Esempio n. 1
0
// ExecRestrictedSQL implements SQLHelper interface.
// This is used for executing some restricted sql statements.
func (s *session) ExecRestrictedSQL(ctx context.Context, sql string) (rset.Recordset, error) {
	if ctx.Value(&sqlexec.RestrictedSQLExecutorKeyType{}) != nil {
		// We do not support run this function concurrently.
		// TODO: Maybe we should remove this restriction latter.
		return nil, errors.New("Should not call ExecRestrictedSQL concurrently.")
	}
	statements, err := Compile(ctx, sql)
	if err != nil {
		log.Errorf("Compile %s with error: %v", sql, err)
		return nil, errors.Trace(err)
	}
	if len(statements) != 1 {
		log.Errorf("ExecRestrictedSQL only executes one statement. Too many/few statement in %s", sql)
		return nil, errors.New("Wrong number of statement.")
	}
	st := statements[0]
	// Check statement for some restriction
	// For example only support DML on system meta table.
	// TODO: Add more restrictions.
	log.Debugf("Executing %s [%s]", st.OriginText(), sql)
	ctx.SetValue(&sqlexec.RestrictedSQLExecutorKeyType{}, true)
	defer ctx.ClearValue(&sqlexec.RestrictedSQLExecutorKeyType{})
	rs, err := st.Exec(ctx)
	return rs, errors.Trace(err)
}
Esempio n. 2
0
func popRowStack(ctx context.Context) error {
	s := getRowStack(ctx)

	if s == nil || len(s.items) == 0 {
		return errors.Errorf("pop empty row stack")
	}

	n := len(s.items) - 1
	s.items[n] = nil
	s.items = s.items[0:n]

	if len(s.items) == 0 {
		ctx.ClearValue(rowStackKey)
		return nil
	}

	ctx.SetValue(rowStackKey, s)
	return nil
}
Esempio n. 3
0
func (sq *SubQuery) pop(ctx context.Context) error {
	v := ctx.Value(subQueryStackKey)
	if v == nil {
		return errors.Errorf("pop empty sub query stack")
	}

	st := v.([]*SubQuery)

	// can not empty
	n := len(st) - 1
	if st[n] != sq {
		return errors.Errorf("pop invalid top sub query in stack, want %v, but top is %v", sq, st[n])
	}

	st[n] = nil
	st = st[0:n]
	if len(st) == 0 {
		ctx.ClearValue(subQueryStackKey)
		return nil
	}

	ctx.SetValue(subQueryStackKey, st)
	return nil
}
Esempio n. 4
0
File: stmt.go Progetto: rorovic/tidb
// ClearExecArgs clears executive args from context.
func ClearExecArgs(ctx context.Context) {
	ctx.ClearValue(execArgsKey)
}
Esempio n. 5
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// ClearBinlog clears binlog in the Context.
func ClearBinlog(ctx context.Context) {
	ctx.ClearValue(binlogKey)
}