Home Database Mysql Tutorial MSSQL数据库获取TEXT字段的内容长度

MSSQL数据库获取TEXT字段的内容长度

Jun 07, 2016 pm 05:54 PM
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SQL Server数据库如何获取TEXT字段的内容长度呢?本文我们就来介绍一下

SQL Server数据库如何获取TEXT字段的内容长度的方法,是通过DATALENGTH函数来实现的,接下来我们就通过DATALENGTH函数的语法及使用实例来了解一下这部分内容。

DATALENGTH用来返回任何表达式所占用的字节数。

语法:DATALENGTH ( expression )

参数:expression,任何类型的表达式。

返回类型:int

注释:DATALENGTH 对 varchar、varbinary、text、image、nvarchar 和 ntext
数据类型特别有用,因为这些数据类型可以存储可变长度数据。NULL 的DATALENGTH 的结果是 NULL

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返回字符表达式中的字符数。如果字符串中包含前导空格和尾随空格,则函数会将它们包含在计数内。LEN 对相同的单字节和双字节字符串返回相同的值。

LEN(character_expression),字符串类型的表达式

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