add comments for orm packages, part 2

orm/db_sqlite.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 )
 
+// sqlite operators.
 var sqliteOperators = map[string]string{
 	"exact":       "= ?",
 	"iexact":      "LIKE ? ESCAPE '\\'",
@@ -20,6 +21,7 @@ var sqliteOperators = map[string]string{
 	"iendswith":   "LIKE ? ESCAPE '\\'",
 }
 
+// sqlite column types.
 var sqliteTypes = map[string]string{
 	"auto":            "integer NOT NULL PRIMARY KEY AUTOINCREMENT",
 	"pk":              "NOT NULL PRIMARY KEY",
@@ -40,38 +42,47 @@ var sqliteTypes = map[string]string{
 	"float64-decimal": "decimal",
 }
 
+// sqlite dbBaser.
 type dbBaseSqlite struct {
 	dbBase
 }
 
 var _ dbBaser = new(dbBaseSqlite)
 
+// get sqlite operator.
 func (d *dbBaseSqlite) OperatorSql(operator string) string {
 	return sqliteOperators[operator]
 }
 
+// generate functioned sql for sqlite.
+// only support DATE(text).
 func (d *dbBaseSqlite) GenerateOperatorLeftCol(fi *fieldInfo, operator string, leftCol *string) {
 	if fi.fieldType == TypeDateField {
 		*leftCol = fmt.Sprintf("DATE(%s)", *leftCol)
 	}
 }
 
+// unable updating joined record in sqlite.
 func (d *dbBaseSqlite) SupportUpdateJoin() bool {
 	return false
 }
 
+// max int in sqlite.
 func (d *dbBaseSqlite) MaxLimit() uint64 {
 	return 9223372036854775807
 }
 
+// get column types in sqlite.
 func (d *dbBaseSqlite) DbTypes() map[string]string {
 	return sqliteTypes
 }
 
+// get show tables sql in sqlite.
 func (d *dbBaseSqlite) ShowTablesQuery() string {
 	return "SELECT name FROM sqlite_master WHERE type = 'table'"
 }
 
+// get columns in sqlite.
 func (d *dbBaseSqlite) GetColumns(db dbQuerier, table string) (map[string][3]string, error) {
 	query := d.ins.ShowColumnsQuery(table)
 	rows, err := db.Query(query)
@@ -92,10 +103,12 @@ func (d *dbBaseSqlite) GetColumns(db dbQuerier, table string) (map[string][3]str
 	return columns, nil
 }
 
+// get show columns sql in sqlite.
 func (d *dbBaseSqlite) ShowColumnsQuery(table string) string {
 	return fmt.Sprintf("pragma table_info('%s')", table)
 }
 
+// check index exist in sqlite.
 func (d *dbBaseSqlite) IndexExists(db dbQuerier, table string, name string) bool {
 	query := fmt.Sprintf("PRAGMA index_list('%s')", table)
 	rows, err := db.Query(query)
@@ -113,6 +126,7 @@ func (d *dbBaseSqlite) IndexExists(db dbQuerier, table string, name string) bool
 	return false
 }
 
+// create new sqlite dbBaser.
 func newdbBaseSqlite() dbBaser {
 	b := new(dbBaseSqlite)
 	b.ins = b