在data type域中双击右键，并从下拉列表中进行选择，指定各个列的数据类型。

Specify the data types of the columns by double clicking in the data type field and selecting from the drop down list.

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如果列的数据类型可以更改，则兼容数据类型的列表在每个列的数据类型下拉列表中自动列出。

In cases where the data type of a column can be altered, the list of compatible data types is automatically listed in the data type drop down for each column.

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在 J2C 用户界面上可以很容易地确定一些属性，您可以在下拉列表中看到一列可能的值。

Some of the properties can be easily identified from the J2C UI, and you can view the list of possible values in a drop-down list.

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