QtCassandra 程序2

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最新推荐文章于 2025-07-12 22:23:24 发布

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本文介绍了一个使用QtCassandra库创建、配置并管理Cassandra上下文的示例。该示例展示了如何设置复制策略、复制因子及表级别的各项配置。

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/*
* Text:
*      context_management.cpp
*
* Description:
*      Create contexts, check that they exist, drop contexts, check that
*      they were removed.
*
* Documentation:
*      Run with no options.
*      Fails if the test cannot find the expected contexts or can find
*      the non-expected contexts.
*
* License:
*      Copyright (c) 2011 Made to Order Software Corp.
*
*      http://snapwebsites.org/
*      contact@m2osw.com
*
*      Permission is hereby granted, free of charge, to any person obtaining a
*      copy of this software and associated documentation files (the
*      "Software"), to deal in the Software without restriction, including
*      without limitation the rights to use, copy, modify, merge, publish,
*      distribute, sublicense, and/or sell copies of the Software, and to
*      permit persons to whom the Software is furnished to do so, subject to
*      the following conditions:
*
*      The above copyright notice and this permission notice shall be included
*      in all copies or substantial portions of the Software.
*
*      THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
*      OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
*      MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
*      IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
*      CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
*      TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
*      SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

#include <QtCassandra/QCassandra.h>
#include <QtCore/QDebug>
#include <thrift-gencpp-cassandra/cassandra_types.h>

int main(int argc, char *argv[])
{
QtCassandra::QCassandra cassandra;

cassandra.connect();
qDebug() << "Working on Cassandra Cluster Named" << cassandra.clusterName();

    QSharedPointer<QtCassandra::QCassandraContext> context(cassandra.context("qt_cassandra_test_context"));
    context->setStrategyClass("org.apache.cassandra.locator.SimpleStrategy"); // default is LocalStrategy
    //context->setDurableWrites(false); // by default this is 'true'
    context->setReplicationFactor(1); // by default this is undefined

    QSharedPointer<QtCassandra::QCassandraTable> table(context->table("qt_cassandra_test_table"));
    //table->setComment("Our test table.");
    table->setColumnType("Standard"); // Standard or Super
    table->setKeyValidationClass("BytesType");
    table->setDefaultValidationClass("BytesType");
    table->setComparatorType("BytesType");
    table->setKeyCacheSavePeriodInSeconds(14400);
    table->setMemtableFlushAfterMins(60);
    //table->setMemtableThroughputInMb(247);
    //table->setMemtableOperationsInMillions(1.1578125);
    table->setGcGraceSeconds(864000);
    table->setMinCompactionThreshold(4);
    table->setMaxCompactionThreshold(22);
    table->setReplicateOnWrite(1);

    // Column definitions can be used to make sure the content is valid.
    // It is also required if you want to index on such and such column
    // using the internal Cassandra indexing mechanism.
    QSharedPointer<QtCassandra::QCassandraColumnDefinition> column1(table->columnDefinition("qt_cassandra_test_column1"));
    column1->setValidationClass("UTF8Type");

QSharedPointer<QtCassandra::QCassandraColumnDefinition> column2(table->columnDefinition("qt_cassandra_test_column2"));
column2->setValidationClass("IntegerType");

    try {
        context->create();
        qDebug() << "Done!";
    }
    catch(org::apache::cassandra::InvalidRequestException& e) {
        qDebug() << "Exception is [" << e.why.c_str() << "]";
    }

// now that it's created, we can access it with the [] operator
QtCassandra::QCassandraTable& t(cassandra["qt_cassandra_test_context"]["qt_cassandra_test_table"]);

context->drop();
}

// vim: ts=4 sw=4 et