n \tif err != nil {\n \t\treturn err\n \t}\n \tdefer client.Close()\n\n \t// Execute a ReadWriteTransaction to update the 'Account' table underpinning\n \t// 'Account' nodes in 'FinGraph'. The function run by ReadWriteTransaction\n \t// executes an 'UPDATE' SQL DML statement. Graph queries run after this\n \t// transaction is committed will observe the effects of the update to 'Account'\n \t// with 'id' = 2.\n \t_, err1 := client.ReadWriteTransaction(ctx, func(ctx context.Context, txn *spanner.ReadWriteTransaction) error {\n \t\tstmt := spanner.https://cloud.google.com/go/docs/reference/cloud.google.com/go/spanner/latest/index.html#cloud_google_com_go_spanner_Statement{\n \t\t\tSQL: `UPDATE Account SET is_blocked = false WHERE id = 2`,\n \t\t}\n \t\trowCount, err := txn.Update(ctx, stmt)\n \t\tif err != nil {\n \t\t\treturn err\n \t\t}\n \t\tfmt.Fprintf(w, \"%d Account record(s) updated.\\n\", rowCount)\n \t\treturn err\n \t})\n\n \tif err1 != nil {\n \t\treturn err1\n \t}\n\n \t// Execute a ReadWriteTransaction to update the 'AccountTransferAccount' table\n \t// underpinning 'AccountTransferAccount' edges in 'FinGraph'. The function run\n \t// by ReadWriteTransaction executes an 'UPDATE' SQL DML statement.\n \t// Graph queries run after this transaction is committed will observe the effects\n \t// of the update to 'AccountTransferAccount' where the source of the transfer has\n \t// 'id' 1 and the destination has 'id' 2.\n \t_, err2 := client.ReadWriteTransaction(ctx, func(ctx context.Context, txn *spanner.ReadWriteTransaction) error {\n \t\tstmt := spanner.https://cloud.google.com/go/docs/reference/cloud.google.com/go/spanner/latest/index.html#cloud_google_com_go_spanner_Statement{\n \t\t\tSQL: `UPDATE AccountTransferAccount SET amount = 300 WHERE id = 1 AND to_id = 2`,\n \t\t}\n \t\trowCount, err := txn.Update(ctx, stmt)\n \t\tif err != nil {\n \t\t\treturn err\n \t\t}\n \t\tfmt.Fprintf(w, \"%d AccountTransferAccount record(s) updated.\\n\", rowCount)\n \t\treturn err\n \t})\n\n \treturn err2\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 static void updateUsingDml(DatabaseClient dbClient) {\n dbClient\n .readWriteTransaction()\n .run(\n transaction -\u003e {\n String sql = \"UPDATE Account SET is_blocked = false WHERE id = 2\";\n long rowCount = transaction.executeUpdate(Statement.of(sql));\n System.out.printf(\"%d Account record(s) updated.\\n\", rowCount);\n return null;\n });\n\n dbClient\n .readWriteTransaction()\n .run(\n transaction -\u003e {\n String sql =\n \"UPDATE AccountTransferAccount SET amount = 300 WHERE id = 1 AND to_id = 2\";\n long rowCount = transaction.executeUpdate(Statement.of(sql));\n System.out.printf(\"%d AccountTransferAccount record(s) updated.\\n\", rowCount);\n return null;\n });\n }\n\n### Python\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 def update_data_with_dml(instance_id, database_id):\n \"\"\"Updates sample data from the database using a DML statement.\"\"\"\n\n spanner_client = spanner.Client()\n instance = spanner_client.instance(instance_id)\n database = instance.database(database_id)\n\n def update_accounts(transaction):\n row_ct = transaction.execute_update(\n \"UPDATE Account SET is_blocked = false WHERE id = 2\"\n )\n\n print(\"{} Account record(s) updated.\".format(row_ct))\n\n def update_transfers(transaction):\n row_ct = transaction.execute_update(\n \"UPDATE AccountTransferAccount SET amount = 300 WHERE id = 1 AND to_id = 2\"\n )\n\n print(\"{} AccountTransferAccount record(s) updated.\".format(row_ct))\n\n database.run_in_transaction(update_accounts)\n database.run_in_transaction(update_transfers)\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)."]]
