database db 数据库 table collection 表/集合 row document 行/文档 column field 字段 index index 索引 primaryId _id 主键 lock lock 锁 下面对以上基本概念进行简单说明，详情的后续博文会补上 1. 数据库 数据库可以理解为collection的聚集体，每个mongodb实例可以有多个 database，每个database可以有多个collection 常见的几个命令如下： 显示所有db 2. 集合 document的集合，与table最大的区别是它的结构不是固定的，不需要事先定义字段、类型首次新增document时，集合被创建； document 文档，也就是具体的数据；bson结构，kv方式 最大的特点是不要求所有的document的结构一致，相同的field的数据类型可以不一致 用于导入导出数据，如 将库 database 中的集合 collection 导出到json文件 out.json bin/mongoexport -h localhost:27107 -u user -p pwd -d database -c collection -o out.json 从json文件导入到目标集合 new_collection bin/mongoimport -h localhost:27107

sinceActive tillStateDescription□One timeWith data collection2015-01-12 00:002015-01-13 00:00Active Internal items previously were not processed if a host went into maintenance with 'no data collection'. Now internal items are always processed by server or proxy regardless of host maintenance gateway distribution Regardless of how you obtained Java gateway, you should have ended up with a collection of shell scripts, JAR and configuration files under $PREFIX/sbin/zabbix_java. The role of these

11 Settings 120 3.12 Exceptions 150 4 Built-in services 153 4.1 Logging 153 4.2 Stats Collection 159 4.3 Sending e-mail 161 4.4 Telnet Console 163 4.5 Web Service 166 5 Solving specific avoid using .//text() and use just instead. This is because the expression .//text() yields a collection of text elements – a node-set. And when a node-set is converted to a string, which happens when Scrapy only provides the mechanism; it doesn’t impose any specific organization of your Loaders collection - that’s up to you and your project’s needs. ### 3.6 Scrapy shell The Scrapy shell is an interactive

353 27.4 C Wrapper Examples ..... 355 27.5 Fortran Wrapper Example ..... 356 27.6 Garbage Collection Safety ..... 357 27.7 Non-constant Function Specifications ..... 357 27.8 Indirect Calls . EscapeAnalysis 1603 102.24 Static analyzer annotations for GC correctness in C code 1615 102.25 Garbage Collection in Julia 1621 103 Developing/debugging Julia's C code 1623 103.1 Reporting and analyzing complete collection of basic arithmetic and bitwise operators across all of its numeric primitive types, as well as providing portable, efficient implementations of a comprehensive collection of standard

353 27.4 C Wrapper Examples ..... 355 27.5 Fortran Wrapper Example ..... 356 27.6 Garbage Collection Safety ..... 357 27.7 Non-constant Function Specifications ..... 357 27.8 Indirect Calls . EscapeAnalysis 1604 102.24 Static analyzer annotations for GC correctness in C code 1616 102.25 Garbage Collection in Julia 1622 103 Developing/debugging Julia's C code 1624 103.1 Reporting and analyzing complete collection of basic arithmetic and bitwise operators across all of its numeric primitive types, as well as providing portable, efficient implementations of a comprehensive collection of standard

application performance. See the Improve Your Application's Performance for how to do this. ## Collection • Added unique() which filters out duplicate value specified by provided callback. • reject() CakePHP's models are composed of Table and Entity objects. Table objects provide access to the collection of entities stored in a specific table. They are stored in src/Model/Table. The file we'll add this use statement right below the namespace declaration to import // the Collection class use Cake\Collection\Collection; // Update the accessible property to contain 'tag_string' protected

. 189 Collection Operations Overview ..... 192 Collection Transformations ..... 194 Filtering ..... 198 plus and minus Operators ..... 201 Grouping ..... 202 Retrieving Collection Parts .. ... 203 Retrieving Single Elements ..... 206 Collection Ordering ..... 209 Collection Aggregate Operations ..... 212 Collection Write Operations 214 List Specific Operations 216 Set Specific Apache Mahout - a distributed framework for regression, clustering and recommendation — Weka - a collection of machine learning algorithms for data mining tasks If this list doesn't cover your needs

Collections Collection Quick Example ○ List of Methods ☐ Iterating Collection::each(). Collection::map(). Collection::extract(). Collection::combine(). Collection::stopWhen(). Collection::unfold() Collection::unfold(). Collection::chunk(). Collection::chunkWithKeys(). ## Filtering Collection::filter(). Collection::reject(). Collection::every(). Collection::some(). Collection::match(). Collection::firstMatch() Aggregation Collection::reduce(). Collection::min(). Collection::max(). Collection::sumOf(). Collection::avg(). Collection::median(). ■ Grouping and Counting ## ○ Sorting Collection::sortBy()

CakePHP's models are composed of Table and Entity objects. Table objects provide access to the collection of entities stored in a specific table. They are stored in src/Model/Table. The file we'll ## Collection • CollectionTrait now uses the newCollection method to create clones. This allows sub-classes to have collection methods create instances of themselves instead of using Collection. ## Console • Fallback engines can be disabled by setting fallback = false for any cache configuration. ## Collection • The appendItem(), Prepend(), PrependItems() methods were added to CollectionTrait. ## Configure

CakePHP's models are composed of Table and Entity objects. Table objects provide access to the collection of entities stored in a specific table. They are stored in src/Model/Table. The file we'll signature of any methods they do change the semantics or behavior of methods. ## Collection • Collection::groupBy() and Collection::indexBy() now throw an exception when the path does not exist or the path not change the signature of any methods they do change the semantics or behavior of methods. ## Collection • Renamed $preserveKeys parameter to $keepKeys with same implementation. ## Command • cake i18n