本文整理汇总了Golang中dna.IntArray.Map方法的典型用法代码示例。如果您正苦于以下问题：Golang IntArray.Map方法的具体用法？Golang IntArray.Map怎么用？Golang IntArray.Map使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类dna.IntArray的用法示例。
在下文中一共展示了IntArray.Map方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Golang代码示例。
示例1: SelectMissingIds
// SelectMissingIds accepts a table name as an input and a list of ids as a source.
// It returns a new list of ids that does not exist in the destination table
//
// * tblName : a table name
// * srcIds : a source ids
// * db : a pointer to connected databased
// * Returns a new list of ids which are not from the specified table
//
// The format of sql statement is:
// WITH dna (id) AS (VALUES (5),(6),(7),(8),(9))
// SELECT id FROM dna WHERE NOT EXISTS
// (SELECT 1 from ziartists WHERE id=dna.id)
func SelectMissingIds(tblName dna.String, srcIds *dna.IntArray, db *sqlpg.DB) (*dna.IntArray, error) {
if srcIds.Length() > 0 {
val := dna.StringArray(srcIds.Map(func(val dna.Int, idx dna.Int) dna.String {
return "(" + val.ToString() + ")"
}).([]dna.String))
selectStmt := "with dna (id) as (values " + val.Join(",") + ") \n"
selectStmt += "SELECT id FROM dna WHERE NOT EXISTS\n (SELECT 1 from " + tblName + " WHERE id=dna.id)"
ids := &[]dna.Int{}
err := db.Select(ids, selectStmt)
switch {
case err != nil:
return nil, err
case err == nil && ids != nil:
slice := dna.IntArray(*ids)
return &slice, nil
case err == nil && ids == nil:
return &dna.IntArray{}, nil
default:
panic("Default case triggered. Case is not expected. Cannot select non existed ids")
}
} else {
return nil, errors.New("Empty input array")
}
}