schema

peewee - modify db model meta (e.g. schema) dynamically

由 ╄→尐↘猪︶ㄣ 提交于 2020-12-13 03:46:10
问题 In order to insert same data to same set of tables in different schemas (data about the mobile application where app id is primary key but app is cross-platform and exists on different platforms. Schema per platfrom so pp id does not interfere for tables with it as fk). I already has some infrastructure for it and I wasn't expecting this requirement. For me I see the easiest way is having existing model class binded to some db+schema_1+table_name insert data to first schema then somehow

Liquibase & Spring how to use separate user for schema changes

由 可紊 提交于 2020-12-01 11:46:26
问题 I'm looking into Liquibase as a potential solution to deploy my web application using pre-existing database servers (of different types). This application should access the database with a user that can only manipulate data, I would like to use a different user as schema owner. Since my application uses Spring I thought I could use the integration class, though it would mean I have to create a second datasource which will remain opened for as long as my application runs which defeats the

XML Schema

由 空扰寡人 提交于 2020-11-30 20:36:29
XML Schema的作用是定义一份XML文档的合法组件群，就像DTD的作用一样,一份XML Schema： 定义了可以出现在文档里的元素 ； 定义了可以出现在文档里的属性 ； 定义了哪些元素是子元素 ； 定义了子元素的顺序 ； 定义了子元素的数量 ； 定义了一个元素应是否能包含文本，或应该是空的 ； 定义了元素和属性的数据类型 ； 定义了元素和属性的默认值和固定值 ； 继承性 我们认为XML Schema很快就会替代DTD在大多数的网络应用程序中被广泛使用。 XML Schema针对将来的额外内容是可扩展的 ； XML Schema内容比DTD丰富，作用也更大 ； XML Schema是以XML语言编写而成的 ； XML Schema支持 数据类型 ； XML Schema支持名称空间（namespaces）； 来源： oschina 链接： https://my.oschina.net/u/861562/blog/151297

Creating new table with cqlsh on existing keyspace: Column family ID mismatch

由 跟風遠走 提交于 2020-11-30 06:20:31
问题 Houston, we have a problem. Trying to create a new table with cqlsh on an existing Cassandra (v2.1.3) keyspace results in: ServerError: <ErrorMessage code=0000 [Server error] message="java.lang.RuntimeException: java.util.concurrent.ExecutionException: java.lang.RuntimeException: org.apache.cassandra.exceptions.ConfigurationException: Column family ID mismatch (found e8c03790-c952-11e4-a753-5981ea73cd7c; expected e8b14370-c952-11e4-a844-8f10bfb9c386)"> After the first create attempt, trying

How to create schema containing list of objects using Avro?

由 寵の児 提交于 2020-11-30 02:59:45
问题 Does anyone knows how to create Avro schema which contains list of objects of some class? I want my generated classes to look like below : class Child { String name; } class Parent { list<Child> children; } For this, I have written part of schema file but do not know how to tell Avro to create list of objects of type Children ? My schema file looks like below : { "name": "Parent", "type":"record", "fields":[ { "name":"children", "type":{ "name":"Child", "type":"record", "fields":[ {"name":

Oracle 常用的函数小结

由 谁说胖子不能爱 提交于 2020-11-10 03:58:11
1 Oracle 常用函数 1.1 字符函数 函数名 函数作用 备注 Lower(char) 使字符串char大写 Upper(char) 使字符串char小写 Length(char) 计算字串char长度 Substr(char,m,n) 将字串char从m截取n个字符 || 连接字符串 相当于java种的”+” Repace(char,char1,char2) 将字串char种的char1替换为char2 Ascii(char) 返回char的ascii码 互相逆 Char(number) 根据number返回字符 Concat(char1,char2) 等同char1||char2 Initcap(char) 将char字串的单词首字母大写其他字母小写 Instr(c1,c2,i,j) 从c1的i位置开始查找第j次出现的c2的位置 i为负数则从右到左查找.i和j默认值都是1 Ltrim(c1,c2) 使c1字串的开头字母不在c2中 Decode(value,value1,result,result1) Value和value1对比,相等返回result,否则返回result1 Value1对应result..这两个值可以连续出现..匹配..其实也就是case语句..但是只能匹配等价值,感觉不如case= =!! 1.2 数学函数 函数名 函数作用 备注 Round
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