orm support auto create db

orm/db_postgres.go

@@ -20,6 +20,26 @@ var postgresOperators = map[string]string{
 	"iendswith":   "LIKE UPPER(?)",
 }
 
+var postgresTypes = map[string]string{
+	"auto":            "serial NOT NULL PRIMARY KEY",
+	"pk":              "NOT NULL PRIMARY KEY",
+	"bool":            "bool",
+	"string":          "varchar(%d)",
+	"string-text":     "text",
+	"time.Time-date":  "date",
+	"time.Time":       "timestamp with time zone",
+	"int8":            `smallint CHECK("%COL%" >= -127 AND "%COL%" <= 128)`,
+	"int16":           "smallint",
+	"int32":           "integer",
+	"int64":           "bigint",
+	"uint8":           `smallint CHECK("%COL%" >= 0 AND "%COL%" <= 255)`,
+	"uint16":          `integer CHECK("%COL%" >= 0)`,
+	"uint32":          `bigint CHECK("%COL%" >= 0)`,
+	"uint64":          `bigint CHECK("%COL%" >= 0)`,
+	"float64":         "double precision",
+	"float64-decimal": "numeric(%d, %d)",
+}
+
 type dbBasePostgres struct {
 	dbBase
 }
@@ -87,6 +107,10 @@ func (d *dbBasePostgres) HasReturningID(mi *modelInfo, query *string) (has bool)
 	return
 }
 
+func (d *dbBasePostgres) DbTypes() map[string]string {
+	return postgresTypes
+}
+
 func newdbBasePostgres() dbBaser {
 	b := new(dbBasePostgres)
 	b.ins = b