How to Query MySQL with sqlx Using a Slice of Values?

Querying MySQL with sqlx and a slice of values

When querying a database table to retrieve data based on values contained in a slice, users may encounter errors like the one shown below:

sql: converting Exec argument #0's type: unsupported type []int, a slice
quotes []

This error indicates that the query is expecting a specific type for the input parameter, but instead, it receives a slice, which is not a supported type.

To resolve this issue, sqlx provides a convenient helper function called In(). This function takes the slice of values and the query string as arguments and returns a modified query with the ? bindvar. This query can then be rebound to the appropriate database backend using the Rebind() method.

Here's an example of how to use In():

var qids []int

// fills qids on query dynamically
query, args, err := sqlx.In("SELECT * FROM quote WHERE qid IN (?)", qids)
if err != nil {
    log.Fatal(err)
}

// sqlx.In returns queries with the `?` bindvar, we can rebind it for our backend
//
query = database.SQL.Rebind(query)  // database.SQL should be a *sqlx.DB

err = database.SQL.Select(&quotes, query, args...)
if err != nil {
    log.Fatal(err)
}

The above code retrieves the values from the 'quote' table where the 'qid' field matches any of the values in the qids slice.

For further reference and examples, visit the official sqlx documentation at http://jmoiron.github.io/sqlx/.

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