Prepared statement

[wwwjfy]

What do these changes do?

Implement MySQL Prepared Statements

Are there changes in behavior for the user?

No change to existing features.

Related issue number

Checklist

• I think the code is well written
• Unit tests for the changes exist
• Documentation reflects the changes
• Add a new news fragment into the CHANGES folder
  • name it <issue_id>.<type> (e.g. 588.bugfix)
  • if you don't have an issue_id change it to the pr id after creating the PR
  • ensure type is one of the following:
    • .feature: Signifying a new feature.
    • .bugfix: Signifying a bug fix.
    • .doc: Signifying a documentation improvement.
    • .removal: Signifying a deprecation or removal of public API.
    • .misc: A ticket has been closed, but it is not of interest to users.
  • Make sure to use full sentences with correct case and punctuation, for example: Fix issue with non-ascii contents in doctest text files.

[lgtm-com]

This pull request fixes 1 alert when merging e1e6621 into d842ec3 - view on LGTM.com

fixed alerts:

• 1 for Module-level cyclic import

[lgtm-com]

This pull request fixes 1 alert when merging f6ca5f9 into d842ec3 - view on LGTM.com

fixed alerts:

• 1 for Module-level cyclic import

[codecov]

Codecov Report

Merging #508 (e352475) into master (d842ec3) will decrease coverage by 5.05%.
The diff coverage is 74.63%.

@@            Coverage Diff             @@
##           master     #508      +/-   ##
==========================================
- Coverage   87.54%   82.48%   -5.06%     
==========================================
  Files           9       13       +4     
  Lines        1228     2312    +1084     
  Branches      177      357     +180     
==========================================
+ Hits         1075     1907     +832     
- Misses        124      316     +192     
- Partials       29       89      +60     

Impacted Files	Coverage Δ
aiomysql/prepared_statement.py	72.41% <72.41%> (ø)
aiomysql/utils.py	87.15% <85.71%> (-0.22%)	⬇️
aiomysql/connection.py	77.45% <86.20%> (ø)
aiomysql/cursors.py	92.55% <100.00%> (ø)
aiomysql/sa/__init__.py	100.00% <0.00%> (ø)
aiomysql/__init__.py	100.00% <0.00%> (ø)

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[lgtm-com]

This pull request fixes 1 alert when merging 20a439f into d842ec3 - view on LGTM.com

fixed alerts:

• 1 for Module-level cyclic import

[lgtm-com]

This pull request fixes 1 alert when merging c9f603a into d842ec3 - view on LGTM.com

fixed alerts:

• 1 for Module-level cyclic import

[wwwjfy]

Tests failed because of JSON is not supported in MariaDB 5.5
It is no longer supported officially. Can we drop it in Travis?

[lgtm-com]

This pull request fixes 1 alert when merging e352475 into d842ec3 - view on LGTM.com

fixed alerts:

• 1 for Module-level cyclic import

[Nothing4You]

Thank you for the PR, unfortunately due to aiomysql being based on PyMySQL this should first be implemented in PyMySQL and then ported to aiomysql.

see PyMySQL/PyMySQL#202 for the related issue in PyMySQL.