For each non-NULL variable-length field, the record header contains the length of the column in one or two bytes.
对于每个非空的变长字段，记录头使用一或两个字节包含了列的长度。
A field in which the number of the characters can be changed. A variable-length field must contain a data area to indicate its end and length.
字符数量可变的一种字段，它必须包含一个数据域以指示字段的终止及长度。
Indicates how to interpret the variable length type field. Valid values are described in described in Table 1.
指明了如何解析可变长度字段，有效值被描述在表1。
Indicates how to interpret the variable length type field. Valid values are described in described in Table 1.
指明了如何解析可变长度字段，有效值被描述在表1。
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