Why Isn't My SQLMock Query Matching?

Troubleshooting SQLMock Query Matching Issues

When using SQLMock to mock queries, you may encounter situations where the query you expect to be matched doesn't get matched, despite appearing identical in the log output. This article will discuss common reasons for this mismatch and provide solutions.

Why Isn't Query Matching?

The first step is to verify that your query is indeed identical to the expected query. However, subtle differences in syntax or argument handling can cause mismatches.

Solution: Regexp.QuoteMeta()

One common issue arises when using special characters in the query. SQLMock may interpret these characters differently than your code. To ensure an exact match, you can use the regexp.QuoteMeta() function to escape the query string. For example:

mock.ExpectQuery(regexp.QuoteMeta(`SELECT * FROM "storage_pools" WHERE "storage_pools"."deleted_at" IS NULL AND ((poolid = ?)) ORDER BY "storage_pools"."id" ASC LIMIT 1`))

This ensures that all special characters are treated as literals, preventing mismatches.

Intermittent Mismatches with Select Statements

You mentioned that select statements were not working with ExpectExec(). This is because ExpectExec() expects an update or insert statement, not a select statement. For select statements, use ExpectQuery() instead.

mock.ExpectQuery(`SELECT \* FROM "storage_pools"`).
    WithArgs(c.givenPool.PoolId).WillReturnResult(sqlmock.NewResult(1, 1))

Additional Considerations

• Make sure the arguments you are passing to the ExpectQuery() or ExpectExec() method match the arguments in the actual query.
• Check that the SQLMock configuration options, such as QueryMatcherOption, are set correctly.
• If you encounter intermittent mismatches, try using a different SQLMock configuration option for the query matcher, such as sqlmock.QueryMatcherEqual.

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