How to Handle Slice Arguments in lib/pq SQL Queries?

Parameter Conversion Error: Slices Unsupported in Query

When using lib/pq to execute SQL queries, it's important to ensure that parameter types are supported. In one instance, the following code encountered an error:

somevars := []int{1, 2, 3, 4}
rows, err = db.Query("SELECT c1,c2 FROM table"+tid+" WHERE c1 IN(,,,);", somevars)

The error message indicated: "sql: converting argument $1 type: unsupported type []int, a slice of int". This error highlights that lib/pq cannot directly handle slices as arguments.

Solution: Using pq.Array

To resolve this issue, pq.Array can be utilized. This function converts a Go slice into a Postgres ARRAY, which is then recognized by the query.

The modified code below demonstrates this:

somevars := []int{1, 2, 3, 4}
rows, err = db.Query("SELECT c1,c2 FROM table"+tid+" WHERE c1 = any();", pq.Array(somevars))

By using pq.Array, the slice is transformed into an ARRAY, enabling it to be used as a valid argument in the query. This allows for seamless execution of queries with slice arguments.

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