জেডিবিসি

/**
 * Create a new database within a Cloud SQL instance.
 */
function createDatabase() {
  try {
    const conn = Jdbc.getCloudSqlConnection(instanceUrl, root, rootPwd);
    conn.createStatement().execute(`CREATE DATABASE ${db}`);
  } catch (err) {
    // TODO(developer) - Handle exception from the API
    console.log("Failed with an error %s", err.message);
  }
}

/**
 * Create a new user for your database with full privileges.
 */
function createUser() {
  try {
    const conn = Jdbc.getCloudSqlConnection(dbUrl, root, rootPwd);

    const stmt = conn.prepareStatement("CREATE USER ? IDENTIFIED BY ?");
    stmt.setString(1, user);
    stmt.setString(2, userPwd);
    stmt.execute();

    conn.createStatement().execute(`GRANT ALL ON \`%\`.* TO ${user}`);
  } catch (err) {
    // TODO(developer) - Handle exception from the API
    console.log("Failed with an error %s", err.message);
  }
}

/**
 * Create a new table in the database.
 */
function createTable() {
  try {
    const conn = Jdbc.getCloudSqlConnection(dbUrl, user, userPwd);
    conn
      .createStatement()
      .execute(
        "CREATE TABLE entries " +
          "(guestName VARCHAR(255), content VARCHAR(255), " +
          "entryID INT NOT NULL AUTO_INCREMENT, PRIMARY KEY(entryID));",
      );
  } catch (err) {
    // TODO(developer) - Handle exception from the API
    console.log("Failed with an error %s", err.message);
  }
}

/**
 * Write one row of data to a table.
 */
function writeOneRecord() {
  try {
    const conn = Jdbc.getCloudSqlConnection(dbUrl, user, userPwd);

    const stmt = conn.prepareStatement(
      "INSERT INTO entries " + "(guestName, content) values (?, ?)",
    );
    stmt.setString(1, "First Guest");
    stmt.setString(2, "Hello, world");
    stmt.execute();
  } catch (err) {
    // TODO(developer) - Handle exception from the API
    console.log("Failed with an error %s", err.message);
  }
}

/**
 * Write 500 rows of data to a table in a single batch.
 */
function writeManyRecords() {
  try {
    const conn = Jdbc.getCloudSqlConnection(dbUrl, user, userPwd);
    conn.setAutoCommit(false);

    const start = new Date();
    const stmt = conn.prepareStatement(
      "INSERT INTO entries " + "(guestName, content) values (?, ?)",
    );
    for (let i = 0; i < 500; i++) {
      stmt.setString(1, `Name ${i}`);
      stmt.setString(2, `Hello, world ${i}`);
      stmt.addBatch();
    }

    const batch = stmt.executeBatch();
    conn.commit();
    conn.close();

    const end = new Date();
    console.log("Time elapsed: %sms for %s rows.", end - start, batch.length);
  } catch (err) {
    // TODO(developer) - Handle exception from the API
    console.log("Failed with an error %s", err.message);
  }
}

/**
 * Write 500 rows of data to a table in a single batch.
 * Recommended for faster writes
 */
function writeManyRecordsUsingExecuteBatch() {
  try {
    const conn = Jdbc.getCloudSqlConnection(dbUrl, user, userPwd);
    conn.setAutoCommit(false);

    const start = new Date();
    const stmt = conn.prepareStatement(
      "INSERT INTO entries " + "(guestName, content) values (?, ?)",
    );
    const params = [];
    for (let i = 0; i < 500; i++) {
      params.push([`Name ${i}`, `Hello, world ${i}`]);
    }

    const batch = stmt.executeBatch(params);
    conn.commit();
    conn.close();

    const end = new Date();
    console.log("Time elapsed: %sms for %s rows.", end - start, batch.length);
  } catch (err) {
    // TODO(developer) - Handle exception from the API
    console.log("Failed with an error %s", err.message);
  }
}

/**
 * Read up to 1000 rows of data from the table and log them.
 */
function readFromTable() {
  try {
    const conn = Jdbc.getCloudSqlConnection(dbUrl, user, userPwd);
    const start = new Date();
    const stmt = conn.createStatement();
    stmt.setMaxRows(1000);
    const results = stmt.executeQuery("SELECT * FROM entries");
    const numCols = results.getMetaData().getColumnCount();

    while (results.next()) {
      let rowString = "";
      for (let col = 0; col < numCols; col++) {
        rowString += `${results.getString(col + 1)}\t`;
      }
      console.log(rowString);
    }

    results.close();
    stmt.close();

    const end = new Date();
    console.log("Time elapsed: %sms", end - start);
  } catch (err) {
    // TODO(developer) - Handle exception from the API
    console.log("Failed with an error %s", err.message);
  }
}

/**
 * Read up to 1000 rows of data from the table and log them.
 * Recommended for faster reads
 */
function readFromTableUsingGetRows() {
  try {
    const conn = Jdbc.getCloudSqlConnection(dbUrl, user, userPwd);
    const start = new Date();
    const stmt = conn.createStatement();
    stmt.setMaxRows(1000);
    const results = stmt.executeQuery("SELECT * FROM entries");
    const numCols = results.getMetaData().getColumnCount();
    const getRowArgs = [];
    for (let col = 0; col < numCols; col++) {
      getRowArgs.push(`getString(${col + 1})`);
    }
    const rows = results.getRows(getRowArgs.join(","));
    for (let i = 0; i < rows.length; i++) {
      console.log(rows[i].join("\t"));
    }

    results.close();
    stmt.close();

    const end = new Date();
    console.log("Time elapsed: %sms", end - start);
  } catch (err) {
    // TODO(developer) - Handle exception from the API
    console.log("Failed with an error %s", err.message);
  }
}