Update to latest mssqldriver (#7613)

* New driver does not tolerate USE - handle this by closing db and reopening db in the new dbname

vendor/github.com/denisenkom/go-mssqldb/tvp_go19.go

@@ -0,0 +1,231 @@
+// +build go1.9
+
+package mssql
+
+import (
+	"bytes"
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"reflect"
+	"strings"
+	"time"
+)
+
+const (
+	jsonTag      = "json"
+	tvpTag       = "tvp"
+	skipTagValue = "-"
+	sqlSeparator = "."
+)
+
+var (
+	ErrorEmptyTVPTypeName = errors.New("TypeName must not be empty")
+	ErrorTypeSlice        = errors.New("TVP must be slice type")
+	ErrorTypeSliceIsEmpty = errors.New("TVP mustn't be null value")
+	ErrorSkip             = errors.New("all fields mustn't skip")
+	ErrorObjectName       = errors.New("wrong tvp name")
+	ErrorWrongTyping      = errors.New("the number of elements in columnStr and tvpFieldIndexes do not align")
+)
+
+//TVP is driver type, which allows supporting Table Valued Parameters (TVP) in SQL Server
+type TVP struct {
+	//TypeName mustn't be default value
+	TypeName string
+	//Value must be the slice, mustn't be nil
+	Value interface{}
+}
+
+func (tvp TVP) check() error {
+	if len(tvp.TypeName) == 0 {
+		return ErrorEmptyTVPTypeName
+	}
+	if !isProc(tvp.TypeName) {
+		return ErrorEmptyTVPTypeName
+	}
+	if sepCount := getCountSQLSeparators(tvp.TypeName); sepCount > 1 {
+		return ErrorObjectName
+	}
+	valueOf := reflect.ValueOf(tvp.Value)
+	if valueOf.Kind() != reflect.Slice {
+		return ErrorTypeSlice
+	}
+	if valueOf.IsNil() {
+		return ErrorTypeSliceIsEmpty
+	}
+	if reflect.TypeOf(tvp.Value).Elem().Kind() != reflect.Struct {
+		return ErrorTypeSlice
+	}
+	return nil
+}
+
+func (tvp TVP) encode(schema, name string, columnStr []columnStruct, tvpFieldIndexes []int) ([]byte, error) {
+	if len(columnStr) != len(tvpFieldIndexes) {
+		return nil, ErrorWrongTyping
+	}
+	preparedBuffer := make([]byte, 0, 20+(10*len(columnStr)))
+	buf := bytes.NewBuffer(preparedBuffer)
+	err := writeBVarChar(buf, "")
+	if err != nil {
+		return nil, err
+	}
+
+	writeBVarChar(buf, schema)
+	writeBVarChar(buf, name)
+	binary.Write(buf, binary.LittleEndian, uint16(len(columnStr)))
+
+	for i, column := range columnStr {
+		binary.Write(buf, binary.LittleEndian, uint32(column.UserType))
+		binary.Write(buf, binary.LittleEndian, uint16(column.Flags))
+		writeTypeInfo(buf, &columnStr[i].ti)
+		writeBVarChar(buf, "")
+	}
+	// The returned error is always nil
+	buf.WriteByte(_TVP_END_TOKEN)
+
+	conn := new(Conn)
+	conn.sess = new(tdsSession)
+	conn.sess.loginAck = loginAckStruct{TDSVersion: verTDS73}
+	stmt := &Stmt{
+		c: conn,
+	}
+
+	val := reflect.ValueOf(tvp.Value)
+	for i := 0; i < val.Len(); i++ {
+		refStr := reflect.ValueOf(val.Index(i).Interface())
+		buf.WriteByte(_TVP_ROW_TOKEN)
+		for columnStrIdx, fieldIdx := range tvpFieldIndexes {
+			field := refStr.Field(fieldIdx)
+			tvpVal := field.Interface()
+			valOf := reflect.ValueOf(tvpVal)
+			elemKind := field.Kind()
+			if elemKind == reflect.Ptr && valOf.IsNil() {
+				switch tvpVal.(type) {
+				case *bool, *time.Time, *int8, *int16, *int32, *int64, *float32, *float64, *int:
+					binary.Write(buf, binary.LittleEndian, uint8(0))
+					continue
+				default:
+					binary.Write(buf, binary.LittleEndian, uint64(_PLP_NULL))
+					continue
+				}
+			}
+			if elemKind == reflect.Slice && valOf.IsNil() {
+				binary.Write(buf, binary.LittleEndian, uint64(_PLP_NULL))
+				continue
+			}
+
+			cval, err := convertInputParameter(tvpVal)
+			if err != nil {
+				return nil, fmt.Errorf("failed to convert tvp parameter row col: %s", err)
+			}
+			param, err := stmt.makeParam(cval)
+			if err != nil {
+				return nil, fmt.Errorf("failed to make tvp parameter row col: %s", err)
+			}
+			columnStr[columnStrIdx].ti.Writer(buf, param.ti, param.buffer)
+		}
+	}
+	buf.WriteByte(_TVP_END_TOKEN)
+	return buf.Bytes(), nil
+}
+
+func (tvp TVP) columnTypes() ([]columnStruct, []int, error) {
+	val := reflect.ValueOf(tvp.Value)
+	var firstRow interface{}
+	if val.Len() != 0 {
+		firstRow = val.Index(0).Interface()
+	} else {
+		firstRow = reflect.New(reflect.TypeOf(tvp.Value).Elem()).Elem().Interface()
+	}
+
+	tvpRow := reflect.TypeOf(firstRow)
+	columnCount := tvpRow.NumField()
+	defaultValues := make([]interface{}, 0, columnCount)
+	tvpFieldIndexes := make([]int, 0, columnCount)
+	for i := 0; i < columnCount; i++ {
+		field := tvpRow.Field(i)
+		tvpTagValue, isTvpTag := field.Tag.Lookup(tvpTag)
+		jsonTagValue, isJsonTag := field.Tag.Lookup(jsonTag)
+		if IsSkipField(tvpTagValue, isTvpTag, jsonTagValue, isJsonTag) {
+			continue
+		}
+		tvpFieldIndexes = append(tvpFieldIndexes, i)
+		if field.Type.Kind() == reflect.Ptr {
+			v := reflect.New(field.Type.Elem())
+			defaultValues = append(defaultValues, v.Interface())
+			continue
+		}
+		defaultValues = append(defaultValues, reflect.Zero(field.Type).Interface())
+	}
+
+	if columnCount-len(tvpFieldIndexes) == columnCount {
+		return nil, nil, ErrorSkip
+	}
+
+	conn := new(Conn)
+	conn.sess = new(tdsSession)
+	conn.sess.loginAck = loginAckStruct{TDSVersion: verTDS73}
+	stmt := &Stmt{
+		c: conn,
+	}
+
+	columnConfiguration := make([]columnStruct, 0, columnCount)
+	for index, val := range defaultValues {
+		cval, err := convertInputParameter(val)
+		if err != nil {
+			return nil, nil, fmt.Errorf("failed to convert tvp parameter row %d col %d: %s", index, val, err)
+		}
+		param, err := stmt.makeParam(cval)
+		if err != nil {
+			return nil, nil, err
+		}
+		column := columnStruct{
+			ti: param.ti,
+		}
+		switch param.ti.TypeId {
+		case typeNVarChar, typeBigVarBin:
+			column.ti.Size = 0
+		}
+		columnConfiguration = append(columnConfiguration, column)
+	}
+
+	return columnConfiguration, tvpFieldIndexes, nil
+}
+
+func IsSkipField(tvpTagValue string, isTvpValue bool, jsonTagValue string, isJsonTagValue bool) bool {
+	if !isTvpValue && !isJsonTagValue {
+		return false
+	} else if isTvpValue && tvpTagValue != skipTagValue {
+		return false
+	} else if !isTvpValue && isJsonTagValue && jsonTagValue != skipTagValue {
+		return false
+	}
+	return true
+}
+
+func getSchemeAndName(tvpName string) (string, string, error) {
+	if len(tvpName) == 0 {
+		return "", "", ErrorEmptyTVPTypeName
+	}
+	splitVal := strings.Split(tvpName, ".")
+	if len(splitVal) > 2 {
+		return "", "", errors.New("wrong tvp name")
+	}
+	if len(splitVal) == 2 {
+		res := make([]string, 2)
+		for key, value := range splitVal {
+			tmp := strings.Replace(value, "[", "", -1)
+			tmp = strings.Replace(tmp, "]", "", -1)
+			res[key] = tmp
+		}
+		return res[0], res[1], nil
+	}
+	tmp := strings.Replace(splitVal[0], "[", "", -1)
+	tmp = strings.Replace(tmp, "]", "", -1)
+
+	return "", tmp, nil
+}
+
+func getCountSQLSeparators(str string) int {
+	return strings.Count(str, sqlSeparator)
+}