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JDBC Driver for Google Cloud Spanner

There is a newer version: 1.1.6

package nl.topicus.jdbc;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.SQLFeatureNotSupportedException;
import nl.topicus.jdbc.metadata.AbstractCloudSpannerWrapper;

public abstract class AbstractCloudSpannerFetcher extends AbstractCloudSpannerWrapper {
  private int fetchSize = 1;

  private int direction = ResultSet.FETCH_FORWARD;

  /**
   * 
   * @param direction The fetch direction to use. Only {@link ResultSet#FETCH_FORWARD} is supported.
   * @throws SQLException Thrown if any other fetch direction than {@link ResultSet#FETCH_FORWARD}
   *         is supplied
   */
  public void setFetchDirection(int direction) throws SQLException {
    if (direction != ResultSet.FETCH_FORWARD)
      throw new SQLFeatureNotSupportedException("Only FETCH_FORWARD is supported");
    this.direction = direction;
  }

  /**
   * 
   * @return Always returns {@link ResultSet#FETCH_FORWARD}
   * @throws SQLException Cannot be thrown by this method, but is added to the method signature in
   *         order to comply with the interfaces that will be implemented by this abstract class'
   *         concrete subclasses
   */
  public int getFetchDirection() throws SQLException {
    if (this.direction != ResultSet.FETCH_FORWARD)
      throw new SQLFeatureNotSupportedException("Only FETCH_FORWARD is supported");
    return this.direction;
  }

  /**
   * 
   * @param rows The number of rows to fetch
   * @throws SQLException Thrown if rows<1
   * 
   */
  public void setFetchSize(int rows) throws SQLException {
    if (rows < 1)
      throw new SQLException("rows cannot be less than 1");
    this.fetchSize = rows;
  }

  /**
   * 
   * @return The number of rows to fetch
   * @throws SQLException Cannot be thrown by this method, but is added to the method signature in
   *         order to comply with the interfaces that will be implemented by this abstract class'
   *         concrete subclasses
   */
  public int getFetchSize() throws SQLException {
    if (fetchSize < 1)
      throw new SQLException("fetchSize cannot be less than 1");
    return fetchSize;
  }

}