Columns that allow null values ; zero - length strings are returned if the columns are not nullable 列返回空值；如果列不能为空，则返回零长度的字符串。
Object to zero and its string properties to zero - length strings . without the call to clear 对象的数字属性重置为零，并将其字符串属性重置为零长度字符串。
Is a zero - length string , contains only white space , or contains one or more invalid characters as defined by 是一个零长度字符串，仅包含空白或者包含一个或多个由
Is a zero - length string , contains only white space , or contains one or more of the invalid characters defined in 是一个零长度字符串，仅包含空白、包含一个或多个由
A zero - length string or binary value used as the definition of a computed table column creates a column of type 用作计算表列定义的零长度字符串或二进制值可创建类型为
A zero - length string or binary value that is used as the definition of a computed table column creates a column of type 用作计算表列定义的零长度字符串或二进制值可创建类型为
Parameter is a zero - length string , contains only white space , or contains one or more invalid characters as defined by 参数是一个零长度的字符串，仅包含空白、或包含一个或多个由
A memory location is either an object of scalar type , or a maximal sequence of adjacent bit - fields all having non - zero width 一个内存位置要么是一个标量、要么是一组紧邻的具有非零长度的位域。
Note : not all databases support zero - length strings and may cause an error when a record with blank fields is added 注意：并不是所有的数据库都支持“零长度字符串（ " " ） ”的；当添加一个空的字符时，可能会出现错误。
