动态SQL使用JDBC和MySQL在Google Apps脚本上返回“语法错误" [英] Dynamic SQL returns 'syntax error' on Google Apps Script using JDBC and MySQL
问题描述
我正在电子表格项目中使用Google Apps脚本,并使用JDBC连接到MySQL数据库.我正在尝试运行以下功能,该功能应该从我的数据库返回一些数据:
I'm using Google Apps Scripts inside a Spreadsheet project, connecting to a MySQL DB using JDBC. I'm trying to run the following function, which is supposed to return some data from my DB:
function selectAllUserSurveys() {
var query = "SET @sql = NULL; \
SELECT GROUP_CONCAT(DISTINCT \
CONCAT('MAX(CASE WHEN survey_field_values.survey_field_option_id = ', survey_field_option_id, \
' THEN survey_field_values.value END) AS ', CONCAT('`survey_field_option_id', survey_field_option_id, '`')) \
) INTO @sql \
FROM survey_field_values \
LEFT JOIN surveys \
ON survey_field_values.survey_id = surveys.id \
WHERE surveys.survey_type = 'client'; \
SET @sql = CONCAT('SELECT surveys.bid_id, user.rep_name, 0, ', @sql, ' \
FROM surveys \
INNER JOIN user \
ON surveys.user_id = user.username \
LEFT JOIN survey_field_values \
ON surveys.id = survey_field_values.survey_id \
WHERE surveys.survey_type = \'client\' \
AND surveys.is_filled = 1 \
GROUP BY surveys.id \
ORDER BY surveys.date_filled ASC'); \
PREPARE stmt FROM @sql; \
EXECUTE stmt; \
DEALLOCATE PREPARE stmt;";
return executeSelectMultipleRowsQuery(query);
}
function executeSelectMultipleRowsQuery(query) {
var conn = Jdbc.getConnection(dbUrl, user, userPwd);
var start = new Date();
var stmt = conn.createStatement();
var results = stmt.executeQuery(query);
var numCols = results.getMetaData().getColumnCount();
return results;
results.close();
stmt.close();
}
通过Google Apps脚本运行查询时,出现以下错误:
When running the query through Google Apps Script, I get the following error:
您的SQL语法有错误;在第1行的'SELECT GROUP_CONCAT(DISTINCT CONCAT('MAX(CASE WHEN survey_field_values.survey_fi''
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 GROUP_CONCAT(DISTINCT CONCAT('MAX(CASE WHEN survey_field_values.survey_fi' at line 1
但是,直接通过MySQL
控制台运行查询不会返回错误,而是返回正确的数据.
However, running the query directly through the MySQL
console does not return an error, and the correct data is returned.
我感觉我缺少分隔符,但是不太清楚它是什么.
I have a feeling I'm missing something with the delimiters, but not quite sure what it is.
/EDIT/
根据Marc的建议,我对代码进行了重组,以在单独的查询中运行每个语句.这是更新的项目:
Using Marc's advice, I've restructure the code to run each statement in a separate query. Here's the updated project:
function selectAllUserSurveys() {
dbHelper = new DBHelper();
var setsql = "SET @sql = NULL";
dbHelper.executeSelectMultipleRowsQuery(setsql);
var dynamicColumns = "SELECT GROUP_CONCAT(DISTINCT \
CONCAT('MAX(CASE WHEN survey_field_values.survey_field_option_id = ', survey_field_option_id, \
' THEN survey_field_values.value END) AS ', CONCAT('`survey_field_option_id', survey_field_option_id, '`')) \
) INTO @sql \
FROM survey_field_values \
LEFT JOIN surveys \
ON survey_field_values.survey_id = surveys.id \
WHERE surveys.survey_type = 'client'";
Logger.log(dbHelper.executeSelectMultipleRowsQuery(dynamicColumns));
var mainquery = "SET @sql = CONCAT('SELECT surveys.bid_id, user.rep_name, 0, ', @sql, ' \
FROM surveys \
INNER JOIN user \
ON surveys.user_id = user.username \
LEFT JOIN survey_field_values \
ON surveys.id = survey_field_values.survey_id \
WHERE surveys.survey_type = \\'client\\' \
AND surveys.is_filled = 1 \
GROUP BY surveys.id \
ORDER BY surveys.date_filled ASC')"
dbHelper.executeSelectMultipleRowsQuery(mainquery);
var prepare = "PREPARE stmt FROM @sql";
dbHelper.executeSelectMultipleRowsQuery(prepare);
var execute = "EXECUTE stmt";
var return_value = dbHelper.executeSelectMultipleRowsQuery(execute);
var deallocate = "DEALLOCATE PREPARE stmt;";
dbHelper.executeSelectMultipleRowsQuery(deallocate);
Logger.log(return_value);
return return_Value;
}
function DBHelper() {
this.conn = Jdbc.getConnection(dbUrl, user, userPwd);
this.stmt = this.conn.createStatement();
}
DBHelper.prototype.executeSelectMultipleRowsQuery = function(query) {
var results = this.stmt.executeQuery(query);
var numCols = results.getMetaData().getColumnCount();
return results;
}
到达此行:dbHelper.executeSelectMultipleRowsQuery(prepare);
时,我现在收到以下错误,这几乎意味着@sql
变量将在每个查询上重置:
When reaching this line: dbHelper.executeSelectMultipleRowsQuery(prepare);
, I now recieve the following error, which pretty much means the @sql
variable is reset on each query:
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 'NULL' at line 1
推荐答案
解决方案的确像Marc B所述,我的编辑显示了什么.也就是说,创建单个连接并执行多个SQL选择,而不是在同一执行上运行两个选择.
The solution was indeed like Marc B described, and what my edit shows. That is, creating a single connection, and executing multiple SQL selects instead of running two selects on the same execution.
这篇关于动态SQL使用JDBC和MySQL在Google Apps脚本上返回“语法错误"的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!