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Diffstat (limited to 'docs/ref/models/querysets.txt')
| -rw-r--r-- | docs/ref/models/querysets.txt | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/docs/ref/models/querysets.txt b/docs/ref/models/querysets.txt index 022a251e5c..2decddbc28 100644 --- a/docs/ref/models/querysets.txt +++ b/docs/ref/models/querysets.txt @@ -1041,6 +1041,16 @@ of the arguments is required, but you should use at least one of them. Entry.objects.extra(where=['headline=%s'], params=['Lennon']) +.. warning:: + + If you are performing queries on MySQL, note that MySQL's silent type coercion + may cause unexpected results when mixing types. If you query on a string + type column, but with an integer value, MySQL will coerce the types of all values + in the table to an integer before performing the comparison. For example, if your + table contains the values ``'abc'``, ``'def'`` and you query for ``WHERE mycolumn=0``, + both rows will match. To prevent this, perform the correct typecasting + before using the value in a query. + defer ~~~~~ |