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query.go
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query.go
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package gocqltable
import (
"reflect"
"strings"
"github.com/gocql/gocql"
r "github.com/kristoiv/gocqltable/reflect"
)
type Query struct {
Statement string
Values []interface{}
Table Table
Session *gocql.Session
}
func (q Query) FetchRow() (interface{}, error) {
iter := q.Fetch()
row := iter.Next()
if err := iter.Close(); err != nil {
return nil, err
}
if row == nil {
return nil, gocql.ErrNotFound
}
return row, nil
}
func (q Query) Fetch() *Iterator {
iter := q.Session.Query(q.Statement, q.Values...).Iter()
return &Iterator{
iter: iter,
row: q.Table.Row(),
}
}
func (q Query) Exec() error {
return q.Session.Query(q.Statement, q.Values...).Exec()
}
type Iterator struct {
iter *gocql.Iter
row interface{}
done chan bool
}
func (i *Iterator) Next() interface{} {
m := make(map[string]interface{})
if i.iter.MapScan(m) == false {
return nil
}
t := reflect.TypeOf(i.row)
v := reflect.New(t)
r.MapToStruct(m, v.Interface())
r.MapToStruct(ucfirstKeys(m), v.Interface())
return v.Interface()
}
func (i *Iterator) Range() <-chan interface{} {
rangeChan := make(chan interface{})
done := make(chan bool)
i.done = done
go func() {
for {
next := i.Next()
if next == nil { // We clean up when we're done
close(rangeChan)
return
}
select {
case <-done: // We clean up when we're done
close(rangeChan)
return
case rangeChan <- next:
}
}
}()
return rangeChan
}
func (i *Iterator) Close() error {
if done := i.done; done != nil {
close(i.done)
i.done = nil
}
return i.iter.Close()
}
func ucfirst(s string) string {
if len(s) < 2 {
return strings.ToUpper(s)
}
return strings.ToUpper(s[0:1]) + s[1:]
}
func ucfirstKeys(s map[string]interface{}) map[string]interface{} {
result := make(map[string]interface{})
for key, value := range s {
result[ucfirst(key)] = value
}
return result
}