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documentation addition :
It is recommended to activate the `trace` option in development
Since driver is asynchronous, enabling this option permits to save initial stack when calling any driver methods.
This allows to have interesting debugging information:
example:
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const pool = mariadb.createPool({
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host: 'mydb.com',
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user: 'myUser',
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connectionLimit: 5
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});
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await pool.query('wrong query');
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/* will throw an error like :
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SqlError: (conn=15868, no: 1064, SQLState: 42000) You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'wrong query' at line 1
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sql: wrong query - parameters:[]
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at Object.module.exports.createError (C:\temp\mariadb-connector-nodejs2\lib\misc\errors.js:57:10)
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at ...
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text: "You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'wrong query' at line 1",
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sql: 'wrong query - parameters:[]',
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fatal: false,
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errno: 1064,
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sqlState: '42000',
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code: 'ER_PARSE_ERROR'
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}*/
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Same example but with pool trace
const pool = mariadb.createPool({
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host: 'mydb.com',
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user: 'myUser',
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connectionLimit: 5,
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trace: true
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});
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await pool.query('wrong query');
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/* will throw an error like :
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sql: wrong query - parameters:[]
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at Object.module.exports.createError (C:\temp\mariadb-connector-nodejs2\lib\misc\errors.js:57:10)
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at ...
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From event:
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at Function._PARAM (C:\temp\mariadb-connector-nodejs2\lib\connection-promise.js:104:30)
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at PoolPromise.query (C:\temp\mariadb-connector-nodejs2\lib\pool-promise.js:102:40)
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at Context.<anonymous> (C:\temp\mariadb-connector-nodejs2\test\integration\test-pool.js:60:18)
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at callFn (C:\temp\mariadb-connector-nodejs2\node_modules\mocha\lib\runnable.js:366:21)
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at Test.Runnable.run (C:\temp\mariadb-connector-nodejs2\node_modules\mocha\lib\runnable.js:354:5)
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at Runner.runTest (C:\temp\mariadb-connector-nodejs2\node_modules\mocha\lib\runner.js:678:10)
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at C:\temp\mariadb-connector-nodejs2\node_modules\mocha\lib\runner.js:801:12
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at next (C:\temp\mariadb-connector-nodejs2\node_modules\mocha\lib\runner.js:593:14)
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at C:\temp\mariadb-connector-nodejs2\node_modules\mocha\lib\runner.js:603:7
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at next (C:\temp\mariadb-connector-nodejs2\node_modules\mocha\lib\runner.js:486:14)
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at Immediate.<anonymous> (C:\temp\mariadb-connector-nodejs2\node_modules\mocha\lib\runner.js:571:5)
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at processImmediate (internal/timers.js:464:21) {
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text: "You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'wrong query' at line 1",
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sql: 'wrong query - parameters:[]',
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fatal: false,
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errno: 1064,
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sqlState: '42000',
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code: 'ER_PARSE_ERROR'
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}
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*/
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The caller method and line are now in error stack, permitting error easy debugging.
The problem is this error stack is created using Error.captureStackTrace that is very very slow.
To give an idea, this slows down by 10% a query like 'select * from mysql.user LIMIT 1', so not recommended in production.
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