MySQL 错误 1064 : search query not working as expected

Question

我正在尝试编写用于搜索表的查询，但我收到了一般的 1064 MySQL 语法错误。我没有发现我的查询有任何问题......事实上，我有另一个查询就像它一样工作正常。

查询使用 Go 中的 SQL 驱动程序，所有 ? 都将在查询运行之前转换为值。

这是我的错误:

Error 1064: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'SELECT tax.* FROM tax JOIN user_tax ON user_tax.tax_id = tax.id WHERE u' at line 3

例如，这是工作查询:

SELECT tax.*
FROM tax
JOIN user_tax
    ON user_tax.tax_id = tax.id
WHERE user_tax.user_id = ?
    AND tax.deleted_at IS NULL
    AND user_tax.deleted_at IS NULL

上面的查询将查找给定用户的所有税务记录。

现在我正在尝试进行完全相同的查询，只是现在它是一个“搜索”查询。它接受一个搜索字符串，并在税表的 name 和 rate 列中查找它。就是这样:

SET @searchString = '%?%';

SELECT tax.*
FROM tax
JOIN user_tax
    ON user_tax.tax_id = tax.id
WHERE user_tax.user_id = ?
    AND tax.deleted_at IS NULL
    AND user_tax.deleted_at IS NULL
    AND tax.name LIKE @searchString
        OR tax.rate LIKE @searchString

这是代码中的查询:

var taxes []Tax
err := r.db.Select(&taxes, `
    SET @query = '%?%';

    SELECT tax.*
    FROM tax
    JOIN user_tax
        ON user_tax.tax_id = tax.id
    WHERE user_tax.user_id = ?
        AND tax.deleted_at IS NULL
        AND user_tax.deleted_at IS NULL
        AND tax.name LIKE @query
            OR tax.rate LIKE @query
`, q, userId)

Answer 1

如果你想避免多次绑定(bind)相同的值，你可以在交叉连接子查询中绑定(bind)一次并重用该值:

SELECT tax.*
FROM tax
JOIN user_tax
    ON user_tax.tax_id = tax.id
CROSS JOIN (SELECT ? as q) sub
WHERE user_tax.user_id = ?
    AND tax.deleted_at IS NULL
    AND user_tax.deleted_at IS NULL
    AND (tax.name LIKE sub.q
         OR tax.rate LIKE sub.q)

现在只需绑定(bind) %s% 作为第一个参数。