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command.go
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command.go
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package exec
import (
"fmt"
"strings"
u "github.com/araddon/gou"
"github.com/fuhongbo/qlbridge/expr"
"github.com/fuhongbo/qlbridge/lex"
"github.com/fuhongbo/qlbridge/plan"
"github.com/fuhongbo/qlbridge/rel"
"github.com/fuhongbo/qlbridge/vm"
)
var (
_ = u.EMPTY
// Ensure that we implement the Task Runner interface
_ TaskRunner = (*Command)(nil)
)
// Command is executeable task for SET SQL commands
type Command struct {
*TaskBase
p *plan.Command
}
// NewCommand creates new command exec task
func NewCommand(ctx *plan.Context, p *plan.Command) *Command {
m := &Command{
TaskBase: NewTaskBase(ctx),
p: p,
}
return m
}
// Close Command
func (m *Command) Close() error {
if err := m.TaskBase.Close(); err != nil {
return err
}
return nil
}
// Run Command
func (m *Command) Run() error {
//defer m.Ctx.Recover()
defer close(m.msgOutCh)
if m.Ctx.Session == nil {
u.Warnf("no Context.Session?")
return fmt.Errorf("no Context.Session?")
}
switch kw := m.p.Stmt.Keyword(); kw {
case lex.TokenSet:
return m.runSet()
case lex.TokenRollback, lex.TokenCommit:
u.Debugf("ignorning transaction, not implemented. %v", kw.String())
return nil
default:
u.Warnf("unrecognized command: kw=%v stmt:%s", kw, m.p.Stmt)
}
return ErrNotImplemented
}
func (m *Command) runSet() error {
writeContext, ok := m.Ctx.Session.(expr.ContextWriter)
if !ok || writeContext == nil {
u.Warnf("expected context writer but no for %T", m.Ctx.Session)
return fmt.Errorf("No write context?")
}
//u.Debugf("running set? %v", m.p.Stmt.String())
for _, col := range m.p.Stmt.Columns {
err := evalSetExpression(col, m.Ctx.Session, col.Expr)
if err != nil {
u.Warnf("Could not evaluate [%s] err=%v", col.Expr, err)
return err
}
}
// for k, v := range m.Ctx.Session.Row() {
// u.Infof("%p session? %s: %v", m.Ctx.Session, k, v.Value())
// }
return nil
}
func evalSetExpression(col *rel.CommandColumn, ctx expr.ContextReadWriter, arg expr.Node) error {
switch bn := arg.(type) {
case *expr.BinaryNode:
_, ok := bn.Args[0].(*expr.IdentityNode)
if !ok {
u.Warnf("expected identity but got %T in %s", bn.Args[0], arg.String())
return fmt.Errorf("Expected identity but got %T", bn.Args[0])
}
rhv, ok := vm.Eval(ctx, bn.Args[1])
if !ok {
u.Warnf("expected right side value but got %T in %s", bn.Args[1], arg.String())
return fmt.Errorf("Expected value but got %T", bn.Args[1])
}
//u.Infof(`writeContext.Put("%v",%v)`, col.Key(), rhv.Value())
ctx.Put(col, ctx, rhv)
case nil:
// Special statements
name := strings.ToLower(col.Name)
switch {
case strings.HasPrefix(name, "names ") || strings.HasPrefix(name, "character set"):
// http://dev.mysql.com/doc/refman/5.7/en/charset-connection.html
// hm, no idea what to do
/*
SET character_set_client = charset_name;
SET character_set_results = charset_name;
SET character_set_connection = charset_name;
*/
}
default:
u.Errorf("SET command only accepts binary nodes but got type: %#v", arg)
return fmt.Errorf("Un recognized command %T", arg)
}
return nil
}