support params > 65535 for postgres.

integrations/session_insert_test.go

@@ -7,8 +7,10 @@ package integrations
 import (
 	"fmt"
 	"reflect"
+	"strings"
 	"testing"
 	"time"
+	"xorm.io/xorm/schemas"
 
 	"xorm.io/xorm"
 
@@ -45,6 +47,26 @@ func TestInsertMulti(t *testing.T) {
 		append([]TestMulti{}, TestMulti{1, "test1"}, TestMulti{2, "test2"}, TestMulti{3, "test3"}))
 	assert.NoError(t, err)
 	assert.EqualValues(t, 3, num)
+
+	if schemas.DBType(strings.ToLower(dbType)) == schemas.POSTGRES {
+		type TestMultiPG struct {
+			Id   int64  `xorm:"int(11) pk"`
+			Name string `xorm:"varchar(255)"`
+		}
+		assert.NoError(t, testEngine.Sync2(new(TestMultiPG)))
+
+		var data []TestMultiPG
+		for i := 1; i < 655360; i++ {
+			data = append(data, TestMultiPG{
+				Id:   int64(i),
+				Name: fmt.Sprintf("test %d", i),
+			})
+		}
+
+		num, err := insertMultiDatas(655359, data)
+		assert.NoError(t, err)
+		assert.EqualValues(t, 655359, num)
+	}
 }
 
 func insertMultiDatas(step int, datas interface{}) (num int64, err error) {

session_insert.go

@@ -19,6 +19,9 @@ import (
 // ErrNoElementsOnSlice represents an error there is no element when insert
 var ErrNoElementsOnSlice = errors.New("No element on slice when insert")
 
+// maxPgParams pg only support max 65535 placeholder params
+const maxPgParams = 65535
+
 // Insert insert one or more beans
 func (session *Session) Insert(beans ...interface{}) (int64, error) {
 	var affected int64
@@ -114,14 +117,27 @@ func (session *Session) innerInsertMulti(rowsSlicePtr interface{}) (int64, error
 	var (
 		table      = session.statement.RefTable
 		size       = sliceValue.Len()
-		colNames       []string
-		colMultiPlaces []string
-		args           []interface{}
 		cols       []*schemas.Column
+		colNames   []string
+		step       = size
+		affectRows int64
 	)
 
-	for i := 0; i < size; i++ {
-		v := sliceValue.Index(i)
+	if session.engine.dialect.URI().DBType == schemas.POSTGRES {
+		step = maxPgParams / len(session.statement.RefTable.Columns())
+	}
+
+	for i := 0; i < size; i += step {
+		var colMultiPlaces []string
+		var args []interface{}
+
+		stepSize := i + step
+		if stepSize > size {
+			stepSize = size
+		}
+
+		for j := i; j < stepSize; j++ {
+			v := sliceValue.Index(j)
 			var vv reflect.Value
 			switch v.Kind() {
 			case reflect.Interface:
@@ -146,7 +162,7 @@ func (session *Session) innerInsertMulti(rowsSlicePtr interface{}) (int64, error
 			for _, col := range table.Columns() {
 				ptrFieldValue, err := col.ValueOfV(&vv)
 				if err != nil {
-				return 0, err
+					return affectRows, err
 				}
 				fieldValue := *ptrFieldValue
 				if col.IsAutoIncrement && utils.IsZero(fieldValue.Interface()) {
@@ -183,12 +199,12 @@ func (session *Session) innerInsertMulti(rowsSlicePtr interface{}) (int64, error
 				} else {
 					arg, err := session.statement.Value2Interface(col, fieldValue)
 					if err != nil {
-					return 0, err
+						return affectRows, err
 					}
 					args = append(args, arg)
 				}
 
-			if i == 0 {
+				if j == 0 {
 					colNames = append(colNames, col.Name)
 					cols = append(cols, col)
 				}
@@ -218,7 +234,16 @@ func (session *Session) innerInsertMulti(rowsSlicePtr interface{}) (int64, error
 		}
 		res, err := session.exec(sql, args...)
 		if err != nil {
-		return 0, err
+			return affectRows, err
+		}
+		af, err := res.RowsAffected()
+		if err != nil {
+			return affectRows, err
+		}
+		affectRows += af
+		if stepSize == size {
+			break
+		}
 	}
 
 	session.cacheInsert(tableName)
@@ -254,7 +279,7 @@ func (session *Session) innerInsertMulti(rowsSlicePtr interface{}) (int64, error
 	}
 
 	cleanupProcessorsClosures(&session.afterClosures)
-	return res.RowsAffected()
+	return affectRows, nil
 }
 
 // InsertMulti insert multiple records