使用查询选项的 JDBC 连接

使用 JDBC 设置连接查询选项。

深入探索

如需查看包含此代码示例的详细文档,请参阅以下内容:

代码示例

Java

如需了解如何安装和使用 Spanner 客户端库,请参阅 Spanner 客户端库

如需向 Spanner 进行身份验证,请设置应用默认凭据。 如需了解详情,请参阅为本地开发环境设置身份验证

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

class ConnectionWithQueryOptionsExample {

  static void connectionWithQueryOptions() throws SQLException {
    // TODO(developer): Replace these variables before running the sample.
    String projectId = "my-project";
    String instanceId = "my-instance";
    String databaseId = "my-database";
    connectionWithQueryOptions(projectId, instanceId, databaseId);
  }

  static void connectionWithQueryOptions(String projectId, String instanceId, String databaseId)
      throws SQLException {
    String optimizerVersion = "1";
    String connectionUrl =
        String.format(
            "jdbc:cloudspanner:/projects/%s/instances/%s/databases/%s?optimizerVersion=%s",
            projectId, instanceId, databaseId, optimizerVersion);
    try (Connection connection = DriverManager.getConnection(connectionUrl);
        Statement statement = connection.createStatement()) {
      // Execute a query using the optimizer version '1'.
      try (ResultSet rs =
          statement.executeQuery(
              "SELECT SingerId, FirstName, LastName FROM Singers ORDER BY LastName")) {
        while (rs.next()) {
          System.out.printf("%d %s %s%n", rs.getLong(1), rs.getString(2), rs.getString(3));
        }
      }
      try (ResultSet rs = statement.executeQuery("SHOW VARIABLE OPTIMIZER_VERSION")) {
        while (rs.next()) {
          System.out.printf("Optimizer version: %s%n", rs.getString(1));
        }
      }
    }
  }
}

后续步骤

如需搜索和过滤其他 Google Cloud 产品的代码示例,请参阅 Google Cloud 示例浏览器