[SOLVED] mysql2/promise: INSERT statement not valid in transaction query

mysql2/promise: INSERT statement not valid in transaction query

Thanks for your time. I'm having trouble with creating a transaction query using the mysql2/promise package.

Here's the query:

    await db.execute(`START TRANSACTION`);
    await db.execute(`INSERT INTO user VALUES (?, ?, ?, ?, ?, ?)`, [...userDetails]);
    await db.execute(`INSERT INTO account VALUES (?, ?, ?, ?, ?, ?)`, [...accountDetails]);
    await db.execute(`COMMIT`);

And here's the error I get:

Error: This command is not supported in the prepared statement protocol yet
code: 'ER_UNSUPPORTED_PS',
  errno: 1295,
  sql: 'START TRANSACTION',
  sqlState: 'HY000',
  sqlMessage: 'This command is not supported in the prepared statement protocol yet'

I'm wondering if has something to do with my querying? I believe INSERT statements should be perfectly fine in a transaction block. I've also tried combining each query into one string, but that doesn't seem to work either.

Solution

MySQL limits which statements can be done in prepared statements, start transaction is not allowed. See SQL Syntax Allowed In Prepared Statements and here is a demonstration.

execute is always using and caching prepared statements. This is good if the query is complex (MySQL doesn't have to parse it every time) or takes arguments (for security).

However, if your query is simple and does not take any arguments there's no need to prepare it. Use query which just runs the SQL. This both avoids the error you're getting, and it avoids filling up the prepared statement cache.

    await db.query(`START TRANSACTION`);
    await db.execute(`INSERT INTO user VALUES (?, ?, ?, ?, ?, ?)`, [...userDetails]);
    await db.execute(`INSERT INTO account VALUES (?, ?, ?, ?, ?, ?)`, [...accountDetails]);
    await db.query(`COMMIT`);