ResponseError : 预期的 4 或 0 字节 int [英] ResponseError : Expected 4 or 0 byte int

问题描述

我正在尝试 cassandra 节点驱动程序并在插入记录时遇到问题，看起来 cassandra 驱动程序无法插入浮点值.

I am trying cassandra node driver and stuck in problem while inserting a record, it looks like cassandra driver is not able to insert float values.

Problem: When passing int value for insertion in db, api gives following error:
    Debug: hapi, internal, implementation, error 
        ResponseError: Expected 4 or 0 byte int (8)
        at FrameReader.readError (/home/gaurav/Gaurav-Drive/code/nodejsWorkspace/cassandraTest/node_modules/cassandra-driver/lib/readers.js:291:13)
        at Parser.parseError (/home/gaurav/Gaurav-Drive/code/nodejsWorkspace/cassandraTest/node_modules/cassandra-driver/lib/streams.js:185:45)
        at Parser.parseBody (/home/gaurav/Gaurav-Drive/code/nodejsWorkspace/cassandraTest/node_modules/cassandra-driver/lib/streams.js:167:19)
        at Parser._transform (/home/gaurav/Gaurav-Drive/code/nodejsWorkspace/cassandraTest/node_modules/cassandra-driver/lib/streams.js:101:10)
        at Parser.Transform._read (_stream_transform.js:179:10)
        at Parser.Transform._write (_stream_transform.js:167:12)
        at doWrite (_stream_writable.js:225:10)
        at writeOrBuffer (_stream_writable.js:215:5)
        at Parser.Writable.write (_stream_writable.js:182:11)
        at write (_stream_readable.js:601:24)

我正在尝试从代码执行以下查询:

I am trying to execute following query from code:

INSERT INTO ragchews.user
(uid ,iid ,jid ,jpass ,rateCount ,numOfratedUser ,hndl ,interests ,locX ,locY ,city )
VALUES
('uid_1',{'iid1'},'jid_1','pass_1',25, 10, {'NEX1231'}, {'MUSIC'}, 21.321, 43.235, 'delhi');

传递给execute()的参数是

var params = [uid, iid, jid, jpass, rateCount, numOfratedUser, hndl, interest, locx, locy, city];

哪里

var locx = 32.09;
var locy = 54.90;

并调用执行看起来像:

var addUserQuery = 'INSERT INTO ragchews.user (uid ,iid ,jid ,jpass ,rateCount ,numOfratedUser ,hndl ,interests ,locX ,locY ,city) VALUES (?,?,?,?,?,?,?,?,?,?,?);';
var addUser = function(user, cb){
    console.log(user);
    client.execute(addUserQuery, user, function(err, result){
        if(err){
            throw err;
        }
        cb(result);
    });
};

CREATE TABLE ragchews.user( 
    uid varchar,    
    iid set<varchar>,   
    jid varchar,    
    jpass varchar,  
    rateCount int,  
    numOfratedUser int, 
    hndl set<varchar>,  
    interests set<varchar>, 
    locX float, 
    locY float, 
    city varchar,   
    favorite map<varchar, varchar>, 
    PRIMARY KEY(uid)
);

附言在尝试理解问题时的一些观察:

P.S Some observations while trying to understand the issue:

1. 看起来，问题出在 float 上，所以我将 float(locX、locY)类型更改为 int 并重新运行代码.同样的错误仍然存​​在.因此，这不是与浮点 CQL 类型相关的问题.
2. 接下来，我尝试从 INSERT 查询中删除所有 int 并尝试仅插入非数字值.这次尝试成功地将值输入到 db 中.因此现在看起来，这个问题可能与数字类型有关.

推荐答案

以下文字摘自 cassandra 节点驱动程序数据类型文档

在编码数据时，在带参数的正常执行中，驱动程序尝试根据输入类型猜测目标类型.Number 类型的值将被编码为 double(因为 Number 是 double/IEEE 754 值).

When encoding data, on a normal execute with parameters, the driver tries to guess the target type based on the input type. Values of type Number will be encoded as double (as Number is double / IEEE 754 value).

考虑以下示例:

var key = 1000;
client.execute('SELECT * FROM table1 where key = ?', [key], callback);

如果键列是 int 类型，则执行失败.有两种可能的方法可以避免此类问题:

If the key column is of type int, the execution fails. There are two possible ways to avoid this type of problem:

1. 准备数据(推荐) - 在执行前准备查询

1. Prepare the data (recommended) - prepare the query before execution

client.execute('SELECT * FROM table1 where key = ?', [key], { prepare : true }, callback);

提示目标类型 - 提示:第一个参数是一个整数`

Hinting the target types - Hint: the first parameter is an integer`

client.execute('SELECT * FROM table1 where key = ?', [key], { hints : ['int'] }, callback);

如果您正在处理批量更新，那么这个问题 可能是您的兴趣所在.

If you are dealing with batch update then this issue may be of your interest.

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