func (c *ClientConn) limitSelectResult(r *mysql.Resultset, stmt *sqlparser.Select) error {
if stmt.Limit == nil {
return nil
}
var offset, count int64
var err error
if stmt.Limit.Offset == nil {
offset = 0
} else {
if o, ok := stmt.Limit.Offset.(sqlparser.NumVal); !ok {
return fmt.Errorf("invalid select limit %s", nstring(stmt.Limit))
} else {
if offset, err = strconv.ParseInt(hack.String([]byte(o)), 10, 64); err != nil {
return err
}
}
}
if o, ok := stmt.Limit.Rowcount.(sqlparser.NumVal); !ok {
return fmt.Errorf("invalid limit %s", nstring(stmt.Limit))
} else {
if count, err = strconv.ParseInt(hack.String([]byte(o)), 10, 64); err != nil {
return err
} else if count < 0 {
return fmt.Errorf("invalid limit %s", nstring(stmt.Limit))
}
}
if offset+count > int64(len(r.Values)) {
count = int64(len(r.Values)) - offset
}
r.Values = r.Values[offset : offset+count]
r.RowDatas = r.RowDatas[offset : offset+count]
return nil
}
func (c *ClientConn) dispatch(data []byte) error {
cmd := data[0]
data = data[1:]
switch cmd {
case mysql.COM_QUIT:
c.Close()
return nil
case mysql.COM_QUERY:
return c.handleQuery(hack.String(data))
case mysql.COM_PING:
return c.writeOK(nil)
case mysql.COM_INIT_DB:
if err := c.useDB(hack.String(data)); err != nil {
return err
} else {
return c.writeOK(nil)
}
case mysql.COM_FIELD_LIST:
return c.handleFieldList(data)
case mysql.COM_STMT_PREPARE:
return c.handleStmtPrepare(hack.String(data))
case mysql.COM_STMT_EXECUTE:
return c.handleStmtExecute(data)
case mysql.COM_STMT_CLOSE:
return c.handleStmtClose(data)
case mysql.COM_STMT_SEND_LONG_DATA:
return c.handleStmtSendLongData(data)
case mysql.COM_STMT_RESET:
return c.handleStmtReset(data)
default:
msg := fmt.Sprintf("command %d not supported now", cmd)
return mysql.NewError(mysql.ER_UNKNOWN_ERROR, msg)
}
return nil
}