diff --git a/session_delete.go b/session_delete.go
index d9cf3ea93..64b3f7627 100644
--- a/session_delete.go
+++ b/session_delete.go
@@ -97,7 +97,8 @@ func (session *Session) Delete(bean interface{}) (int64, error) {
 	if err != nil {
 		return 0, err
 	}
-	if len(condSQL) == 0 && session.statement.LimitN == 0 {
+	pLimitN := session.statement.LimitN
+	if len(condSQL) == 0 && (pLimitN == nil || *pLimitN == 0) {
 		return 0, ErrNeedDeletedCond
 	}
 
@@ -115,8 +116,9 @@ func (session *Session) Delete(bean interface{}) (int64, error) {
 	if len(session.statement.OrderStr) > 0 {
 		orderSQL += fmt.Sprintf(" ORDER BY %s", session.statement.OrderStr)
 	}
-	if session.statement.LimitN > 0 {
-		orderSQL += fmt.Sprintf(" LIMIT %d", session.statement.LimitN)
+	if pLimitN != nil && *pLimitN > 0 {
+		limitNValue := *pLimitN
+		orderSQL += fmt.Sprintf(" LIMIT %d", limitNValue)
 	}
 
 	if len(orderSQL) > 0 {
@@ -135,7 +137,7 @@ func (session *Session) Delete(bean interface{}) (int64, error) {
 			} else {
 				deleteSQL += " WHERE " + inSQL
 			}
-		// TODO: how to handle delete limit on mssql?
+			// TODO: how to handle delete limit on mssql?
 		case core.MSSQL:
 			return 0, ErrNotImplemented
 		default:
@@ -176,7 +178,7 @@ func (session *Session) Delete(bean interface{}) (int64, error) {
 				} else {
 					realSQL += " WHERE " + inSQL
 				}
-			// TODO: how to handle delete limit on mssql?
+				// TODO: how to handle delete limit on mssql?
 			case core.MSSQL:
 				return 0, ErrNotImplemented
 			default:
diff --git a/session_iterate.go b/session_iterate.go
index 071fce499..c194b641a 100644
--- a/session_iterate.go
+++ b/session_iterate.go
@@ -61,9 +61,9 @@ func (session *Session) bufferIterate(bean interface{}, fun IterFunc) error {
 	}
 
 	var bufferSize = session.statement.bufferSize
-	var limit = session.statement.LimitN
-	if limit > 0 && bufferSize > limit {
-		bufferSize = limit
+	var pLimitN = session.statement.LimitN
+	if pLimitN != nil && bufferSize > *pLimitN {
+		bufferSize = *pLimitN
 	}
 	var start = session.statement.Start
 	v := rValue(bean)
@@ -83,11 +83,11 @@ func (session *Session) bufferIterate(bean interface{}, fun IterFunc) error {
 		}
 
 		start = start + slice.Elem().Len()
-		if limit > 0 && idx+bufferSize > limit {
-			bufferSize = limit - idx
+		if pLimitN != nil && idx+bufferSize > *pLimitN {
+			bufferSize = *pLimitN - idx
 		}
 
-		if bufferSize <= 0 || slice.Elem().Len() < bufferSize || idx == limit {
+		if bufferSize <= 0 || slice.Elem().Len() < bufferSize || (pLimitN != nil && idx == *pLimitN) {
 			break
 		}
 	}
diff --git a/session_update.go b/session_update.go
index 42dfaacd0..0ddccaade 100644
--- a/session_update.go
+++ b/session_update.go
@@ -296,11 +296,12 @@ func (session *Session) Update(bean interface{}, condiBean ...interface{}) (int6
 	var tableName = session.statement.TableName()
 	// TODO: Oracle support needed
 	var top string
-	if st.LimitN > 0 {
+	if st.LimitN != nil {
+		limitValue := *st.LimitN
 		if st.Engine.dialect.DBType() == core.MYSQL {
-			condSQL = condSQL + fmt.Sprintf(" LIMIT %d", st.LimitN)
+			condSQL = condSQL + fmt.Sprintf(" LIMIT %d", limitValue)
 		} else if st.Engine.dialect.DBType() == core.SQLITE {
-			tempCondSQL := condSQL + fmt.Sprintf(" LIMIT %d", st.LimitN)
+			tempCondSQL := condSQL + fmt.Sprintf(" LIMIT %d", limitValue)
 			cond = cond.And(builder.Expr(fmt.Sprintf("rowid IN (SELECT rowid FROM %v %v)",
 				session.engine.Quote(tableName), tempCondSQL), condArgs...))
 			condSQL, condArgs, err = builder.ToSQL(cond)
@@ -311,7 +312,7 @@ func (session *Session) Update(bean interface{}, condiBean ...interface{}) (int6
 				condSQL = "WHERE " + condSQL
 			}
 		} else if st.Engine.dialect.DBType() == core.POSTGRES {
-			tempCondSQL := condSQL + fmt.Sprintf(" LIMIT %d", st.LimitN)
+			tempCondSQL := condSQL + fmt.Sprintf(" LIMIT %d", limitValue)
 			cond = cond.And(builder.Expr(fmt.Sprintf("CTID IN (SELECT CTID FROM %v %v)",
 				session.engine.Quote(tableName), tempCondSQL), condArgs...))
 			condSQL, condArgs, err = builder.ToSQL(cond)
@@ -326,7 +327,7 @@ func (session *Session) Update(bean interface{}, condiBean ...interface{}) (int6
 			if st.OrderStr != "" && st.Engine.dialect.DBType() == core.MSSQL &&
 				table != nil && len(table.PrimaryKeys) == 1 {
 				cond = builder.Expr(fmt.Sprintf("%s IN (SELECT TOP (%d) %s FROM %v%v)",
-					table.PrimaryKeys[0], st.LimitN, table.PrimaryKeys[0],
+					table.PrimaryKeys[0], limitValue, table.PrimaryKeys[0],
 					session.engine.Quote(tableName), condSQL), condArgs...)
 
 				condSQL, condArgs, err = builder.ToSQL(cond)
@@ -337,7 +338,7 @@ func (session *Session) Update(bean interface{}, condiBean ...interface{}) (int6
 					condSQL = "WHERE " + condSQL
 				}
 			} else {
-				top = fmt.Sprintf("TOP (%d) ", st.LimitN)
+				top = fmt.Sprintf("TOP (%d) ", limitValue)
 			}
 		}
 	}
diff --git a/statement.go b/statement.go
index a7f7010ad..15c387aa8 100644
--- a/statement.go
+++ b/statement.go
@@ -22,7 +22,7 @@ type Statement struct {
 	RefTable        *core.Table
 	Engine          *Engine
 	Start           int
-	LimitN          int
+	LimitN          *int
 	idParam         *core.PK
 	OrderStr        string
 	JoinStr         string
@@ -66,7 +66,7 @@ type Statement struct {
 func (statement *Statement) Init() {
 	statement.RefTable = nil
 	statement.Start = 0
-	statement.LimitN = 0
+	statement.LimitN = nil
 	statement.OrderStr = ""
 	statement.UseCascade = true
 	statement.JoinStr = ""
@@ -689,7 +689,7 @@ func (statement *Statement) Top(limit int) *Statement {
 
 // Limit generate LIMIT start, limit statement
 func (statement *Statement) Limit(limit int, start ...int) *Statement {
-	statement.LimitN = limit
+	statement.LimitN = &limit
 	if len(start) > 0 {
 		statement.Start = start[0]
 	}
@@ -1062,9 +1062,11 @@ func (statement *Statement) genSelectSQL(columnStr, condSQL string, needLimit, n
 		fromStr = fmt.Sprintf("%v %v", fromStr, statement.JoinStr)
 	}
 
+	pLimitN := statement.LimitN
 	if dialect.DBType() == core.MSSQL {
-		if statement.LimitN > 0 {
-			top = fmt.Sprintf(" TOP %d ", statement.LimitN)
+		if pLimitN != nil {
+			LimitNValue := *pLimitN
+			top = fmt.Sprintf(" TOP %d ", LimitNValue)
 		}
 		if statement.Start > 0 {
 			var column string
@@ -1125,16 +1127,20 @@ func (statement *Statement) genSelectSQL(columnStr, condSQL string, needLimit, n
 	if needLimit {
 		if dialect.DBType() != core.MSSQL && dialect.DBType() != core.ORACLE {
 			if statement.Start > 0 {
-				fmt.Fprintf(&buf, " LIMIT %v OFFSET %v", statement.LimitN, statement.Start)
-			} else if statement.LimitN > 0 {
-				fmt.Fprint(&buf, " LIMIT ", statement.LimitN)
+				if pLimitN != nil {
+					fmt.Fprintf(&buf, " LIMIT %v OFFSET %v", *pLimitN, statement.Start)
+				} else {
+					fmt.Fprintf(&buf, "LIMIT 0 OFFSET %v", statement.Start)
+				}
+			} else if pLimitN != nil {
+				fmt.Fprint(&buf, " LIMIT ", *pLimitN)
 			}
 		} else if dialect.DBType() == core.ORACLE {
-			if statement.Start != 0 || statement.LimitN != 0 {
+			if statement.Start != 0 || pLimitN != nil {
 				oldString := buf.String()
 				buf.Reset()
 				fmt.Fprintf(&buf, "SELECT %v FROM (SELECT %v,ROWNUM RN FROM (%v) at WHERE ROWNUM <= %d) aat WHERE RN > %d",
-					columnStr, columnStr, oldString, statement.Start+statement.LimitN, statement.Start)
+					columnStr, columnStr, oldString, statement.Start+*pLimitN, statement.Start)
 			}
 		}
 	}
@@ -1191,8 +1197,9 @@ func (statement *Statement) convertIDSQL(sqlStr string) string {
 		}
 
 		var top string
-		if statement.LimitN > 0 && statement.Engine.dialect.DBType() == core.MSSQL {
-			top = fmt.Sprintf("TOP %d ", statement.LimitN)
+		pLimitN := statement.LimitN
+		if pLimitN != nil && statement.Engine.dialect.DBType() == core.MSSQL {
+			top = fmt.Sprintf("TOP %d ", *pLimitN)
 		}
 
 		newsql := fmt.Sprintf("SELECT %s%s FROM %v", top, colstrs, sqls[1])