db2

db2 equivalent of MySql REPLACE INTO

由 牧云@^-^@ 提交于 2019-12-23 20:09:05
问题 I very useful statement I like of MySql is REPLACE INTO table that is 'REPLACE a value if-exist OR INSERT INTO table If-Not-Exist'. The documentation of db2 REPLACE is for a function operating on strings only so not with that meaning. Is there any equivalent in db2? Right now I am looking also for keywords IF EXSTS/IF NOT EXIST . 回答1: DB2 uses the SQL standard MERGE statement to do basically the same thing. The syntax is different: MERGE INTO table_to_upsert AS tab USING (VALUES (1, 2, 3), (4

Maven 中<optional>true</optional>和<scope>provided</scope>之间的区别

由 女生的网名这么多〃 提交于 2019-12-23 18:16:34
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 依赖管理是maven提供的主要功能之一。无论我们需要什么依赖，我们只需将它们添加到POM.xml中。由于maven，所有必要的类和资源都会自动添加到项目的classpath中。 在添加依赖项时，我们可以使用optional标志，或将scope设置为“provided”。在这两种情况下，依赖关系都将在声明它们的模块的classpath中，但是使用将它们定义为依赖关系的模块不会在其他项目中传递它们，即不会形成依赖传递。 从语义来上理解 optional 可选的，可以理解为此功能/此依赖可选，如果不需要某项功能，可以不引用这个包。 scope provided 提供的，可以理解为此包不由我直接提供，需要调用者/容器提供。 举个例子说明二者的使用场景和区别 optional 现开发了一个类似Hibernate的框架，叫Summer吧，致敬下Spring，提供了多种数据库方言的支持:mysql/oracle/db2/postgresql... 每种数据库支持也独立了一个module，Summer的依赖中配置了每种数据库的支持包：summer-mysql-support/summer-oracle-support... 但是实际引用此框架/依赖时，并不需要所有数据库方言的支持。此时可以把数据库的支持包都配置为可选的

connecting to DB2 database:[unixODBC][Driver Manager]Driver's SQLAllocHandle on SQL_HANDLE_HENV failed

由 牧云@^-^@ 提交于 2019-12-23 16:51:45
问题 odbc.ini: [DEFAULT] Driver = DB2 [abc] Driver = DB2 [dsn_test1] DESCRIPTION = Connection to DB2 Driver = db2 odbcinst.ini: [DB2] Description = DB2 Driver Driver = /home/user/sqllib/lib/libdb2.so fileusage=1 dontdlclose=1 [ODBC] Trace=1 TraceFile=/home/user/sqllib/trace.out db2cli.ini [abc] hostname="hostname" pwd="passwd" port="port" PROTOCOL=TCPIP database="dbname" uid="uid" $ ./isql abc +---------------------------------------+ | Connected! | | | | sql-statement | | help [tablename] | |

pureXML的技术应用及展望

由 不打扰是莪最后的温柔 提交于 2019-12-23 13:42:44
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> pureXML技术及混合型数据库的出现，超越了关系型数据库固有的局限性，为数据库的应用及开发开辟了新的领域。其意义不仅仅是提供了一种存储XML数 据的更有效的方式，可用于广泛使用XML数据的各类领域，同时由于pureXML所代表的层次型数据组织方式，使得我们有了两种关系型和层次型两种数据建 模的方法，即使是对于传统非XML的关系型数据，在某些情况下将传统关系型的数据转化为层次型存储也将带来巨大的业务价值。 从对现有XML数据管理的应用看，pureXML技术的价值是非常明显的。如在书籍出版领域，W3C已经制定了各类数据的规范，今天很多这个领域的数据就 是以XML的形式存在。但是如何提供有效的存储方式，以及准确高效的数据查询方式却始终是关系型数据库的一个挑战。以图书为例，任何书籍的信息有部分结构 化的成分，但是书籍内容的差异性太大，很难用一种统一的结构化的体系进行描述。另一方面，基于各类书籍文章的结构，提供精确地信息查询和搜索又有重要的应 用价值。传统关系型数据库很难对书籍XML数据建模，更难以提供准确的查询和搜索。往往只能用全文检索的模式提供一些简单的功能。而采用pureXML技 术，任何书籍XML信息可以直接存储在数据库中，无需复杂建模。由于XML的自描述能力，一旦数据以XML对象存储

How to write a query to ensure email contains @

由 我是研究僧i 提交于 2019-12-23 10:16:50
问题 I'm creating a database in db2 and I want to add a constrain to validate whether the user inserting a valid email address, that contain %@%.% . Without luck...any advice? 回答1: You can use LIKE with wildcards. See here for the wildcards on DB2. The underscore character ( _ ) represents any single character. The percent sign character (%) represents a string of zero or more characters. SELECT email FROM YourTable WHERE email NOT LIKE '%_@__%.__%' This will ignore the following cases (simple

Which statistics is calculated faster in SAS, proc summary?

由 南楼画角 提交于 2019-12-23 10:15:12
问题 I need a theoretical answer. Imagine that you have a table with 1.5 billion rows (the table is created as column-based with DB2-Blu). You are using SAS and you will do some statistics by using Proc Summary like min/max/mean values, standard deviation value and percentile-10, percentile-90 through your peer-groups. For instance, you have 30.000 peer-groups and you have 50.000 values in each peer group (Total 1.5 billions values). The other case you have 3 million peer-groups and also you have

Select and Group by together

由 纵然是瞬间 提交于 2019-12-23 10:04:25
问题 I have my query like this: Select a.abc, a.cde, a.efg, a.agh, c.dummy p.test max(b.this) sum(b.sugar) sum(b.bucket) sum(b.something) followed by some outer join and inner join. Now the problem is when in group by group by a.abc, a.cde, a.efg, a.agh, c.dummy, p.test The query works fine. But if I remove any one of them from group by it gives: SQLSTATE: 42803 Can anyone explain the cause of this error? 回答1: Generally, any column that isn't in the group by section can only be included in the

sufficient page size does not exist - DB2 insert

由 坚强是说给别人听的谎言 提交于 2019-12-23 09:31:32
问题 I am having a DB2 query(simple insert statement) which is trying to insert some 27 columns. Out of those columns 1 is Clob and the issue is there. For my Clob column, sometimes the value might even contain 28K characters. And in such extreme cases, I am getting the below error, A system temporary table space with sufficient page size does not exist .. SQLCODE=-1585, SQLSTATE=54048, DRIVER=3.64.82 As I googled and gone through some pages, there is an entity called System Temporary Table Space

Referring to Code in IBM.Data.DB2 makes that Assembly Unavailable to the rest of my Solution

由 被刻印的时光 ゝ 提交于 2019-12-23 08:47:17
问题 I have a C# console application with three assemblies: Main , Common and Utilities . In a file in the Main assembly, Main.cs , I have the line: using Utilities; In a directory within the Common assembly, I have the DLL IBM.Data.DB2.dll . In the Utilities assembly, I have a source module which accesses said dll . Utilities have a Reference to IBM.Data.DB2 . In a source file within this assembly, Util.cs , I have the line: using IBM.Data.DB2; If, within a method in this file, I make any

Adding a static value to the results of an SQL query

由 岁酱吖の 提交于 2019-12-23 06:49:27
问题 I'm wondering if there is a way to accomplish this with an SQL query. I have a table, lets call it "LISTOFTHINGS" that has two fields of interest "ID" and "NAMEOFTHING" What I want to do is construct a query such that what gets returned is the results of this query: SELECT ID, NAMEOFTHING FROM LISTOFTHINGS ORDER BY NAMEOFTHING and adds a row before the first row of the above query that has " -1, 'ALL THINGs' " as the values. So if the table has the following three entries: 1, 'THING 1' 3,
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