Cassandra数据库模糊查询

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前言

• 操作系统win10
• 时间2019年02月
• Python版本：Python 3.5.2
• Cassandra版本：cassandra 3.11.3
• 参考网址1
• 参考网址2

安装Cassandra

安装Cassandra数据库

1. 官网下载Cassandra压缩包
2. 解压，并配置环境变量：

操作	变量名	变量值
新建	CASSANDRA_HOME	解压路径
增加	PATH	解压路径\bin;

测试

C:\Users\wahaha>cassandra

准备一张表和若干记录

创建一张表

cqlsh> create table test.user (name text primary key, age int, email text)
cqlsh>

插入若干记录

cqlsh> insert into test.user (name, age, email) values ('aaa', 20, '[email protected]');
cqlsh> insert into test.user (name, age, email) values ('no_aaa', 21, '[email protected]');
cqlsh> insert into test.user (name, age, email) values ('bbb', 22, '[email protected]');
cqlsh> insert into test.user (name, age, email) values ('no_bbb', 21, '[email protected]');
cqlsh> insert into test.user (name, age, email) values ('ccc', 23, '[email protected]');
cqlsh>

查询所有记录

cqlsh> select * from test.user;

 name   | age | email
--------+-----+---------------
 no_aaa |  21 | [email protected]
    aaa |  20 |    [email protected]
    bbb |  22 |    [email protected]
    ccc |  23 |    [email protected]
 no_bbb |  21 | [email protected]

(5 rows)
cqlsh>

模糊查询1（疑问）

对某一列进行配置

需要对哪一列进行模糊查询，例如，本文就对email列进行模糊查询
本次配置可以模糊查询以xx字符开头的记录
疑问：无法对设置为primary key的字段进行模糊查询配置

 cqlsh> create custom index user_name_idx ON test.user (name) USING 'org.apache.cassandra.index.sasi.SASIIndex' WITH OPTIONS = {'analyzer_class': 'org.apache.cassandra.index.sasi.analyzer.StandardAnalyzer', 'case_sensitive': 'false'};
InvalidRequest: Error from server: code=2200 [Invalid query] message="Cannot create secondary index on partition key column name"
cqlsh>

模糊查询2

对某一列进行配置

需要对哪一列进行模糊查询，例如，本文就对email列进行模糊查询
本次配置可以模糊查询以xx字符开头的记录

cqlsh> create custom index user_email_idx ON test.user (email) USING 'org.apache.cassandra.index.sasi.SASIIndex' WITH OPTIONS = {'analyzer_class': 'org.apache.cassandra.index.sasi.analyzer.StandardAnalyzer', 'case_sensitive': 'false'};
cqlsh>

测试模糊查询

模糊查询email字段以no开头的所有记录

cqlsh> select * from test.user where email like 'no%';

 name   | age | email
--------+-----+---------------
 no_aaa |  21 | [email protected]
 no_bbb |  21 | [email protected]

(2 rows)
cqlsh>

模糊查询3

对某一列进行配置

需要对哪一列进行模糊查询，例如，本文就对email列进行模糊查询
本次配置可以模糊查询包含xx字符的记录

cqlsh> create custom index user_email_idx ON test.user (email) USING 'org.apache.cassandra.index.sasi.SASIIndex' WITH OPTIONS = {'mode': 'CONTAINS', 'analyzer_class': 'org.apache.cassandra.index.sasi.analyzer.StandardAnalyzer', 'case_sensitive': 'false'};
cqlsh>

测试模糊查询

模糊查询email字段包含aaa的所有记录

cqlsh> select * from test.user where email like '%aaa';

 name   | age | email
--------+-----+---------------
 no_aaa |  21 | [email protected]
    aaa |  20 |    [email protected]

(2 rows)
cqlsh>

转载于:https://www.cnblogs.com/yun1233/p/10388047.html