Question

目前我正在使用以下代码搜索整个表格中的单词

    Dim searchKey As String = "Sample"
    Dim mysql As String = "SELECT * FROM myTable " & _
                          "WHERE col1 LIKE '%" & searchKey & "%' " & _
                          " OR col2 LIKE '%" & searchKey & "%' " & _
                          " OR col3 LIKE '%" & searchKey & "%' " & _
                          " OR col4 LIKE '%" & searchKey & "%' "

但当列数增加时，查询变得更加困难。所以任何人都可以建议我做一些替代方法。

Answer 1

使用循环以编程方式构建String。在此示例中，您只需要将列添加到数组中。

Dim searchKey As String = "Sample"
Dim array() As String = {"col1", "col2", "col3", "col4"}
Dim b As Boolean = True

Dim mysql As String = "SELECT * FROM myTable WHERE "

For Each str As String In array
    If b Then
        mysql = mysql & str + " LIKE '%" & searchKey & "%'"
    Else
        mysql = mysql & " OR " & str & " LIKE '%" & searchKey & "%'"
    End If
    b = False

Next

Debug.WriteLine(mysql)

输出＆GT;＆GT;

SELECT * FROM myTable WHERE col1 LIKE '%Sample%' OR col2 LIKE '%Sample%' OR col3 LIKE '%Sample%' OR col4 LIKE '%Sample%'

Answer 2

您还可以获取MySQL提供的全文搜索帮助。此链接提供有关全文搜索的详细信息，http://dev.mysql.com/doc/refman/5.0/en/fulltext-natural-language.html

Answer 3

您可以这样做，如果表格结构发生变化，您需要在查询中添加/删除列。

SELECT * FROM myTable WHERE Concat(col1, '',col2, '', coln) LIKE '%searchKey%'

在整个表中搜索一个单词 - MySQL

3 个答案: