78e5317242
* New driver does not tolerate USE - handle this by closing db and reopening db in the new dbname
555 lines
13 KiB
Go
555 lines
13 KiB
Go
package mssql
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import (
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"bytes"
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"context"
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"encoding/binary"
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"fmt"
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"math"
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"reflect"
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"strconv"
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"strings"
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"time"
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)
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type Bulk struct {
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// ctx is used only for AddRow and Done methods.
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// This could be removed if AddRow and Done accepted
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// a ctx field as well, which is available with the
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// database/sql call.
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ctx context.Context
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cn *Conn
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metadata []columnStruct
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bulkColumns []columnStruct
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columnsName []string
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tablename string
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numRows int
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headerSent bool
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Options BulkOptions
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Debug bool
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}
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type BulkOptions struct {
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CheckConstraints bool
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FireTriggers bool
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KeepNulls bool
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KilobytesPerBatch int
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RowsPerBatch int
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Order []string
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Tablock bool
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}
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type DataValue interface{}
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func (cn *Conn) CreateBulk(table string, columns []string) (_ *Bulk) {
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b := Bulk{ctx: context.Background(), cn: cn, tablename: table, headerSent: false, columnsName: columns}
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b.Debug = false
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return &b
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}
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func (cn *Conn) CreateBulkContext(ctx context.Context, table string, columns []string) (_ *Bulk) {
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b := Bulk{ctx: ctx, cn: cn, tablename: table, headerSent: false, columnsName: columns}
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b.Debug = false
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return &b
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}
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func (b *Bulk) sendBulkCommand(ctx context.Context) (err error) {
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//get table columns info
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err = b.getMetadata(ctx)
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if err != nil {
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return err
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}
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//match the columns
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for _, colname := range b.columnsName {
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var bulkCol *columnStruct
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for _, m := range b.metadata {
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if m.ColName == colname {
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bulkCol = &m
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break
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}
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}
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if bulkCol != nil {
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if bulkCol.ti.TypeId == typeUdt {
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//send udt as binary
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bulkCol.ti.TypeId = typeBigVarBin
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}
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b.bulkColumns = append(b.bulkColumns, *bulkCol)
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b.dlogf("Adding column %s %s %#x", colname, bulkCol.ColName, bulkCol.ti.TypeId)
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} else {
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return fmt.Errorf("Column %s does not exist in destination table %s", colname, b.tablename)
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}
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}
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//create the bulk command
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//columns definitions
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var col_defs bytes.Buffer
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for i, col := range b.bulkColumns {
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if i != 0 {
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col_defs.WriteString(", ")
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}
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col_defs.WriteString("[" + col.ColName + "] " + makeDecl(col.ti))
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}
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//options
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var with_opts []string
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if b.Options.CheckConstraints {
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with_opts = append(with_opts, "CHECK_CONSTRAINTS")
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}
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if b.Options.FireTriggers {
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with_opts = append(with_opts, "FIRE_TRIGGERS")
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}
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if b.Options.KeepNulls {
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with_opts = append(with_opts, "KEEP_NULLS")
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}
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if b.Options.KilobytesPerBatch > 0 {
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with_opts = append(with_opts, fmt.Sprintf("KILOBYTES_PER_BATCH = %d", b.Options.KilobytesPerBatch))
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}
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if b.Options.RowsPerBatch > 0 {
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with_opts = append(with_opts, fmt.Sprintf("ROWS_PER_BATCH = %d", b.Options.RowsPerBatch))
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}
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if len(b.Options.Order) > 0 {
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with_opts = append(with_opts, fmt.Sprintf("ORDER(%s)", strings.Join(b.Options.Order, ",")))
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}
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if b.Options.Tablock {
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with_opts = append(with_opts, "TABLOCK")
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}
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var with_part string
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if len(with_opts) > 0 {
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with_part = fmt.Sprintf("WITH (%s)", strings.Join(with_opts, ","))
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}
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query := fmt.Sprintf("INSERT BULK %s (%s) %s", b.tablename, col_defs.String(), with_part)
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stmt, err := b.cn.PrepareContext(ctx, query)
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if err != nil {
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return fmt.Errorf("Prepare failed: %s", err.Error())
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}
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b.dlogf(query)
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_, err = stmt.(*Stmt).ExecContext(ctx, nil)
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if err != nil {
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return err
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}
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b.headerSent = true
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var buf = b.cn.sess.buf
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buf.BeginPacket(packBulkLoadBCP, false)
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// Send the columns metadata.
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columnMetadata := b.createColMetadata()
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_, err = buf.Write(columnMetadata)
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return
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}
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// AddRow immediately writes the row to the destination table.
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// The arguments are the row values in the order they were specified.
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func (b *Bulk) AddRow(row []interface{}) (err error) {
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if !b.headerSent {
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err = b.sendBulkCommand(b.ctx)
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if err != nil {
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return
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}
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}
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if len(row) != len(b.bulkColumns) {
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return fmt.Errorf("Row does not have the same number of columns than the destination table %d %d",
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len(row), len(b.bulkColumns))
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}
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bytes, err := b.makeRowData(row)
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if err != nil {
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return
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}
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_, err = b.cn.sess.buf.Write(bytes)
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if err != nil {
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return
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}
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b.numRows = b.numRows + 1
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return
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}
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func (b *Bulk) makeRowData(row []interface{}) ([]byte, error) {
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buf := new(bytes.Buffer)
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buf.WriteByte(byte(tokenRow))
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var logcol bytes.Buffer
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for i, col := range b.bulkColumns {
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if b.Debug {
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logcol.WriteString(fmt.Sprintf(" col[%d]='%v' ", i, row[i]))
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}
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param, err := b.makeParam(row[i], col)
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if err != nil {
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return nil, fmt.Errorf("bulkcopy: %s", err.Error())
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}
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if col.ti.Writer == nil {
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return nil, fmt.Errorf("no writer for column: %s, TypeId: %#x",
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col.ColName, col.ti.TypeId)
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}
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err = col.ti.Writer(buf, param.ti, param.buffer)
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if err != nil {
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return nil, fmt.Errorf("bulkcopy: %s", err.Error())
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}
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}
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b.dlogf("row[%d] %s\n", b.numRows, logcol.String())
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return buf.Bytes(), nil
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}
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func (b *Bulk) Done() (rowcount int64, err error) {
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if b.headerSent == false {
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//no rows had been sent
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return 0, nil
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}
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var buf = b.cn.sess.buf
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buf.WriteByte(byte(tokenDone))
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binary.Write(buf, binary.LittleEndian, uint16(doneFinal))
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binary.Write(buf, binary.LittleEndian, uint16(0)) // curcmd
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if b.cn.sess.loginAck.TDSVersion >= verTDS72 {
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binary.Write(buf, binary.LittleEndian, uint64(0)) //rowcount 0
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} else {
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binary.Write(buf, binary.LittleEndian, uint32(0)) //rowcount 0
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}
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buf.FinishPacket()
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tokchan := make(chan tokenStruct, 5)
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go processResponse(b.ctx, b.cn.sess, tokchan, nil)
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var rowCount int64
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for token := range tokchan {
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switch token := token.(type) {
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case doneStruct:
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if token.Status&doneCount != 0 {
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rowCount = int64(token.RowCount)
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}
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if token.isError() {
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return 0, token.getError()
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}
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case error:
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return 0, b.cn.checkBadConn(token)
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}
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}
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return rowCount, nil
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}
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func (b *Bulk) createColMetadata() []byte {
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buf := new(bytes.Buffer)
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buf.WriteByte(byte(tokenColMetadata)) // token
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binary.Write(buf, binary.LittleEndian, uint16(len(b.bulkColumns))) // column count
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for i, col := range b.bulkColumns {
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if b.cn.sess.loginAck.TDSVersion >= verTDS72 {
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binary.Write(buf, binary.LittleEndian, uint32(col.UserType)) // usertype, always 0?
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} else {
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binary.Write(buf, binary.LittleEndian, uint16(col.UserType))
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}
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binary.Write(buf, binary.LittleEndian, uint16(col.Flags))
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writeTypeInfo(buf, &b.bulkColumns[i].ti)
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if col.ti.TypeId == typeNText ||
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col.ti.TypeId == typeText ||
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col.ti.TypeId == typeImage {
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tablename_ucs2 := str2ucs2(b.tablename)
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binary.Write(buf, binary.LittleEndian, uint16(len(tablename_ucs2)/2))
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buf.Write(tablename_ucs2)
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}
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colname_ucs2 := str2ucs2(col.ColName)
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buf.WriteByte(uint8(len(colname_ucs2) / 2))
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buf.Write(colname_ucs2)
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}
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return buf.Bytes()
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}
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func (b *Bulk) getMetadata(ctx context.Context) (err error) {
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stmt, err := b.cn.prepareContext(ctx, "SET FMTONLY ON")
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if err != nil {
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return
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}
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_, err = stmt.ExecContext(ctx, nil)
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if err != nil {
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return
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}
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// Get columns info.
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stmt, err = b.cn.prepareContext(ctx, fmt.Sprintf("select * from %s SET FMTONLY OFF", b.tablename))
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if err != nil {
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return
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}
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rows, err := stmt.QueryContext(ctx, nil)
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if err != nil {
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return fmt.Errorf("get columns info failed: %v", err)
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}
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b.metadata = rows.(*Rows).cols
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if b.Debug {
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for _, col := range b.metadata {
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b.dlogf("col: %s typeId: %#x size: %d scale: %d prec: %d flags: %d lcid: %#x\n",
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col.ColName, col.ti.TypeId, col.ti.Size, col.ti.Scale, col.ti.Prec,
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col.Flags, col.ti.Collation.LcidAndFlags)
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}
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}
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return rows.Close()
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}
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func (b *Bulk) makeParam(val DataValue, col columnStruct) (res param, err error) {
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res.ti.Size = col.ti.Size
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res.ti.TypeId = col.ti.TypeId
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if val == nil {
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res.ti.Size = 0
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return
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}
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switch col.ti.TypeId {
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case typeInt1, typeInt2, typeInt4, typeInt8, typeIntN:
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var intvalue int64
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switch val := val.(type) {
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case int:
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intvalue = int64(val)
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case int32:
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intvalue = int64(val)
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case int64:
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intvalue = val
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default:
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err = fmt.Errorf("mssql: invalid type for int column")
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return
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}
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res.buffer = make([]byte, res.ti.Size)
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if col.ti.Size == 1 {
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res.buffer[0] = byte(intvalue)
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} else if col.ti.Size == 2 {
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binary.LittleEndian.PutUint16(res.buffer, uint16(intvalue))
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} else if col.ti.Size == 4 {
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binary.LittleEndian.PutUint32(res.buffer, uint32(intvalue))
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} else if col.ti.Size == 8 {
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binary.LittleEndian.PutUint64(res.buffer, uint64(intvalue))
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}
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case typeFlt4, typeFlt8, typeFltN:
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var floatvalue float64
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switch val := val.(type) {
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case float32:
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floatvalue = float64(val)
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case float64:
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floatvalue = val
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case int:
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floatvalue = float64(val)
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case int64:
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floatvalue = float64(val)
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default:
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err = fmt.Errorf("mssql: invalid type for float column: %s", val)
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return
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}
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if col.ti.Size == 4 {
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res.buffer = make([]byte, 4)
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binary.LittleEndian.PutUint32(res.buffer, math.Float32bits(float32(floatvalue)))
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} else if col.ti.Size == 8 {
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res.buffer = make([]byte, 8)
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binary.LittleEndian.PutUint64(res.buffer, math.Float64bits(floatvalue))
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}
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case typeNVarChar, typeNText, typeNChar:
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switch val := val.(type) {
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case string:
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res.buffer = str2ucs2(val)
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case []byte:
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res.buffer = val
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default:
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err = fmt.Errorf("mssql: invalid type for nvarchar column: %s", val)
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return
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}
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res.ti.Size = len(res.buffer)
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case typeVarChar, typeBigVarChar, typeText, typeChar, typeBigChar:
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switch val := val.(type) {
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case string:
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res.buffer = []byte(val)
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case []byte:
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res.buffer = val
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default:
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err = fmt.Errorf("mssql: invalid type for varchar column: %s", val)
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return
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}
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res.ti.Size = len(res.buffer)
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case typeBit, typeBitN:
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if reflect.TypeOf(val).Kind() != reflect.Bool {
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err = fmt.Errorf("mssql: invalid type for bit column: %s", val)
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return
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}
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res.ti.TypeId = typeBitN
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res.ti.Size = 1
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res.buffer = make([]byte, 1)
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if val.(bool) {
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res.buffer[0] = 1
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}
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case typeDateTime2N:
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switch val := val.(type) {
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case time.Time:
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res.buffer = encodeDateTime2(val, int(col.ti.Scale))
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res.ti.Size = len(res.buffer)
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default:
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err = fmt.Errorf("mssql: invalid type for datetime2 column: %s", val)
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return
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}
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case typeDateTimeOffsetN:
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switch val := val.(type) {
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case time.Time:
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res.buffer = encodeDateTimeOffset(val, int(res.ti.Scale))
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res.ti.Size = len(res.buffer)
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default:
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err = fmt.Errorf("mssql: invalid type for datetimeoffset column: %s", val)
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return
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}
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case typeDateN:
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switch val := val.(type) {
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case time.Time:
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res.buffer = encodeDate(val)
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res.ti.Size = len(res.buffer)
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default:
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err = fmt.Errorf("mssql: invalid type for date column: %s", val)
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return
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}
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case typeDateTime, typeDateTimeN, typeDateTim4:
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switch val := val.(type) {
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case time.Time:
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if col.ti.Size == 4 {
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res.buffer = encodeDateTim4(val)
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res.ti.Size = len(res.buffer)
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} else if col.ti.Size == 8 {
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res.buffer = encodeDateTime(val)
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res.ti.Size = len(res.buffer)
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} else {
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err = fmt.Errorf("mssql: invalid size of column")
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}
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default:
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err = fmt.Errorf("mssql: invalid type for datetime column: %s", val)
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}
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// case typeMoney, typeMoney4, typeMoneyN:
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case typeDecimal, typeDecimalN, typeNumeric, typeNumericN:
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var value float64
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switch v := val.(type) {
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case int:
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value = float64(v)
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case int8:
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value = float64(v)
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case int16:
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value = float64(v)
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case int32:
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value = float64(v)
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case int64:
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value = float64(v)
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case float32:
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value = float64(v)
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case float64:
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value = v
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case string:
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if value, err = strconv.ParseFloat(v, 64); err != nil {
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return res, fmt.Errorf("bulk: unable to convert string to float: %v", err)
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}
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default:
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return res, fmt.Errorf("unknown value for decimal: %#v", v)
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}
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perc := col.ti.Prec
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scale := col.ti.Scale
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var dec Decimal
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dec, err = Float64ToDecimalScale(value, scale)
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if err != nil {
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return res, err
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}
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dec.prec = perc
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var length byte
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switch {
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case perc <= 9:
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length = 4
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case perc <= 19:
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length = 8
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case perc <= 28:
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length = 12
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default:
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length = 16
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}
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buf := make([]byte, length+1)
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// first byte length written by typeInfo.writer
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res.ti.Size = int(length) + 1
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// second byte sign
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if value < 0 {
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buf[0] = 0
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} else {
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buf[0] = 1
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}
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ub := dec.UnscaledBytes()
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l := len(ub)
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if l > int(length) {
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err = fmt.Errorf("decimal out of range: %s", dec)
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return res, err
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}
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// reverse the bytes
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for i, j := 1, l-1; j >= 0; i, j = i+1, j-1 {
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buf[i] = ub[j]
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}
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res.buffer = buf
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case typeBigVarBin, typeBigBinary:
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switch val := val.(type) {
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case []byte:
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res.ti.Size = len(val)
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res.buffer = val
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default:
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err = fmt.Errorf("mssql: invalid type for Binary column: %s", val)
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return
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}
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case typeGuid:
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switch val := val.(type) {
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case []byte:
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res.ti.Size = len(val)
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res.buffer = val
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default:
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err = fmt.Errorf("mssql: invalid type for Guid column: %s", val)
|
|
return
|
|
}
|
|
|
|
default:
|
|
err = fmt.Errorf("mssql: type %x not implemented", col.ti.TypeId)
|
|
}
|
|
return
|
|
|
|
}
|
|
|
|
func (b *Bulk) dlogf(format string, v ...interface{}) {
|
|
if b.Debug {
|
|
b.cn.sess.log.Printf(format, v...)
|
|
}
|
|
}
|