db2

问题 I used java process run a external command. This command is .bat file with some db2 commands. When I want use the process waiffor() return a result, I can't get anything. The program must be block. java code: ..... Runtime rt = Runtime.getRuntime(); Process p = null; String command = "db2cmd -c -w -i C:/import1.bat"; p = rt.exec(command); p.waitFor(); ..... import1.bat: @echo off db2 connect to text_DB user text using tesxt0114 db2 IMPORT FROM "C:\MVCMSInputFiles\IIS20121224180129.csv" OF DEL

问题 I am stuck into a situation where I need to insert data into a blob column by reading a file from the Filesystem in DB2 (DB2 Express C on Windows 7). Somewhere on the internet I found this INSERT INTO ... VALUES ( ..., readfile('filename'), ...); but here readfile is not an inbuilt function but I need to create it using UDF (c language libraries), but that might not be a useful solution. Can somebody update us how to insert BLOB values using Insert command. 回答1: 1) You could use LOAD or

问题 What does "CHAR(1)" in a UTF-8 encoded DB2 database mean? Can I insert a special character (e.g. one that takes 2 octets in UTF-8) into a column of CHAR(1)? Or does CHAR(1) in UTF-8 always mean, that it has capacity for one byte / octet, i.e. such that inserting an Umlaut into it will fail ? I read through this interesting developerWorks article, but it's going to deep for my simple question... 回答1: It depends. :) DB2 introduced code units to help with designing string-typed columns that are

问题 I am getting below java exception for a SELECT statement via OpenJPA which connect to DB2 database. Can someone guide me on how to exactly find which column is a mismatch? The error code ERRORCODE=-4461 does not really elaborate much. org.apache.openjpa.persistence.PersistenceException: [jcc][t4][1092][11644][3.57.82] Invalid data conversion: Wrong result column type for requested conversion. ERRORCODE=-4461, SQLSTATE=42815 at org.apache.openjpa.jdbc.sql.DBDictionary.narrow(DBDictionary.java

问题 I have a query as below: Select price from myTable; This returns value '22.50' However, I need the format as 5.8 bytes in my program. That is my String value should be '00022.50000000' and not '22.50' Is there a way to achieve this directly in SQL ? 回答1: From docs, I think you want CHAR( DECIMAL( 22.50, 13, 8 ) ) I have no DB2 instance to play with so can't verify. These functions are not ANSI SQL, they are DB2 specific. 来源： https://stackoverflow.com/questions/9696496/decimal-formatting-in

问题 My DB2 class has a prepare function: public function prepare() { if (FALSE === ($this->stmt = db2_prepare($this->conn, $this->sql))) { throw new Exception($this->get_error()); } return $this; } Some mysterious query is causing a warning in the php error log: [26-Jan-2012 11:17:32] PHP Warning: db2_prepare(): Statement Prepare Failed in /<path to file>/Db2.php on line 178 db2_prepare is not returning FALSE. Otherwise, an exception would be thrown, and I would get a backtrace. Am I am not

问题 We were using stringstream to prepare select queries in C++. But we were strongly advised to use QUERY PARAMETERS to submit db2 sql queries to avoid using of stringstream. Can anyone share what exactly meant by query parameter in C++? Also, share some practical sample code snippets. Appreciate the help in advance. Edit: It is stringstream and not strstream. Thanks, Mathew Liju 回答1: I suspect this refers to parameterized queries in general, rather than constructing the query in a string, they

问题 If I have two columns - an ID field and a score field that can take 10 possible values, how can I select 5 random rows per ID? I know I can select 5 random rows from a table by using the following: select *, rand() as idx from mytable order by idx fetch first 5 rows only but how about 5 rows per ID? 回答1: You can do this using row_number() : select t.* from (select t.*, row_number() over (partition by idx order by rand()) as seqnum from mytable t ) t where seqnum <= 5; 来源： https:/

问题 I am having some issues converting a string (yyyymmddhhiiss) to a date using TRANSLATE. If I use a string directly then it works perfectly fine, but when i use a field of exactly same datatype, varchar(14), then it throws the error from the title. Here is a basic example of what i am trying to do: WITH test_table AS ( SELECT '20160101123059' AS d FROM SYSIBM.SYSDUMMY1 ) SELECT d , translate('ABCD-EF-GH IJ:KL:MN', d, 'ABCDEFGHIJKLMN') , translate('ABCD-EF-GH IJ:KL:MN', '20160101123059',

问题 I want to show row number for each of result set row, I have this query in mySQL SELECT @rownum := @rownum + 1 row, e.* FROM Employee e, (SELECT @rownum := 0) r Here @rownum is local variable and would increment its value for each result row. How do i write this query in db2 ( ibm's dashdb ) ? 回答1: If you're just looking to number the output rows, you can use the row_number() function: select row_number() over() as row, e.* from Employee e 回答2: If you are looking to set a variable and set a