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Showing content from https://sidorares.github.io/node-mysql2/docs/documentation/prepared-statements below:

Prepared Statements | Quickstart

Similar to connection.query().

connection.execute('select 1 + ? + ? as result', [5, 6], (err, rows) => {
  
  
});


connection.unprepare('select 1 + ? + ? as result');

Note that connection.execute() will cache the prepared statement for better performance, remove the cache with connection.unprepare() when you're done.

Manually prepared statements doesn't comes with LRU cache and SHOULD be closed using statement.close() instead of connection.unprepare().

connection.prepare('select ? + ? as tests', (err, statement) => {
  
  
  
  

  statement.execute([1, 2], (err, rows, columns) => {
    
  });

  
  
  statement.close();
});

Note that you should not use statement after connection reset (changeUser() or disconnect). Statement scope is connection, you need to prepare statement for each new connection in order to use it.

maxPreparedStatements : We keep the cached statements in a lru-cache. Default size is 16000 but you can use this option to override it. Any statements that are dropped from cache will be closed.

The bind parameter values passed to execute are serialized JS -> MySQL as:

• null -> NULL
• number -> DOUBLE
• boolean -> TINY (0 for false, 1 for true)
• object -> depending on prototype:
  • Date -> DATETIME
  • JSON like object - JSON
  • Buffer -> VAR_STRING
• Other -> VAR_STRING

Passing in undefined or a function will result in an error.

MySQL2 provides execute helper which will prepare and query the statement. You can also manually prepare / unprepare statement with prepare / unprepare methods.

connection.execute(
  'select ?+1 as qqq, ? as rrr, ? as yyy',
  [1, null, 3],
  (err, rows, fields) => {
    console.log(err, rows, fields);
    connection.execute(
      'select ?+1 as qqq, ? as rrr, ? as yyy',
      [3, null, 3],
      (err, rows, fields) => {
        console.log(err, rows, fields);
        connection.unprepare('select ?+1 as qqq, ? as rrr, ? as yyy');
        connection.execute(
          'select ?+1 as qqq, ? as rrr, ? as yyy',
          [3, null, 3],
          (err, rows, fields) => {
            console.log(err, rows, fields);
          }
        );
      }
    );
  }
);

For Prepared Statements examples, please see here.

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