前言：
clickhouse的安装见
https://blog.csdn.net/weixin_41463944/article/details/142534145?spm=1001.2014.3001.5501
1、需要在路径/etc/clickhouse-serve下定义*_dictionary.xml结尾的配置文件
2、需要准备organization.csv和sales.csv本地测试文件（注意不是windows下的xlsx表格，是linux下的文件）
2.1 organization.csv文件
1,"a0001","研发部"
2,"a0002","产品部"
3,"a0003","数据部"
4,"a0004","测试部"
5,"a0005","运维部"
6,"a0006","规划部",
7,"a0007","市场部"
2.2 sales.csv文件
1,2016-01-01,2017-01-10,100
2,2016-05-01,2017-07-01,200
3,2014-03-05,2018-01-20,300
4,2018-08-01,2019-10-01,400
5,2017-03-01,2017-06-01,500
6,2017-04-09,2018-05-30,600
7,2018-06-01,2019-01-25,700
8,2019-08-01,2019-12-12,800
3、关于每个xml字典文件的格式
<?xml version="1.0"?>
<dictionaries><dictionary><name>字典名称（全局唯一）</name><source>数据源配置</source><layout>字典数据在内存中的格式</layout><structure>字典的数据结构</structure><lifetime>字典的自动更新频率<min>300</min><max>360</max></lifetime></dictionary>
</dictionaries>
4、关于扩展字典的几种类型配置
一共7种类型，其中flat、hashed、sparse_hashed、range_hashed、cache的主键为数值型UInt64类型的，其他类型如complex_key_hashed、complex_key_cache为复合类型的key
4.1）flat类型的字典，在/etc/clickhouse-serve目录下新建test_flat_dictionary.xml
<?xml version="1.0"?>
<dictionaries><dictionary><name>test_flat_dict</name><source><file><path>/home/clickhouse-server/etc/clickhouse-server/dictionary/organization.csv</path><format>CSV</format></file></source><layout><flat/></layout><structure><id><name>id</name></id><attribute><name>code</name><type>String</type><null_value></null_value></attribute><attribute><name>name</name><type>String</type><null_value></null_value></attribute></structure><lifetime><min>300</min><max>360</max></lifetime></dictionary>
</dictionaries>
4.2）hashed类型的字典，在/etc/clickhouse-serve目录下新建test_hashed_dictionary.xml
<?xml version="1.0"?>
<dictionaries><dictionary><name>test_hashed_dict</name><source><file><path>/home/clickhouse-server/etc/clickhouse-server/dictionary/organization.csv</path><format>CSV</format></file></source><layout><hashed/></layout><structure><id><name>id</name></id><attribute><name>code</name><type>String</type><null_value></null_value></attribute><attribute><name>name</name><type>String</type><null_value></null_value></attribute></structure><lifetime><min>300</min><max>360</max></lifetime></dictionary>
</dictionaries>
4.3）complex_key_hashed类型的字典，在/etc/clickhouse-serve目录下新建complex_key_hashed_dictionary.xml
<?xml version="1.0"?>
<dictionaries><dictionary><name>test_complex_key_hashed_dict</name><source><file><path>/home/clickhouse-server/etc/clickhouse-server/dictionary/organization.csv</path><format>CSV</format></file></source><layout><complex_key_hashed/></layout><structure><key><attribute><name>id</name><type>UInt64</type></attribute><attribute><name>code</name><type>String</type></attribute></key><attribute><name>name</name><type>String</type><null_value></null_value></attribute></structure><lifetime><min>300</min><max>360</max></lifetime></dictionary>
</dictionaries>
4.4）range_hashed类型的字典，在/etc/clickhouse-serve目录下新建test_range_hashed_dictionary.xml
<?xml version="1.0"?>
<dictionaries><dictionary><name>test_range_hashed_dict</name><source><file><path>/home/clickhouse-server/etc/clickhouse-server/dictionary/sales.csv</path><format>CSV</format></file></source><layout><range_hashed/></layout><structure><id><name>id</name></id><range_min><name>start</name></range_min><range_max><name>end</name></range_max><attribute><name>price</name><type>Float32</type><null_value></null_value></attribute></structure><lifetime><min>300</min><max>360</max></lifetime></dictionary>
</dictionaries>
5、关于字典的数据源
5.1 文件类型，格式通常为CSV或者TabSeparated
1）本地文件
<source><file><path>/home/clickhouse-server/etc/clickhouse-server/dictionary/organization.csv</path><format>CSV</format></file></source>2）可执行文件
<source><executable><command>/home/clickhouse-server/etc/clickhouse-server/dictionary/organization.csv</command><format>CSV</format></executable></source>3）远程文件
<source><http><url>xxxxx.csv</url><format>CSV</format></http></source>5.2 数据库类型的数据源
1）mysql
<source><mysql><port>3306</port><user>xxxx</user><password>xxxx</password><replica><host>localhost</host><priority>1</priority></replica><db>db_mybatis</db><table>userList</table></mysql></source>其中<mysql> 标签的下一级可添加 <where>is_deleted=0</where>做为筛选条件
2）clickhouse
<source><clickhouse><host>localhost</host><port>9000</port><user>xxxx</user><password>xxxxx</password><db>my_database</db><table>test_table</table></clickhouse></source>
6、关于DDL语句
dictGet(‘字典名称’,‘字典的具体字段’,‘key键值’)，如果字典为复合key的话，则在字典函数中的key用元组tuple(‘a’,‘b’,‘c’)表示
7、关于手动刷新数据字典
7.1 ）全局字典刷新
system reload dictionaries
7.2）刷新单个字典（字典名称不加单引号）
system reload dictionary test_mysql_dict
