How To Create A Table In Dev C++
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I wanted to create a simple table by printing lines in between my values with a header at the top and my numbers left justified. However, when I get to a ten digit number or larger, my code seems to break and my count variable goes to zero as far as I can tell, causing a bunch of space to be printed where it doesn't need to be. I was wondering what I'm doing wrong. Thank you for any help you can offer!
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How To Make Table In Dev C++
You want to print a table with the powers of 2 and you want your integers to be signed and unsigned. You're making it to complicated I think, use t to separate your output. Or use something like printf(' %d %u ',x,y);
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This tutorial is going to use libpqxx library, which is the official C++ client API for PostgreSQL. The source code for libpqxx is available under the BSD license, so you are free to download it, pass it on to others, change it, sell it, include it in your own code, and share your changes with anyone you choose.
Installation
The the latest version of libpqxx is available to be downloaded from the link Download Libpqxx. So download the latest version and follow the following steps −
Before you start using C/C++ PostgreSQL interface, find the pg_hba.conf file in your PostgreSQL installation directory and add the following line −
You can start/restart postgres server in case it is not running using the following command −
C/C++ Interface APIs
The following are important interface routines which can sufice your requirement to work with PostgreSQL database from your C/C++ program. If you are looking for a more sophisticated application then you can look into the libpqxx official documentation, or you can use commercially available APIs.
| S. No. | API & Description |
|---|---|
| 1 | pqxx::connection C( const std::string & dbstring ) This is a typedef which will be used to connect to the database. Here, dbstring provides required parameters to connect to the datbase, for example dbname = testdb user = postgres password=pass123 hostaddr=127.0.0.1 port=5432. If connection is setup successfully then it creates C with connection object which provides various useful function public function. |
| 2 | C.is_open() The method is_open() is a public method of connection object and returns boolean value. If connection is active, then this method returns true otherwise it returns false. |
| 3 | C.disconnect() This method is used to disconnect an opened database connection. |
| 4 | pqxx::work W( C ) This is a typedef which will be used to create a transactional object using connection C, which ultimately will be used to execute SQL statements in transactional mode. If transaction object gets created successfully, then it is assigned to variable W which will be used to access public methods related to transactional object. |
| 5 | W.exec(const std::string & sql) This public method from transactional object will be used to execute SQL statement. |
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| 7 | W.abort() This public method from transactional object will be used to rollback the transaction. |
| 8 | pqxx::nontransaction N( C ) This is a typedef which will be used to create a non-transactional object using connection C, which ultimately will be used to execute SQL statements in non-transactional mode. If transaction object gets created successfully, then it is assigned to variable N which will be used to access public methods related to non-transactional object. |
| 9 | N.exec(const std::string & sql) This public method from non-transactional object will be used to execute SQL statement and returns a result object which is actually an interator holding all the returned records. |
Connecting To Database
The following C code segment shows how to connect to an existing database running on local machine at port 5432. Here, I used backslash for line continuation.
Now, let us compile and run the above program to connect to our database testdb, which is already available in your schema and can be accessed using user postgres and password pass123.
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You can use the user ID and password based on your database setting. Remember to keep the -lpqxx and -lpq in the given order! Otherwise, the linker will complain bitterly about the missing functions with names starting with 'PQ.'
Create a Table
The following C code segment will be used to create a table in previously created database −
When the above given program is compiled and executed, it will create COMPANY table in your testdb database and will display the following statements −
INSERT Operation
The following C code segment shows how we can create records in our COMPANY table created in above example −
When the above given program is compiled and executed, it will create given records in COMPANY table and will display the following two lines −
SELECT Operation
The following C code segment shows how we can fetch and display records from our COMPANY table created in above example −
When the above given program is compiled and executed, it will produce the following result −
UPDATE Operation
How To Create A Table In Dev C Online
The following C code segment shows how we can use the UPDATE statement to update any record and then fetch and display updated records from our COMPANY table −
When the above given program is compiled and executed, it will produce the following result −
How To Create A Table In Dev C Download
DELETE Operation
The following C code segment shows how we can use the DELETE statement to delete any record and then fetch and display remaining records from our COMPANY table −
When the above given program is compiled and executed, it will produce the following result −