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Support scalar queries.#1126
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query_one considers it an error for the query to return more than one row. Should the scalar methods consider it an error for the query to return more than one column?
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This PR adds support for querying scalars with the following functions:
query_scalarreturns a vector of scalarsquery_one_scalarreturns one scalarquery_opt_scalarreturns optional scalarIt removes the need to always handle a row.
Also in the process of migrating from
sqlxtotokio-postgresit's convenient to have support for scalar query functions.Questions and/or suggestions are welcome!