我是Cassandra的新手。我正在使用Datastax的Cassandra PHP驱动程序。我正在尝试使用多个插入创建批处理语句。鉴于表格模型:
CREATE TABLE real_time_log (
du_id int,
tag_id int,
status int,
time_stamp bigint,
value float,
PRIMARY KEY ((du_id, tag_id), status, time_stamp)
)
我试图以两种方式插入以下值:
$batch = new Cassandra\BatchStatement();
$stmt = $this->cassandraDb->prepare('insert into real_time_log'
. ' (du_id, tag_id, status, time_stamp, value) '
. 'VALUES (?, ?, ?, ?, ?)');
foreach ($curData as $cData) {
$values = explode(',', $cData);
$stmtValues = array(
'du_id' => 11111,
'tag_id' => 22222,
'status' => (int) $values[2],
'time_stamp' => new Cassandra\Bigint($values[0]),
'value' => (double) $values[1]
);
$batch->add($stmt, $stmtValues);
}
$this->cassandraDb->executeAsync($batch);
这会产生错误:
PHP Fatal error: Uncaught exception 'Cassandra\Exception\InvalidArgumentException' with message 'Invalid value type'
与此同时,我尝试了一种更直接的方法,没有准备好的陈述:
$batch = new Cassandra\BatchStatement();
foreach ($curData as $cData) {
$values = explode(',', $cData);
$stmtValues = array(
11111,
22222,
(int) $values[2],
new Cassandra\Bigint($values[0]),
(double) $values[1]
);
$batch->add(new Cassandra\SimpleStatement('insert into real_time_log'
. ' (du_id, tag_id, status, time_stamp, value) '
. 'VALUES (' . implode(',', $stmtValues) . ')'));
}
$this->cassandraDb->executeAsync($batch);
这样一切正常,但肯定会慢得多。 也许有人可以解释我正在做的准备好的陈述方法有什么问题?
提前谢谢。
答案 0 :(得分:1)
乍一看,它看起来应该有效 - 您是否尝试过明确地传递(double) $values[1]
(将new Cassandra\Float($values[1])
更改为SignInManager.SignIn(user, false, false)
)?
答案 1 :(得分:0)
我已执行此操作以插入单行,并且工作正常:
$glid = 12345;
$modid = 'mobile';
$sysdate = date("YmdHis");
$sql = "insert into user (USR_ID,modid,membersince) values (?,?,?)";
$par = array(new Cassandra\Bigint($glid),$modid,new Cassandra\Bigint($sysdate));
$statement = $db->prepare($sql);
$db->execute($statement, array(
'arguments' => $par
));