SQL 合并 LIKE & AND & =

Question

var getData = "SELECT * FROM Test WHERE exercise = " + exercise + " AND exerVariName LIKE '[A-Z]%' AND date >= '" + fromDate + "' AND date <= '" + toDate + "'";

我似乎无法弄清楚为什么这一行中的 LIKE 部分不起作用！我在 w3schools 上发现，如果您想要该列中的所有值，您可以执行 LIKE '[a-z]%'。但它不起作用。我没有收到任何错误，但我也没有收到任何结果！

当我不想要所有但特定的 (exerVariName) 时，我有第二行，这个行。（我通过下拉菜单选择一个特定的或 'All'。）

var getDataS = "SELECT * FROM Test WHERE exercise = " + exercise + " AND exerVariName = '" + exerVariName + "' AND date >= '" + fromDate + "' AND date <= '" + toDate + "'";

更新！

我想从数据库中写出一些数据以供查看，所以我 select 'exercise' 使用单选按钮，'exerVariName' 使用下拉菜单， 'fromDate/toDate' 使用一个文本框！

<div>
    <select name="exerVariName">
        <option value="all">All</option>
        @foreach (var get in db.Query(getVariName)) {
            <option value="@get.exerVariName">@get.exerVariName</option> 
        }
    </select>
</div>

所以我从数据库中获取了 select 选项数据，除了第一个我用 "all" 作为值放在那里的选项数据。

然后我有这段代码：（thisData放在foreach中）

var thisData = "";

if  (exerVariName == "all") {
    thisData = getData;
} else {
    thisData = getDataS;
}

因此，如果 select-option-dropdown 值是 "all" 一个，thisData = getData 就是这个带 LIKE 的，这一行的重点是选择来自数据库的列，这就是我选择所有字母 (a-z) 的原因。

var getData = "SELECT * FROM Test WHERE exercise = " + exercise + " AND exerVariName LIKE '[A-Z]%' AND date >= '" + fromDate + "' AND date <= '" + toDate + "'";

如果我 select 下拉列表中的特定内容，它将转到 if 语句的 ELSE 部分并使用此行

var getDataS = "SELECT * FROM Test WHERE exercise = " + exercise + " AND exerVariName = '" + exerVariName + "' AND date >= '" + fromDate + "' AND date <= '" + toDate + "'";

如果您需要更多信息，请告诉我！

Answer 1

试试这个

var getData = "SELECT * FROM Test WHERE exercise = " + exercise + " AND exerVariName NOT LIKE '%[^A-Z]%' AND date >= '" + fromDate + "' AND date <= '" + toDate + "'";

Answer 2

如果你想得到所有的测试基础，那么请使用这样的

var getData = "SELECT * FROM Test WHERE exercise = " + exercise + " AND exerVariName LIKE '%' AND date >= '" + fromDate + "' AND date <= '" + toDate + "'";

Answer 3

the point of this line is to choose everything in the column from the database which is why I choose all the letters (a-z).

var getData = "SELECT * FROM Test WHERE exercise = " + exercise + " AND exerVariName LIKE '[A-Z]%' AND date >= '" + fromDate + "' AND date <= '" + toDate + "'";

我觉得你想多了。如果你想要一切（即在列上没有过滤器）然后完全省略子句上的 part/filter。

"SELECT * FROM Test WHERE exercise = " + exercise + " AND date >= '" + fromDate + "' AND date <= '" + toDate + "'";

最后，这很容易受到 sql 注入攻击，您应该使用参数化语句而不是字符串连接。如果您使用该语言更新您的问题，我可能能够获得该语言的参数化查询示例。

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