Determining Stack Content Type
Question: Only Objects can be popped from, or push onto, a stack. That means Ihave to wrap a primitive data type, such as int, with something akin toInteger before pushing
Question: Only Objects can be popped from, or push onto, a stack. That means Ihave to wrap a primitive data type, such as int, with something akin toInteger before pushing
Question: How do I determine if a Unix process has stopped writing to a file,so that my Java program can start reading it? Answer: If you are not able to
Question: I’m building an application that has several different frames. Eachhas a button that when pressed should bring up a new frame and closethe calling frame. How can I display
Question: I need to extend class A which resides in a different package, butclass A has only one constructor which is package protected. I get a compile error in class
Question: How do I write a Java program that generates random numbers withinlimits, such as 1 to 100, or 1 to 1000? Answer: The java.util package includes a Random class
Question: I want to connect a Java client program to a C/C++ server applicationusing sockets. What is the easiest way of doing this? Answer: Java provides the ability to write
Question: How do you stop a Thread without using the stop() method? Answer: The recommended method for stopping threads in Java is for each thread topoll a boolean value or
Question: Is there a significant speed advantage to using Hashtables over Vectors? Answer: The answer depends on how you are using those containers classes. Ifyou are only using them for
Question: Is it possible to have a trigger invoke code in a running application (either via a register-notify type of thing or by calling entry points of a DLL or…)?
Question: How do I set a default for a date field having sysdate, current_date or date as the value? Answer: To use the current date as a default value in
When you are inserting data into Oracle tables in SQL*Plus using hard-coded string, some of the character fields may contain the ampersand character (&). The following is an example: insert
Although an index is not mandatory on your foreign keys, if they are not indexed you will cause additional locking when certain Data Manipulation Language statements are executed against the
Many programmers create stored procedures out of large bodies of database trigger codes. This has primarily been because while stored procedures are stored in compiled form, database triggers are compiled
In a PL/SQL block, if you are querying a database table, you need to declare data variables to hold column values returned from the query. The variables can be declared
The DBMS_UTILITY.COMPILE_SCHEMA procedure compiles all procedures, functions and packages in the specified schema. DBAs now don’t have to generate the dynamic scripts to recompile the invalid objects in the schema
PL/SQL supports three parameter-passing modes: IN Related Posts Detach from a Docker Container and Leave it RunningRevolutionary Algorithm Transforms Crop MonitoringPrice of Saving Earth: NY Residents Pay MoreAutoplay an Audio
At some point, you must have encountered a “Snapshot too old” error when running a huge batch transaction. Then you find that you may have to restart the process all
If you are ever trying to write SQL to access SQL server’s system tables, it is often useful to look at SQL Server’s own system stored procedures. You can do
Question: Can you explain the interaction of the RS232 signals (RTS, CTS, DTR, etc.). I need to write a software utility to transmit and receive characters between two computers, but
Question: I need to extract information using WHERE on fields in two different tables: one a text field, the other a numeric field. Both hold only numeric data. How can
Question: I’m writing a select statement to make a table name a variable whose value is set according to a condition: Var tablename;tablename := emp tableselect * from tablename; But
Question: How do I find out if a user has disabled cookies? Answer: To find out if a user has disabled cookies, follow these steps: Set a cookie. Redirect to
Question: Does Informix have a data type similiar to SQL Server’s image or ntext to input paths to link images? Answer: I’d use a CHAR(25) or a VARCHAR field for
Question: Why, after deleting an object I allocated dynamically, is the pointer still there? What exactly have I deleted and what would happen if I assigned a new value to
Question: Does WAP have a concept of IP address? Answer: You can get the gateway IP address and the terminal IP address using HTTP headers. WAP 1.1 currently has no
Question: I have a table in which the key field has a value stored with a percent sign, like ‘1234%’.Using this value, I want to select from another table that
Question: I have installed the version 9.2 of ESQLC, and when I try to run the program in the following manner: esql -e crdb.ec cc -c -I/home/informix/incl/esql crdb.c cc -ocrdb7.exe
Question: How do I concatenate a value in Stored Procedures (e.g., select * from mytable, where mytable.field1 = field that I concatenate)? Answer: If you want to match field1 to
Question: My base class contains this constructor: class Parent { Parent(int a, int b, char* c);}; My derived class contains this constructor: class Child : public Parent { Child(int a);};
Instead of using a META tag to re-direct a URL, simply place this code in place of the old page and a visitor will instantly be taken there. This piece