where子句中的Javascript SQL请求错误字段错误

Question

仅当没有相同的电子邮件大于当前分数的电子邮件没有分数时，该代码才应更新分数，而是显示错误：

Error: Error: ER_BAD_FIELD_ERROR: Unknown column 'li' in 'where clause'

function postScores(useremail, username, scoreValue, leaderboardName) {
    if (leaderboardName === "GHOSTS" || leaderboardName === "PACMAN" || leaderboardName === "OVERALL") {
        connection.query('UPDATE SCORES_' + leaderboardName + ' SET SCORES=' + scoreValue + ' WHERE SCORES < ' + scoreValue + ' AND USER_EMAIL=' + useremail,
            function(err, rows, fields) {
                if (err) {
                    console.log("Failed to Update. Attempting to Insert.");
                    console.log("Error: " + err);
                    connection.query(
                        'INSERT INTO SCORES_' + leaderboardName + '(USER_EMAIL, USER_NAME, SCORES) VALUES (?,?,?)', [
                            useremail, username, scoreValue
                        ],
                        function(err, rows, fields) {
                            if (err) {
                                console.log("Total Failure. Systems down");
                            } else {
                                console.log("Success. Inserted new Scores");
                            }
                        });
                }
            });
    } else {
        // Reference to Non-Existent Leaderboard
        return console.log('Specified Leaderboard of the name ' + leaderboardName + ' does not Exist');
    }
}

Answer 1

在UPDATE查询中，不要将原始数据连接到值中，不要使用占位符，并以与INSERT查询相同的方式为值传递数组。

未加引号的字符串值可能会导致SQL语法错误。 通过使用占位符，您不需要处理值中的引号。

connection.query('UPDATE SCORES_' + leaderboardName + ' SET SCORES = ? WHERE SCORES < ? AND USER_EMAIL = ?',
    [scoreValue, scoreValue, useremail],
    function (err, rows, fields) {