স্প্যানার দিয়ে একটি অনলাইন ব্যাঙ্কিং অ্যাপ্লিকেশন তৈরি করুন

gcloud auth list

Credentialed Accounts

ACTIVE: *
ACCOUNT: <myaccount>@<mydomain>.com

gcloud config list project

[core]
project = <PROJECT_ID>

gcloud config set project <PROJECT_ID>

echo $GOOGLE_CLOUD_PROJECT

<PROJECT_ID>

gcloud services enable spanner.googleapis.com
gcloud services enable aiplatform.googleapis.com
gcloud services enable bigquery.googleapis.com
gcloud services enable bigqueryconnection.googleapis.com

export SPANNER_INSTANCE=cloudspanner-onlinebanking
gcloud spanner instances create $SPANNER_INSTANCE \
  --config=regional-us-central1 \
  --description="Spanner Online Banking" \
  --nodes=1 \
  --edition=ENTERPRISE \
  --default-backup-schedule-type=NONE

Creating instance...done.

mvn -B archetype:generate \
  -DarchetypeGroupId=org.apache.maven.archetypes \
  -DgroupId=com.google.codelabs \
  -DartifactId=onlinebanking \
  -DjavaCompilerVersion=1.8 \
  -DjunitVersion=4.13.2 \
  -DarchetypeVersion=1.5

git clone https://github.com/GoogleCloudPlatform/cloud-spanner-samples.git
cp -r ./cloud-spanner-samples/banking/data ./onlinebanking

cd onlinebanking

<dependencyManagement>
  <dependencies>
    <dependency>
      <groupId>com.google.cloud</groupId>
      <artifactId>libraries-bom</artifactId>
      <version>26.56.0</version>
      <type>pom</type>
      <scope>import</scope>
    </dependency>
  </dependencies>
</dependencyManagement>

<dependencies>
  <dependency>
    <groupId>junit</groupId>
    <artifactId>junit</artifactId>
    <version>4.13.2</version>
    <scope>test</scope>
  </dependency>
  <dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-nop</artifactId>
    <version>2.0.9</version>
  </dependency>
  <dependency>
    <groupId>com.opencsv</groupId>
    <artifactId>opencsv</artifactId>
    <version>5.10</version>
  </dependency>
  <dependency>
    <groupId>com.google.cloud</groupId>
    <artifactId>google-cloud-spanner</artifactId>
  </dependency>
  <dependency>
    <groupId>com.google.cloud</groupId>
    <artifactId>google-cloud-bigquery</artifactId>
  </dependency>
  <dependency>
    <groupId>com.google.cloud</groupId>
    <artifactId>google-cloud-bigqueryconnection</artifactId>
  </dependency>
</dependencies>

<build>
  <plugins>
    <plugin>
      <artifactId>maven-resources-plugin</artifactId>
      <version>3.3.1</version>
      <executions>
        <execution>
          <id>copy-resources</id>
          <phase>process-resources</phase>
          <goals>
            <goal>copy-resources</goal>
          </goals>
          <configuration>
            <outputDirectory>${project.build.directory}/${project.artifactId}-resources</outputDirectory>
            <resources>
              <resource>
                <directory>resources</directory>
                <filtering>true</filtering>
              </resource>
            </resources>
          </configuration>
        </execution>
      </executions>
    </plugin>
    <plugin>
      <groupId>org.apache.maven.plugins</groupId>
      <artifactId>maven-dependency-plugin</artifactId>
      <version>3.8.1</version>
      <executions>
        <execution>
          <id>copy-dependencies</id>
          <phase>prepare-package</phase>
          <goals>
            <goal>copy-dependencies</goal>
          </goals>
          <configuration>
            <outputDirectory>${project.build.directory}/${project.artifactId}-resources/lib</outputDirectory>
            <overWriteReleases>false</overWriteReleases>
            <overWriteSnapshots>false</overWriteSnapshots>
            <overWriteIfNewer>true</overWriteIfNewer>
          </configuration>
        </execution>
      </executions>
    </plugin>
    <plugin>
      <groupId>org.apache.maven.plugins</groupId>
      <artifactId>maven-jar-plugin</artifactId>
      <version>3.4.2</version>
      <configuration>
        <finalName>${project.artifactId}</finalName>
        <outputDirectory>${project.build.directory}</outputDirectory>
        <archive>
          <index>false</index>
          <manifest>
            <mainClass>com.google.codelabs.App</mainClass>
            <addClasspath>true</addClasspath>
            <classpathPrefix>${project.artifactId}-resources/lib/</classpathPrefix>
          </manifest>
        </archive>
      </configuration>
    </plugin>
    <plugin>
      <groupId>org.apache.maven.plugins</groupId>
      <artifactId>maven-failsafe-plugin</artifactId>
      <version>3.2.5</version>
      <executions>
        <execution>
          <goals>
            <goal>integration-test</goal>
          </goals>
        </execution>
      </executions>
    </plugin>
    <plugin>
      <groupId>org.apache.maven.plugins</groupId>
      <artifactId>maven-surefire-plugin</artifactId>
      <version>3.2.5</version>
      <configuration>
        <useSystemClassLoader>false</useSystemClassLoader>
      </configuration>
    </plugin>
  </plugins>
</build>

package com.google.codelabs;

import java.util.Arrays;
import java.util.List;
import java.util.concurrent.ExecutionException;

import com.google.api.gax.longrunning.OperationFuture;
import com.google.cloud.bigquery.BigQuery;
import com.google.cloud.bigquery.BigQueryOptions;
import com.google.cloud.spanner.Database;
import com.google.cloud.spanner.DatabaseAdminClient;
import com.google.cloud.spanner.DatabaseClient;
import com.google.cloud.spanner.DatabaseId;
import com.google.cloud.spanner.Spanner;
import com.google.cloud.spanner.SpannerException;
import com.google.cloud.spanner.SpannerExceptionFactory;
import com.google.cloud.spanner.SpannerOptions;
import com.google.spanner.admin.database.v1.CreateDatabaseMetadata;

public class App {

  // Create the Spanner database and schema
  public static void create(DatabaseAdminClient dbAdminClient, DatabaseId db,
      String location, String model) {
    System.out.println("Creating Spanner database...");
    List<String> statements = Arrays.asList(
      "CREATE TABLE Customers (\n"
          + "  CustomerId INT64 NOT NULL,\n"
          + "  FirstName STRING(256) NOT NULL,\n"
          + "  LastName STRING(256) NOT NULL,\n"
          + "  FullName STRING(512) AS (FirstName || ' ' || LastName) STORED,\n"
          + "  Email STRING(512) NOT NULL,\n"
          + "  EmailTokens TOKENLIST AS\n"
          + "    (TOKENIZE_SUBSTRING(Email, ngram_size_min=>2, ngram_size_max=>3,\n"
          + "      relative_search_types=>[\"all\"])) HIDDEN,\n"
          + "  Address STRING(MAX)\n"
          + ") PRIMARY KEY (CustomerId)",

      "CREATE INDEX CustomersByEmail\n"
          + "ON Customers(Email)",

      "CREATE SEARCH INDEX CustomersFuzzyEmail\n"
          + "ON Customers(EmailTokens)",

      "CREATE TABLE Accounts (\n"
          + "  AccountId INT64 NOT NULL,\n"
          + "  CustomerId INT64 NOT NULL,\n"
          + "  AccountType STRING(256) NOT NULL,\n"
          + "  Balance NUMERIC NOT NULL,\n"
          + "  OpenDate TIMESTAMP NOT NULL\n"
          + ") PRIMARY KEY (AccountId)",

      "CREATE INDEX AccountsByCustomer\n"
          + "ON Accounts (CustomerId)",

      "CREATE TABLE TransactionLedger (\n"
          + "  TransactionId INT64 NOT NULL,\n"
          + "  AccountId INT64 NOT NULL,\n"
          + "  TransactionType STRING(256) NOT NULL,\n"
          + "  Amount NUMERIC NOT NULL,\n"
          + "  Timestamp TIMESTAMP NOT NULL"
          + "  OPTIONS(allow_commit_timestamp=true),\n"
          + "  Category STRING(256),\n"
          + "  Description STRING(MAX),\n"
          + "  CategoryTokens TOKENLIST AS (TOKENIZE_FULLTEXT(Category)) HIDDEN,\n"
          + "  DescriptionTokens TOKENLIST AS (TOKENIZE_FULLTEXT(Description)) HIDDEN\n"
          + ") PRIMARY KEY (AccountId, TransactionId),\n"
          + "INTERLEAVE IN PARENT Accounts ON DELETE CASCADE",

      "CREATE INDEX TransactionLedgerByAccountType\n"
          + "ON TransactionLedger(AccountId, TransactionType)",

      "CREATE INDEX TransactionLedgerByCategory\n"
          + "ON TransactionLedger(AccountId, Category)",

      "CREATE SEARCH INDEX TransactionLedgerTextSearch\n"
          + "ON TransactionLedger(CategoryTokens, DescriptionTokens)",

      "CREATE MODEL TransactionCategoryModel\n"
          + "INPUT (prompt STRING(MAX))\n"
          + "OUTPUT (content STRING(MAX))\n"
          + "REMOTE OPTIONS (\n"
          + "  endpoint = '//aiplatform.googleapis.com/projects/" + db.getInstanceId().getProject()
              + "/locations/" + location + "/publishers/google/models/" + model + "',\n"
          + "  default_batch_size = 1\n"
          + ")");
    OperationFuture<Database, CreateDatabaseMetadata> op = dbAdminClient.createDatabase(
        db.getInstanceId().getInstance(),
        db.getDatabase(),
        statements);
    try {
      Database dbOperation = op.get();
      System.out.println("Created Spanner database [" + dbOperation.getId() + "]");
    } catch (ExecutionException e) {
      throw (SpannerException) e.getCause();
    } catch (InterruptedException e) {
      throw SpannerExceptionFactory.propagateInterrupt(e);
    }
  }

  static void printUsageAndExit() {
    System.out.println("Online Online Banking Application 1.0.0");
    System.out.println("Usage:");
    System.out.println("  java -jar target/onlinebanking.jar <command> [command_option(s)]");
    System.out.println("");
    System.out.println("Examples:");
    System.out.println("  java -jar target/onlinebanking.jar create");
    System.out.println("      - Create a sample Spanner database and schema in your "
        + "project.\n");
    System.exit(1);
  }

  public static void main(String[] args) {
    if (args.length < 1) {
      printUsageAndExit();
    }

    String instanceId = System.getProperty("SPANNER_INSTANCE", System.getenv("SPANNER_INSTANCE"));
    String databaseId = System.getProperty("SPANNER_DATABASE", System.getenv("SPANNER_DATABASE"));
    String location = System.getenv().getOrDefault("SPANNER_LOCATION", "us-central1");
    String model = System.getenv().getOrDefault("SPANNER_MODEL", "gemini-2.0-flash-lite");
    if (instanceId == null || databaseId == null) {
      System.err.println("Missing one or more required environment variables: SPANNER_INSTANCE or "
          + "SPANNER_DATABASE");
      System.exit(1);
    }

    BigQueryOptions bigqueryOptions = BigQueryOptions.newBuilder().build();
    BigQuery bigquery = bigqueryOptions.getService();

    SpannerOptions spannerOptions = SpannerOptions.newBuilder().build();
    try (Spanner spanner = spannerOptions.getService()) {
      String command = args[0];
      DatabaseId db = DatabaseId.of(spannerOptions.getProjectId(), instanceId, databaseId);
      DatabaseClient dbClient = spanner.getDatabaseClient(db);
      DatabaseAdminClient dbAdminClient = spanner.getDatabaseAdminClient();

      switch (command) {
        case "create":
          create(dbAdminClient, db, location, model);
          break;
        default:
          printUsageAndExit();
      }
    }
  }
}

mvn package

[INFO] Building jar: /home/your_user/onlinebanking/target/onlinebanking.jar
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS

java -jar target/onlinebanking.jar

Online Banking Application 1.0.0
Usage:
  java -jar target/onlinebanking.jar <command> [command_option(s)]

Examples:
  java -jar target/onlinebanking.jar create
      - Create a sample Spanner database and schema in your project.

export SPANNER_INSTANCE=cloudspanner-onlinebanking
export SPANNER_DATABASE=onlinebanking

java -jar target/onlinebanking.jar create

Creating Spanner database...
Created Spanner database [<DATABASE_RESOURCE_NAME>]

package com.google.codelabs;

import java.io.FileReader;
import java.math.BigDecimal;
import java.time.Duration;
import java.time.Instant;
import java.time.temporal.ChronoUnit;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Random;
import java.util.concurrent.ExecutionException;

import com.google.api.gax.longrunning.OperationFuture;
import com.google.cloud.Timestamp;
import com.google.cloud.bigquery.BigQuery;
import com.google.cloud.bigquery.BigQueryOptions;
import com.google.cloud.spanner.Database;
import com.google.cloud.spanner.DatabaseAdminClient;
import com.google.cloud.spanner.DatabaseClient;
import com.google.cloud.spanner.DatabaseId;
import com.google.cloud.spanner.Key;
import com.google.cloud.spanner.Spanner;
import com.google.cloud.spanner.SpannerException;
import com.google.cloud.spanner.SpannerExceptionFactory;
import com.google.cloud.spanner.SpannerOptions;
import com.google.cloud.spanner.Statement;
import com.google.cloud.spanner.Struct;
import com.google.spanner.admin.database.v1.CreateDatabaseMetadata;
import com.opencsv.CSVReader;

  // Insert customers from CSV
  public static void insertCustomers(DatabaseClient dbClient) {
    System.out.println("Inserting customers...");
    dbClient
        .readWriteTransaction()
        .run(transaction -> {
          int count = 0;
          List<Statement> statements = new ArrayList<>();
          try (CSVReader reader = new CSVReader(new FileReader("data/customers.csv"))) {
            reader.skip(1);
            String[] line;
            while ((line = reader.readNext()) != null) {
              Statement statement = Statement.newBuilder(
                  "INSERT INTO Customers (CustomerId, FirstName, LastName, Email, Address) "
                      + "VALUES (@customerId, @firstName, @lastName, @email, @address)")
                  .bind("customerId").to(Long.parseLong(line[0]))
                  .bind("firstName").to(line[1])
                  .bind("lastName").to(line[2])
                  .bind("email").to(line[3])
                  .bind("address").to(line[4])
                  .build();
              statements.add(statement);
              count++;
            }
            transaction.batchUpdate(statements);
            System.out.println("Inserted " + count + " customers");
            return null;
          }
        });
  }

  // Insert accounts from CSV
  public static void insertAccounts(DatabaseClient dbClient) {
    System.out.println("Inserting accounts...");
    dbClient
        .readWriteTransaction()
        .run(transaction -> {
          int count = 0;
          List<Statement> statements = new ArrayList<>();
          try (CSVReader reader = new CSVReader(new FileReader("data/accounts.csv"))) {
            reader.skip(1);
            String[] line;
            while ((line = reader.readNext()) != null) {
              Statement statement = Statement.newBuilder(
                "INSERT INTO Accounts (AccountId, CustomerId, AccountType, Balance, OpenDate) "
                    + "VALUES (@accountId, @customerId, @accountType, @balance, @openDate)")
                .bind("accountId").to(Long.parseLong(line[0]))
                .bind("customerId").to(Long.parseLong(line[1]))
                .bind("accountType").to(line[2])
                .bind("balance").to(new BigDecimal(line[3]))
                .bind("openDate").to(line[4])
                .build();
              statements.add(statement);
              count++;
            }
            transaction.batchUpdate(statements);
            System.out.println("Inserted " + count + " accounts");
            return null;
          }
        });
  }

  // Insert transactions from CSV
  public static void insertTransactions(DatabaseClient dbClient) {
    System.out.println("Inserting transactions...");
    dbClient
        .readWriteTransaction()
        .run(transaction -> {
          int count = 0;
          List<Statement> statements = new ArrayList<>();
          try (CSVReader reader = new CSVReader(new FileReader("data/transactions.csv"))) {
            reader.skip(1);
            String[] line;

            // Specify timestamps that are within last 30 days
            Random random = new Random();
            Instant startTime = Instant.now().minus(15, ChronoUnit.DAYS);
            Instant currentTimestamp = startTime;

            Map<Long, BigDecimal> balanceChanges = new HashMap<>();
            while ((line = reader.readNext()) != null) {
              long accountId = Long.parseLong(line[1]);
              String transactionType = line[2];
              BigDecimal amount = new BigDecimal(line[3]);
              int randomMinutes = random.nextInt(60) + 1;
              currentTimestamp = currentTimestamp.plus(Duration.ofMinutes(randomMinutes));
              Timestamp timestamp = Timestamp.ofTimeSecondsAndNanos(
                  currentTimestamp.getEpochSecond(), currentTimestamp.getNano());
              Statement statement = Statement.newBuilder(
                "INSERT INTO TransactionLedger (TransactionId, AccountId, TransactionType, Amount,"
                    + "Timestamp, Category, Description) "
                    + "VALUES (@transactionId, @accountId, @transactionType, @amount, @timestamp,"
                    + "@category, @description)")
                .bind("transactionId").to(Long.parseLong(line[0]))
                .bind("accountId").to(accountId)
                .bind("transactionType").to(transactionType)
                .bind("amount").to(amount)
                .bind("timestamp").to(timestamp)
                .bind("category").to(line[5])
                .bind("description").to(line[6])
                .build();
              statements.add(statement);

              // Track balance changes per account
              BigDecimal balanceChange = balanceChanges.getOrDefault(accountId,
                  BigDecimal.ZERO);
              if ("Credit".equalsIgnoreCase(transactionType)) {
                balanceChanges.put(accountId, balanceChange.add(amount));
              } else if ("Debit".equalsIgnoreCase(transactionType)) {
                balanceChanges.put(accountId, balanceChange.subtract(amount));
              } else {
                System.err.println("Unsupported transaction type: " + transactionType);
                continue;
              }

              count++;
            }

            // Apply final balance updates
            for (Map.Entry<Long, BigDecimal> entry : balanceChanges.entrySet()) {
              long accountId = entry.getKey();
              BigDecimal balanceChange = entry.getValue();

              Struct row = transaction.readRow(
                  "Accounts",
                  Key.of(accountId),
                  List.of("Balance"));
              if (row != null) {
                BigDecimal currentBalance = row.getBigDecimal("Balance");
                BigDecimal updatedBalance = currentBalance.add(balanceChange);
                Statement statement = Statement.newBuilder(
                  "UPDATE Accounts SET Balance = @balance WHERE AccountId = @accountId")
                  .bind("accountId").to(accountId)
                  .bind("balance").to(updatedBalance)
                  .build();
                statements.add(statement);
              }
            }

            transaction.batchUpdate(statements);
            System.out.println("Inserted " + count + " transactions");
          }
          return null;
        });
  }

        case "insert":
          String insertType = (args.length >= 2) ? args[1] : "";
          if (insertType.equals("customers")) {
            insertCustomers(dbClient);
          } else if (insertType.equals("accounts")) {
            insertAccounts(dbClient);
          } else if (insertType.equals("transactions")) {
            insertTransactions(dbClient);
          } else {
            insertCustomers(dbClient);
            insertAccounts(dbClient);
            insertTransactions(dbClient);
          }
          break;

    System.out.println("  java -jar target/onlinebanking.jar insert");
    System.out.println("      - Insert sample Customers, Accounts, and Transactions into the "
        + "database.\n");

mvn package

java -jar target/onlinebanking.jar insert

Inserting customers...
Inserted 100 customers
Inserting accounts...
Inserted 125 accounts
Inserting transactions...
Inserted 200 transactions

  // Use Vertex AI to set the category of transactions
  public static void categorize(DatabaseClient dbClient) {
    System.out.println("Categorizing transactions...");
    try {
      // Create a prompt to instruct the LLM how to categorize the transactions
      String categories = String.join(", ", Arrays.asList("Entertainment", "Gifts", "Groceries",
          "Investment", "Medical", "Movies", "Online Shopping", "Other", "Purchases", "Refund",
          "Restaurants", "Salary", "Transfer", "Transportation", "Utilities"));
      String prompt = "Categorize the following financial activity into one of these "
          + "categories: " +  categories + ". Return Other if the description cannot be mapped to "
          + "one of these categories.  Only return the exact category string, no other text or "
          + "punctuation or reasoning. Description: ";
      String sql = "UPDATE TransactionLedger SET Category = (\n"
          + "  SELECT content FROM ML.PREDICT(MODEL `TransactionCategoryModel`, (\n"
          + "    SELECT CONCAT('" + prompt + "', CASE WHEN TRIM(Description) = ''\n"
          + "    THEN 'Other' ELSE Description END) AS prompt\n"
          + "  ))\n"
          + ") WHERE TRUE";

      // Use partitioned update to batch update a large number of rows
      dbClient.executePartitionedUpdate(Statement.of(sql));
      System.out.println("Completed categorizing transactions");
    } catch (SpannerException e) {
      throw e;
    }
  }

        case "categorize":
          categorize(dbClient);
          break;

    System.out.println("  java -jar target/onlinebanking.jar categorize");
    System.out.println("      - Use AI to categorize transactions in the database.\n");

mvn package

java -jar target/onlinebanking.jar categorize

Categorizing transactions...
Completed categorizing transactions

package com.google.codelabs;

import java.io.FileReader;
import java.math.BigDecimal;
import java.time.Duration;
import java.time.Instant;
import java.time.temporal.ChronoUnit;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Random;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;

import com.google.api.gax.longrunning.OperationFuture;
import com.google.cloud.Timestamp;
import com.google.cloud.bigquery.BigQuery;
import com.google.cloud.bigquery.BigQueryOptions;
import com.google.cloud.spanner.Database;
import com.google.cloud.spanner.DatabaseAdminClient;
import com.google.cloud.spanner.DatabaseClient;
import com.google.cloud.spanner.DatabaseId;
import com.google.cloud.spanner.Key;
import com.google.cloud.spanner.ReadOnlyTransaction;
import com.google.cloud.spanner.ResultSet;
import com.google.cloud.spanner.Spanner;
import com.google.cloud.spanner.SpannerException;
import com.google.cloud.spanner.SpannerExceptionFactory;
import com.google.cloud.spanner.SpannerOptions;
import com.google.cloud.spanner.Statement;
import com.google.cloud.spanner.Struct;
import com.google.cloud.spanner.TimestampBound;
import com.google.spanner.admin.database.v1.CreateDatabaseMetadata;
import com.opencsv.CSVReader;

  // Get current account balance(s) by customer
  public static void getBalance(DatabaseClient dbClient, long customerId) {
    String query = "SELECT AccountId, Balance\n"
        + "FROM Accounts\n"
        + "WHERE CustomerId = @customerId";
    Statement statement = Statement.newBuilder(query)
        .bind("customerId").to(customerId)
        .build();

    // Ignore ongoing transactions, use stale reads as seconds-old data is sufficient
    TimestampBound stalenessBound = TimestampBound.ofMaxStaleness(5, TimeUnit.SECONDS);
    try (ReadOnlyTransaction transaction = dbClient.singleUseReadOnlyTransaction(stalenessBound);
        ResultSet resultSet = transaction.executeQuery(statement);) {
      System.out.println("Account balances for customer " + customerId + ":");
      while (resultSet.next()) {
        System.out.println("  Account " + resultSet.getLong("AccountId") + ": "
            + resultSet.getBigDecimal("Balance"));
      }
    }
  }

  // Find customers by email
  public static void findCustomers(DatabaseClient dbClient, String email) {
    // Query using fuzzy search (ngrams) to allow for spelling mistakes
    String query = "SELECT CustomerId, Email\n"
        + "FROM Customers\n"
        + "WHERE SEARCH_NGRAMS(EmailTokens, @email)\n"
        + "ORDER BY SCORE_NGRAMS(EmailTokens, @email) DESC\n"
        + "LIMIT 10";
    Statement statement = Statement.newBuilder(query)
        .bind("email").to(email)
        .build();

    try (ReadOnlyTransaction transaction = dbClient.singleUseReadOnlyTransaction();
        ResultSet resultSet = transaction.executeQuery(statement)) {
      System.out.println("Customer emails matching " + email + " (top 10 matches):");
      while (resultSet.next()) {
        System.out.println("  Customer " + resultSet.getLong("CustomerId") + ": "
            + resultSet.getString("Email"));
      }
    }
  }

  // Get total monthly spending for a customer by category
  public static void getSpending(DatabaseClient dbClient, long customerId, String category) {
    // Query category using full-text search
    String query = "SELECT SUM(Amount) as TotalSpending\n"
        + "FROM TransactionLedger t\n"
        + "JOIN Accounts a\n"
        + "  ON t.AccountId = a.AccountId\n"
        + "WHERE t.TransactionType = 'Debit'\n"
        + "  AND a.CustomerId = @customerId\n"
        + "  AND t.Timestamp >= TIMESTAMP_ADD(CURRENT_TIMESTAMP(), INTERVAL -30 DAY)\n"
        + "  AND (SEARCH(t.CategoryTokens, @category) OR SEARCH(t.DescriptionTokens, @category))";
    Statement statement = Statement.newBuilder(query)
        .bind("customerId").to(customerId)
        .bind("category").to(category)
        .build();

    try (ReadOnlyTransaction transaction = dbClient.singleUseReadOnlyTransaction();
        ResultSet resultSet = transaction.executeQuery(statement);) {
      System.out.println("Total spending for customer " + customerId + " under category "
          + category + ":");
      while (resultSet.next()) {
        BigDecimal totalSpending = BigDecimal.ZERO;
        if (!resultSet.isNull("TotalSpending")) {
          totalSpending = resultSet.getBigDecimal("TotalSpending");
        }
        System.out.println("  " + totalSpending);
      }
    }
  }

        case "query":
          String queryType = (args.length >= 2) ? args[1] : "";
          if (queryType.equals("balance")) {
            long customerId = (args.length >= 3) ? Long.parseLong(args[2]) : 1L;
            getBalance(dbClient, customerId);
          } else if (queryType.equals("email")) {
            String email = (args.length >= 3) ? args[2] : "";
            findCustomers(dbClient, email);
          } else if (queryType.equals("spending")) {
            long customerId = (args.length >= 3) ? Long.parseLong(args[2]) : 1L;
            String category = (args.length >= 4) ? args[3] : "";
            getSpending(dbClient, customerId, category);
          } else {
            printUsageAndExit();
          }
          break;

    System.out.println("  java -jar target/onlinebanking.jar query balance 1");
    System.out.println("      - Query customer account balance(s) by customer id.\n");
    System.out.println("  java -jar target/onlinebanking.jar query email madi");
    System.out.println("      - Find customers by email using fuzzy search.\n");
    System.out.println("  java -jar target/onlinebanking.jar query spending 1 groceries");
    System.out.println("      - Query customer spending by customer id and category using "
        + "full-text search.\n");

mvn package

  "CREATE INDEX AccountsByCustomer\n"
          + "ON Accounts (CustomerId)",

java -jar target/onlinebanking.jar query balance 1

Account balances for customer 1:
  Account 1: 9875.25
  Account 7: 9900
  Account 110: 38200

java -jar target/onlinebanking.jar query balance 5
java -jar target/onlinebanking.jar query balance 10
java -jar target/onlinebanking.jar query balance 99

CREATE TABLE Customers (
  ...
  EmailTokens TOKENLIST AS (TOKENIZE_SUBSTRING(Email,
    ngram_size_min=>2,
    ngram_size_max=>3,
    relative_search_types=>["all"])) HIDDEN,
) PRIMARY KEY(CustomerId);

CREATE SEARCH INDEX CustomersFuzzyEmail ON Customers(EmailTokens);

java -jar target/onlinebanking.jar query email madi

Customer emails matching madi (top 10 matches):
  Customer 39: madison.perez@example.com
  Customer 64: mason.gray@example.com
  Customer 91: mabel.alexander@example.com

java -jar target/onlinebanking.jar query email emily
java -jar target/onlinebanking.jar query email emliy
java -jar target/onlinebanking.jar query email emilee

Customer emails matching emliy (top 10 matches):
  Customer 31: emily.lopez@example.com

CREATE TABLE TransactionLedger (
  ...
  CategoryTokens TOKENLIST AS (TOKENIZE_FULLTEXT(Category)) HIDDEN,
  DescriptionTokens TOKENLIST AS (TOKENIZE_FULLTEXT(Description)) HIDDEN,
) PRIMARY KEY(AccountId, TransactionId),
  INTERLEAVE IN PARENT Accounts ON DELETE CASCADE;

CREATE SEARCH INDEX TransactionLedgerTextSearch ON TransactionLedger(CategoryTokens, DescriptionTokens);

java -jar target/onlinebanking.jar query spending 1 groceries

Total spending for customer 1 under category groceries:
  50

java -jar target/onlinebanking.jar query spending 1 transportation
java -jar target/onlinebanking.jar query spending 1 restaurants
java -jar target/onlinebanking.jar query spending 12 entertainment

bq mk --location=us-central1 MarketingCampaigns

Dataset '<PROJECT_ID>:MarketingCampaigns' successfully created.

bq mk --table MarketingCampaigns.CustomerSegments CampaignId:STRING,CampaignName:STRING,CustomerId:INT64

Table '<PROJECT_ID>:MarketingCampaigns.CustomerSegments' successfully created.

bq mk --connection \
  --connection_type=CLOUD_SPANNER \
  --properties="{\"database\": \"projects/$GOOGLE_CLOUD_PROJECT/instances/cloudspanner-onlinebanking/databases/onlinebanking\", \"useParallelism\": true, \"useDataBoost\": true}" \
  --location=us-central1 \
  spanner-connection

Connection <PROJECT_NUMBER>.us-central1.spanner-connection successfully created

bq query --use_legacy_sql=false '
INSERT INTO MarketingCampaigns.CustomerSegments (CampaignId, CampaignName, CustomerId)
VALUES
  ("campaign1", "Spring Promotion", 1),
  ("campaign1", "Spring Promotion", 3),
  ("campaign1", "Spring Promotion", 5),
  ("campaign1", "Spring Promotion", 7),
  ("campaign1", "Spring Promotion", 9),
  ("campaign1", "Spring Promotion", 11)'

Waiting on bqjob_r76a7ce76c5ec948f_0000019644bda052_1 ... (0s) Current status: DONE
Number of affected rows: 6

bq query --use_legacy_sql=false "SELECT * FROM MarketingCampaigns.CustomerSegments"

+------------+------------------+------------+
| CampaignId |   CampaignName   | CustomerId |
+------------+------------------+------------+
| campaign1  | Spring Promotion |          1 |
| campaign1  | Spring Promotion |          5 |
| campaign1  | Spring Promotion |          7 |
| campaign1  | Spring Promotion |          9 |
| campaign1  | Spring Promotion |         11 |
| campaign1  | Spring Promotion |          3 |
+------------+------------------+------------+

package com.google.codelabs;

import java.io.FileReader;
import java.math.BigDecimal;
import java.time.Duration;
import java.time.Instant;
import java.time.temporal.ChronoUnit;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Random;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;

import com.google.api.gax.longrunning.OperationFuture;
import com.google.cloud.Timestamp;
import com.google.cloud.bigquery.BigQuery;
import com.google.cloud.bigquery.BigQueryException;
import com.google.cloud.bigquery.BigQueryOptions;
import com.google.cloud.bigquery.connection.v1.ConnectionName;
import com.google.cloud.bigquery.JobException;
import com.google.cloud.bigquery.QueryJobConfiguration;
import com.google.cloud.bigquery.TableResult;
import com.google.cloud.spanner.Database;
import com.google.cloud.spanner.DatabaseAdminClient;
import com.google.cloud.spanner.DatabaseClient;
import com.google.cloud.spanner.DatabaseId;
import com.google.cloud.spanner.Key;
import com.google.cloud.spanner.ReadOnlyTransaction;
import com.google.cloud.spanner.ResultSet;
import com.google.cloud.spanner.Spanner;
import com.google.cloud.spanner.SpannerException;
import com.google.cloud.spanner.SpannerExceptionFactory;
import com.google.cloud.spanner.SpannerOptions;
import com.google.cloud.spanner.Statement;
import com.google.cloud.spanner.Struct;
import com.google.cloud.spanner.TimestampBound;
import com.google.spanner.admin.database.v1.CreateDatabaseMetadata;
import com.opencsv.CSVReader;

  // Get customers for quarterly marketing campaign in BigQuery using Spanner data
  public static void campaign(BigQuery bq, DatabaseId db, String location, String campaignId,
      int threshold) {
    // The BigQuery dataset, table, and Spanner connection must already exist for this to succeed
    ConnectionName connection = ConnectionName.of(db.getInstanceId().getProject(), location,
        "spanner-connection");

    // Use a federated query to bring Spanner data into BigQuery
    String bqQuery = "SELECT cs.CampaignName, c.CustomerId, c.FullName, t.TotalSpending\n"
        + "FROM MarketingCampaigns.CustomerSegments cs\n"
        + "JOIN EXTERNAL_QUERY('" + connection.toString() + "',\n"
        + "  \"SELECT t.AccountId, SUM(t.Amount) AS TotalSpending"
        + "   FROM TransactionLedger t"
        + "   WHERE t.Timestamp >= TIMESTAMP_ADD(CURRENT_TIMESTAMP(), INTERVAL -90 DAY)"
        + "   GROUP BY t.AccountId"
        + "   HAVING SUM(t.Amount) > " + threshold + "\"\n"
        + ") t ON cs.CustomerId = t.AccountId\n"
        + "JOIN EXTERNAL_QUERY('" + connection.toString() + "',\n"
        + "  \"SELECT CustomerId, FullName"
        + "   FROM Customers\"\n"
        + ") c ON c.CustomerId = cs.CustomerId\n"
        + "WHERE cs.CampaignId = '" + campaignId + "'";
    try {
      QueryJobConfiguration queryConfig = QueryJobConfiguration.newBuilder(bqQuery).build();
      TableResult results = bq.query(queryConfig);

      System.out.println("Customers for campaign (" + campaignId + "):");
      results.iterateAll().forEach(row -> {
        System.out.println("  " + row.get("FullName").getStringValue()
            + " (" + row.get("CustomerId").getStringValue() + ")");
      });
    } catch (JobException e) {
      throw (BigQueryException) e.getCause();
    } catch (InterruptedException e) {
      throw SpannerExceptionFactory.propagateInterrupt(e);
    }
  }

        case "campaign":
          String campaignId = (args.length >= 2) ? args[1] : "";
          int threshold = (args.length >= 3) ? Integer.parseInt(args[2]) : 5000;
          campaign(bigquery, db, location, campaignId, threshold);
          break;

    System.out.println("  java -jar target/onlinebanking.jar campaign campaign1 5000");
    System.out.println("      - Use Federated Queries (BigQuery) to find customers that match a "
        + "marketing campaign by name based on a recent spending threshold.\n");

mvn package

java -jar target/onlinebanking.jar campaign campaign1 5000

Customers for campaign (campaign1):
  Alice Smith (1)
  Eve Davis (5)
  Kelly Thomas (11)

java -jar target/onlinebanking.jar campaign campaign1 2500

Customers for campaign (campaign1):
  Alice Smith (1)
  Charlie Williams (3)
  Eve Davis (5)
  Ivy Taylor (9)
  Kelly Thomas (11)

gcloud spanner instances delete cloudspanner-onlinebanking

Delete instance [cloudspanner-onlinebanking]. Are you sure?

Do you want to continue (Y/n)?

bq rm --connection --location=us-central1 spanner-connection
bq rm -r MarketingCampaigns

rm: remove dataset '<PROJECT_ID>:MarketingCampaigns'? (y/N)