程序包 com.mysql.cj.result

接口 Row

    • 方法概要

      所有方法 实例方法 抽象方法 默认方法 
      修饰符和类型 方法 说明
      default byte[] getBytes​(int columnIndex)
      Returns the value at the given column as a byte array.
      boolean getNull​(int columnIndex)
      Check whether a column is NULL and update the 'wasNull' status.
      <T> T getValue​(int columnIndex, ValueFactory<T> vf)
      Retrieve a value for the given column.
      default void setBytes​(int columnIndex, byte[] value)
      Sets the given byte array as a raw column value (only works currently with ByteArrayRow).
      default Row setMetadata​(ColumnDefinition columnDefinition)
      Set metadata to enable getValue functionality.
      boolean wasNull()
      Was the last value retrieved a NULL value?

    • 方法详细资料

      • getValue

        <T> T getValue​(int columnIndex,
               ValueFactory<T> vf)
        Retrieve a value for the given column. This is the main facility to access values from the Row involving ValueDecoder and ValueFactory chain. Metadata must be set via Row constructor or setMetadata(ColumnDefinition) call before calling this method to allow correct columnIndex boundaries check and data type recognition.
        类型参数:
        T - type to decode to
        参数:
        columnIndex - index of column to retrieve value from (0-indexed, not JDBC 1-indexed)
        vf - value factory used to create the return value after decoding
        返回:
        The return value from the value factory

      • getBytes

        default byte[] getBytes​(int columnIndex)
        Returns the value at the given column as a byte array. The bytes represent the raw values returned by the server.
        参数:
        columnIndex - index of column (starting at 0) to return from.
        返回:
        the value for the given column; if the value is SQL NULL, the value returned is null

      • setBytes

        default void setBytes​(int columnIndex,
                      byte[] value)
        Sets the given byte array as a raw column value (only works currently with ByteArrayRow).
        参数:
        columnIndex - index of the column (starting at 0) to set to.
        value - the (raw) value to set

      • getNull

        boolean getNull​(int columnIndex)
        Check whether a column is NULL and update the 'wasNull' status.
        参数:
        columnIndex - of the column value (starting at 0) to check.
        返回:
        true if the column value is NULL, false if not.

      • wasNull

        boolean wasNull()
        Was the last value retrieved a NULL value?
        返回:
        true if the last retrieved value was NULL.