init orm project, beta, unstable

orm/models.go

@@ -0,0 +1,81 @@
+package orm
+
+import (
+	"log"
+	"os"
+	"sync"
+)
+
+const (
+	od_CASCADE           = "cascade"
+	od_SET_NULL          = "set_null"
+	od_SET_DEFAULT       = "set_default"
+	od_DO_NOTHING        = "do_nothing"
+	defaultStructTagName = "orm"
+)
+
+var (
+	errLog     *log.Logger
+	modelCache = &_modelCache{cache: make(map[string]*modelInfo)}
+	supportTag = map[string]int{
+		"null":         1,
+		"blank":        1,
+		"index":        1,
+		"unique":       1,
+		"pk":           1,
+		"auto":         1,
+		"auto_now":     1,
+		"auto_now_add": 1,
+		"max_length":   2,
+		"choices":      2,
+		"column":       2,
+		"default":      2,
+		"rel":          2,
+		"reverse":      2,
+		"rel_table":    2,
+		"rel_through":  2,
+		"digits":       2,
+		"decimals":     2,
+		"on_delete":    2,
+	}
+)
+
+func init() {
+	errLog = log.New(os.Stderr, "[ORM] ", log.Ldate|log.Ltime|log.Lshortfile)
+}
+
+type _modelCache struct {
+	sync.RWMutex
+	orders []string
+	cache  map[string]*modelInfo
+}
+
+func (mc *_modelCache) all() map[string]*modelInfo {
+	m := make(map[string]*modelInfo, len(mc.cache))
+	for k, v := range mc.cache {
+		m[k] = v
+	}
+	return m
+}
+
+func (mc *_modelCache) allOrdered() []*modelInfo {
+	m := make([]*modelInfo, 0, len(mc.orders))
+	for _, v := range mc.cache {
+		m = append(m, v)
+	}
+	return m
+}
+
+func (mc *_modelCache) get(table string) (mi *modelInfo, ok bool) {
+	mi, ok = mc.cache[table]
+	return
+}
+
+func (mc *_modelCache) set(table string, mi *modelInfo) *modelInfo {
+	mii := mc.cache[table]
+	mc.cache[table] = mi
+	if mii == nil {
+		mc.orders = append(mc.orders, table)
+	}
+	return mii
+}