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collection.go
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collection.go
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package perse
import (
"strconv"
"container/list"
"strings"
)
type Operator int
const (
AND Operator = iota
OR
NOT
)
func (o *Operator) String() string {
switch *o {
case AND:
return " AND "
case OR:
return " OR "
case NOT:
return " NOT "
}
return ""
}
type Relation int
const (
EQ Relation = iota
NEQ
IN
LT
GT
BETWEEN
LIKE
)
type condatom struct {
fname string
fvalues []string
relation Relation
}
func (c *condatom) IsValid() (ok bool) {
if len(c.fname) < 1 {
return false
}
vallen := len(c.fvalues)
if vallen < 1 {
return false
}
switch c.relation {
case EQ, NEQ, LT, GT:
return vallen == 1
case IN:
return vallen >= 1
case BETWEEN:
return vallen == 2
}
return true
}
// returns sql WHERE clause
func (c *condatom) String() string {
switch c.relation {
case EQ:
return c.fname + " = " + c.fvalues[0]
case NEQ:
return c.fname + " <> " + c.fvalues[0]
case LT:
return c.fname + " < " + c.fvalues[0]
case GT:
return c.fname + " > " + c.fvalues[0]
case IN:
return c.fname + " IN " + c.fvalues[0]
case BETWEEN:
return c.fname + " BETWEEEN " + c.fvalues[0] + " AND " + c.fvalues[1]
case LIKE:
return c.fname + " LIKE " + c.fvalues[0]
}
return ""
}
func check(c *cond, nc Cond) bool {
if v, ok := nc.(*cond); ok {
//FIXME: panic?
return v != c
}
return true
}
type cond struct {
atos *list.List
}
func (c *cond) And(ncond Cond) Cond {
if check(c, ncond) {
c.atos.PushBack(AND)
c.atos.PushBack(ncond)
}
return c
}
func (c *cond) Or(ncond Cond) Cond {
if check(c, ncond) {
c.atos.PushBack(OR)
c.atos.PushBack(ncond)
}
return c
}
func (c *cond) Not() Cond {
c.atos.PushBack(NOT)
return c
}
func (c *cond) IsValid() bool {
//FIXME:
return true
}
func (c *cond) String() string {
result := ""
stckcnt := 0
for e := c.atos.Front(); e != nil; e = e.Next() {
switch v := e.Value.(type) {
case Operator:
if v == NOT {
result = v.String() + "(" + result + ")"
} else {
result += v.String() + "("
stckcnt++
}
case *condatom:
result += v.String()
if stckcnt > 0 {
result += ")"
stckcnt--
}
case Cond:
result += v.String()
if stckcnt > 0 {
result += ")"
stckcnt--
}
}
}
for ; stckcnt > 0; stckcnt-- {
result += " ) "
}
return result
}
//Conditions compares only field to concrete values
//There is no possibility to compare fields with each other, by now...
func NewCond(field string, r Relation, vals ...string) Cond {
l := list.New()
l.PushBack(&condatom{field, vals, r})
return &cond{l}
}
type CustomML struct {
name string
fields []string
values []string
}
func (cml *CustomML) RelName() string {
return cml.name
}
func (cml *CustomML) Fields() []string {
return cml.fields
}
func (cml *CustomML) SetValues(val ...string) {
cml.values = val
}
func (cml *CustomML) Map() map[string]string {
///
ret := make(map[string]string)
for i, v := range cml.fields {
ret[v] = cml.values[i]
}
return ret
}
type collection struct {
model ModelLike
conds Cond
order []string
limit int64
offset int64
}
func (c *collection) Filter(conds Cond) Collection {
c.conds = conds
return c
}
func (c *collection) Sort(fields ...string) Collection {
c.order = fields
return c
}
func (c *collection) Limit(limit int64) Collection {
c.limit = limit
return c
}
func (c *collection) Offset(offset int64) Collection {
c.offset = offset
return c
}
func (c *collection) Query(co ...Connection) Result {
conn := getConnection(co)
q := "SELECT " + strings.Join(c.model.Fields(), ",") + " FROM " + c.model.RelName()
cs := c.conds.String()
if len(cs) > 0 {
q += " WHERE " + c.conds.String()
}
if len(c.order) > 0 {
q += "ORDER BY " + strings.Join(c.order, ",")
}
if c.limit > 0 {
q += "LIMIT " + strconv.Itoa64(c.limit)
}
return conn.Query(&Stmt{c.model.Fields(), q})
}
func NewCollection(v interface{}, fields ...string) Collection {
var ml ModelLike
switch nv := v.(type) {
case ModelLike:
ml = nv
case string:
ml = &CustomML{nv, fields, nil}
default:
if IsModelValue(nv) {
name, _, mapa, _, _ := CrudInfo(v)
fields, _ := GetKVSlices(mapa, "", false)
ml = &CustomML{name, fields, nil}
} else {
return nil
}
}
c := &collection{ml, nil, nil, 0, 0}
return c
}