76 lines
1.8 KiB
Go
76 lines
1.8 KiB
Go
package canal
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import (
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"fmt"
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"github.com/siddontang/go-mysql/replication"
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"github.com/siddontang/go-mysql/schema"
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)
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// The action name for sync.
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const (
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UpdateAction = "update"
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InsertAction = "insert"
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DeleteAction = "delete"
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)
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// RowsEvent is the event for row replication.
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type RowsEvent struct {
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Table *schema.Table
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Action string
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// changed row list
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// binlog has three update event version, v0, v1 and v2.
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// for v1 and v2, the rows number must be even.
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// Two rows for one event, format is [before update row, after update row]
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// for update v0, only one row for a event, and we don't support this version.
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Rows [][]interface{}
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// Header can be used to inspect the event
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Header *replication.EventHeader
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}
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func newRowsEvent(table *schema.Table, action string, rows [][]interface{}, header *replication.EventHeader) *RowsEvent {
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e := new(RowsEvent)
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e.Table = table
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e.Action = action
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e.Rows = rows
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e.Header = header
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e.handleUnsigned()
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return e
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}
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func (r *RowsEvent) handleUnsigned() {
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// Handle Unsigned Columns here, for binlog replication, we can't know the integer is unsigned or not,
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// so we use int type but this may cause overflow outside sometimes, so we must convert to the really .
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// unsigned type
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if len(r.Table.UnsignedColumns) == 0 {
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return
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}
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for i := 0; i < len(r.Rows); i++ {
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for _, index := range r.Table.UnsignedColumns {
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switch t := r.Rows[i][index].(type) {
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case int8:
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r.Rows[i][index] = uint8(t)
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case int16:
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r.Rows[i][index] = uint16(t)
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case int32:
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r.Rows[i][index] = uint32(t)
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case int64:
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r.Rows[i][index] = uint64(t)
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case int:
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r.Rows[i][index] = uint(t)
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default:
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// nothing to do
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}
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}
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}
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}
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// String implements fmt.Stringer interface.
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func (r *RowsEvent) String() string {
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return fmt.Sprintf("%s %s %v", r.Action, r.Table, r.Rows)
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}
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