Support local sql log (go-xorm#1338)

Author: lunny

engine.go

@@ -330,7 +330,7 @@ func (engine *Engine) Ping() error {
 	return session.Ping()
 }
 
-// logging sql
+// logSQL save sql
 func (engine *Engine) logSQL(sqlStr string, sqlArgs ...interface{}) {
 	if engine.showSQL && !engine.showExecTime {
 		if len(sqlArgs) > 0 {

session.go

@@ -57,6 +57,7 @@ type Session struct {
 	//beforeSQLExec func(string, ...interface{})
 	lastSQL     string
 	lastSQLArgs []interface{}
+	showSQL     bool
 
 	ctx         context.Context
 	sessionType sessionType
@@ -72,6 +73,7 @@ func (session *Session) Clone() *Session {
 func (session *Session) Init() {
 	session.statement.Init()
 	session.statement.Engine = session.engine
+	session.showSQL = session.engine.showSQL
 	session.isAutoCommit = true
 	session.isCommitedOrRollbacked = false
 	session.isAutoClose = false
@@ -226,6 +228,16 @@ func (session *Session) Cascade(trueOrFalse ...bool) *Session {
 	return session
 }
 
+// MustLogSQL means record SQL or not and don't follow engine's setting
+func (session *Session) MustLogSQL(log ...bool) *Session {
+	if len(log) > 0 {
+		session.showSQL = log[0]
+	} else {
+		session.showSQL = true
+	}
+	return session
+}
+
 // NoCache ask this session do not retrieve data from cache system and
 // get data from database directly.
 func (session *Session) NoCache() *Session {
@@ -842,7 +854,17 @@ func (session *Session) slice2Bean(scanResults []interface{}, fields []string, b
 func (session *Session) saveLastSQL(sql string, args ...interface{}) {
 	session.lastSQL = sql
 	session.lastSQLArgs = args
-	session.engine.logSQL(sql, args...)
+	session.logSQL(sql, args...)
+}
+
+func (session *Session) logSQL(sqlStr string, sqlArgs ...interface{}) {
+	if session.showSQL && !session.engine.showExecTime {
+		if len(sqlArgs) > 0 {
+			session.engine.logger.Infof("[SQL] %v %#v", sqlStr, sqlArgs)
+		} else {
+			session.engine.logger.Infof("[SQL] %v", sqlStr)
+		}
+	}
 }
 
 // LastSQL returns last query information

session_raw.go

@@ -27,7 +27,9 @@ func (session *Session) queryRows(sqlStr string, args ...interface{}) (*core.Row
 
 	session.queryPreprocess(&sqlStr, args...)
 
-	if session.engine.showSQL {
+	if session.showSQL {
+		session.lastSQL = sqlStr
+		session.lastSQLArgs = args
 		if session.engine.showExecTime {
 			b4ExecTime := time.Now()
 			defer func() {