Postgres 更新导致错误“无法确定参数 $3 的数据类型”

Question

I have an issue with our golang programs when querying sql statement as below.

"database/sql"

sqlStatement := `
    UPDATE user_posts SET
        content = $2,
        post_image = CASE WHEN ($3 IS NULL) THEN post_image ELSE $3 END,
        updated_at = NOW()
    WHERE id = $1
`

Answer 1

Found the answers parameter $3 cannot compare with clause "IS NULL" fixed as below.

sqlStatement := `
    UPDATE user_posts SET
        content = $2,
        post_image = CASE WHEN $3 != '' THEN $3 ELSE post_image END,
        updated_at = NOW()
    WHERE id = $1
`