SQL 字符串连接在 SQLite 中不起作用
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String concatenation does not work in SQLite
提问by Ian Vink
I am trying to execute a SQlite replace function, but use another field in the function.
我正在尝试执行 SQlite 替换函数,但使用函数中的另一个字段。
select locationname + '<p>' from location;
In this snip, the result is a list of 0s. I would have expected a string with the text from locationname and the '<p>'
literals.
在这个片段中,结果是一个 0 列表。我本来希望有一个字符串,其中包含来自 locationname 和'<p>'
文字的文本。
回答by codaddict
Try using ||
in place of +
尝试使用||
代替+
select locationname || '<p>' from location;
From SQLite documentation:
来自SQLite 文档:
The || operator is "concatenate" - it joins together the two strings of its operands.
|| 运算符是“连接” - 它将其操作数的两个字符串连接在一起。
回答by shamittomar
The ||
operator is the concatenation in SQLite. Use this code:
该||
操作是在SQLite的级联。使用此代码:
select locationname || '<p>' from location;
回答by Brian Burns
For comparison,
为了比较,
SQLite || Oracle CONCAT(string1, string2) or || MySQL CONCAT(string1, string2, string3...) or || if PIPES_AS_CONCAT enabled Postgres CONCAT(string1, string2, string3...) or || Microsoft SQL Server 2012+ CONCAT(string1, string2, string3...) or + Microsoft Access +
回答by quickdraw
for Visual Studio 2010, using the Data Sources designer or wizard, you're in trouble using || operator. Create a view in the sqlite db and create your data source(s) from that.
对于 Visual Studio 2010,使用数据源设计器或向导,您在使用 || 时遇到了麻烦 操作员。在 sqlite 数据库中创建一个视图并从中创建您的数据源。
See also this thread.
另请参阅此线程。