JDBC programming, often through the ResultSet RS to obtain the result set, to determine whether the result set is empty often can not directly determine rs = null, so a frequently used method is as follows
try{
conn = Db.getconn ();
String sql =
Several ways in which a function/procedure in Oracle Returns a result set:
In the case of function return, the stored procedure can only be changed to out parameters and passed in the Oracle 10g test.
(1) Return cursor:
The return type is:
Today, a friend of mine to see if a phenomenon is not a bug, if the direct query error, if nested one layer plus rownum will not be an error, if removed rownum will lead to false recurrence, regardless of the rownum specified query how many lines,
Q: There is a problem,I called another stored procedure b in a stored procedure a "NOTE: This stored procedure cannot be changed."A #tmp data is displayed in BHow do I use #tmp data in a
A: Using temporary tables
--Create a stored procedureCREATE
Cause of Error:As described in the APIApi:A table of data representing a database result set, which is usually generated by executing a statement that queries the D Atabase. A ResultSet object maintains a cursor pointing to it current row of data.
scenario : Traverse and process all the data in a large table, the data in this table may be thousands or hundreds of billions of dollars, many people may say with paging limit ... However, the requirement itself is more convenient for one-time
Result set of the first querySelect* from(SelectC.msname,a.msid,c.msprice, C.msprice*count (A.MSID) asTotalmoney,sum (A.msamount) asTotalCount fromBillconsume a RIGHT join (SelectTop1Mstime asStarttime,getdate () asEndTime
Common-dbutils.jar is an open Source Tool class library provided by the Apache Organization for simple JDBC encapsulation, which simplifies the development of JDBC applications without compromising program performance.1, Queryrunner class①update
ObjectiveFor a long time did not touch the database, the weekend at home to write a report of the stored procedures, a time to use the stored procedures to achieve paging and calculate the total number of records do not know how better to achieve.
Haven't come up for a long time, do not have a little idle work today, studied the Oracle stored procedure returns the result set.With Oracle staging tables, the use of stored procedures to return data read from a result set can solve the problem of
When using connector/c++ to query Mysql, an error occurred, prompting the following:Can't fetch because not on result set,There are reasons to see here: http://stackoverflow.com/questions/17294611/sqlinvalidargumentexception-mysql-cIt means that you
A query in the form of a select * from table cannot appear in MySQL's Trigger and function because it returns a result set, which is unacceptable in MySQL's trigger and function, but can be used in stored procedures. In Trigger and function you can
I wrote a method to query the results, but I found that the result set contains data during the debug process. How can I get the data through the variable? The Code is as follows: I wrote a method to query the results, however, how can I obtain the
Oracle result set cache: oracle adjusts the result set cache with only three parameters. RESULT_CACHE_MAX_SIZE = 500 M/* Megabytes RESULT_CACHE_MAX_RESULT = 20/* Percentage limit = 3600/* Minutes, but all queries are saved only when
Stored Procedure:
Use base_passport
Go
Create proc yhj_test
@ Input_a int,
@ Input_ B int,
@ Output_c int out
As
Begin
Select * from config. city;
Set @ output_c = @ input_a * @ input_ B;
Return @ input_a + @ input_ B;
End
Mybats Configuration:
MySql randomly retrieves a data entry from the table result set.
[SQL] Select * from (Select (@ rowNo: = @ rowNo + 1) AS rowno, pwd from pur_admininfo, (Select @ rowNo: = 0) B) tmp where rowno = (Select Round (Rand () * 10000000% (Select Count (*)
Thinkphp has one day of data in the obtained result set. how can I extract the data and convert it to an array? Thinkphpphp
Thinkphp has one day of data in the obtained result set. how can I extract the data and convert it to an array?
Performforeach ( $results as $result ){ // code goes here ..}....foreach ( $results as $result ){ // code goes here ..}This result will be indicated as a forward only result set, calling Rewind () after moving forward are not
Php calls the stored procedure to return the result set, solving can "> I need php to call the stored procedure and return a result set. I found it very difficult. after searching for a long time, I finally found a solution on a foreign forum. here
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