C Postgre. SQL Example. In this article, Ill show you an example on how to integrate the Postgre. SQL C library into your C project solution. The Postgre. SQL version that i am using for this example is Postgre. SQL for Windows version 8. In case you dont have Postgre. SQL installed on your machine, you can download it at postgresql 8. Postgresql Insert Update' title='Postgresql Insert Update' />You may need to provide some details first before start to download. Make sure that you have installed Postgre. This tutorial shows how to Design your first Azure Database for PostgreSQL using Azure CLI. PostgreSQL UPDATE Query Learn PostgreSQL in simple and easy steps starting from basic to advanced concepts with examples including database programming, Overview. SQL successfully and please REMEMBER your password to login to Postgre. SQL through its command console windows in later. Lets start to create a database for this example now. Run the psql in the command windows and create a new database named testdb as the following screen shot. Once the database has been created, we are now ready for the coding part. Lets create a Win. I am using visual studio 2. The first task we need to do right now is to include the Postgre. SQL C interface header file and lib to our project. You can do that by right click your project solution and click properties. Note 1 You might need to change the following file path accordingly. Product_01_PostgreSQL_Mac_08_CodeSnippet.png' alt='Postgresql Insert Update' title='Postgresql Insert Update' />CC General Additional Include Directories. C Program FilesPostgre. SQL8. 4include. Linker General Additional Library Directories. C Program FilesPostgre. SQL8. 4lib. Linker Input Additional Dependencies. Note 2 At the end of this example, you will need to copy your project output EXE to. Postgre. SQL8. 4bin. Alternately, you can copy all DLLs located at. Postgre. SQL8. 4bin to you project output folder. We will start the coding part in our cpp file now. Make sure that you include the following header accordingly. This Oracle tutorial explains how to use the Oracle UPDATE statement with syntax, examples, and practice exercises. The Oracle UPDATE statement is used to update. Im not sure if its standard SQL INSERT INTO tblA SELECT id, time FROM tblB WHERE time 1000 What Im looking for is what if tblA and tblB are. Column order does matter so if and only if the column orders match you can for example insert into itemsver select from items where itemid2. New in PostgreSQL 10. Ensure that INSERT. ON CONFLICT DO UPDATE checks table permissions and RLS policies in all cases Dean Rasheed The update path of. Now we start our very first functon named Close. Conn. This function will make sure that we close the database connection accordingly. Close connection to database void Close. ConnPGconn onnPQfinishconn getchar exit1. Next, we create a function named Connect. DB. This function will establish a connection to Postgre. SQL server. Please be sure that you provide the correct parameters in Postgre. A relational database management system uses SQL MERGE also called upsert statements to INSERT new records or UPDATE existing records depending on whether condition. SQL. Prior to this example, i have setup a database called testdb with user password of test. You might need to modify it accordingly in order to make sure the compilation success. ETU-SQL-for-PostgreSQL_2.png' alt='Postgresql Insert Update' title='Postgresql Insert Update' />Establish connection to database. PGconn onnect. DB. PGconn onn NULL  Make a connection to the databaseconn PQconnectdbuserpostgres passwordtest. Check to see that the backend connection was successfully made ifPQstatusconn CONNECTIONOKprintfConnection to database failed Close. Connconn   printfConnection to database OKn  return conn. Next, we create a function named Create. Employee. Table. This function will create an employee table in our testdb database. Create employee table void Create. Employee. TablePGconn onn Execute with sql statement. PGresult es PQexecconn, CREATE TABLE employee Fname char3. Lname char3. 0 ifPQresult. Statusres PGRESCOMMANDOKprintfCreate employee table failed. PQclearres. Close. Connconn   printfCreate employee table OKn  Clear result. PQclearres. Next, we create a function named Insert. Employee. Rec. This function will take 2 parameters, fname and lname in char pointer type, to form a SQL statement. It then will be executed in order to store the record into the employee table. Append SQL statement and insert record into employee table void Insert. Employee. RecPGconn onn, charfname, charlname Append the SQL statment. SQL. s. SQL. appendINSERT INTO employee VALUES. Patch For Fifa 2005 Pc. SQL. appendfname. SQL. append,. SQL. SQL. append Execute with sql statement. PGresult es PQexecconn, s. SQL. cstr    ifPQresult. Statusres PGRESCOMMANDOKprintfInsert employee record failed PQclearres Close. Connconn   printfInsert employee record OKn  Clear result. PQclearres. Next, we create a function named Fetch. Employee. Rec. This function will fetch all the record in employee table and display it on the console windows. Fetch employee record and display it on screen void Fetch. Employee. RecPGconn onn Will hold the number of field in employee tableint n. Fields  Start a transaction block. PGresult es   PQexecconn, BEGIN    ifPQresult. Statusres PGRESCOMMANDOKprintfBEGIN command failed PQclearres Close. Connconn     Clear result. PQclearres    Fetch rows from employee tableres PQexecconn, DECLARE emprec CURSOR FOR select from employee ifPQresult. Statusres PGRESCOMMANDOKprintfDECLARE CURSOR failed PQclearres Close. Connconn   Clear result. PQclearres    res PQexecconn, FETCH ALL in emprec    ifPQresult. Statusres PGRESTUPLESOKprintfFETCH ALL failed PQclearres Close. Connconn     Get the field namen. Fields PQnfieldsres  Prepare the header with employee table field nameprintfn. Fetch employee record printfnn forint i 0 i lt n. Fields iprintf 3. PQfnameres, i printfnn    Next, print out the employee record for each rowforint i 0 i lt PQntuplesres iforint j 0 j lt n. Fields jprintf 3. PQgetvalueres, i, j printfn PQclearres    Close the emprecres PQexecconn, CLOSE emprec PQclearres    End the transactionres PQexecconn, END  Clear result. PQclearres. Next, we create a function named Remove. All. Employee. Rec. This function will remove all record in employee table. Erase all record in employee table void Remove. All. Employee. RecPGconn onn Execute with sql statement. PGresult es PQexecconn, DELETE FROM employee    ifPQresult. Statusres PGRESCOMMANDOKprintfDelete employees record failed. PQclearres Close. Connconn   printfn. Delete employees record OKn  Clear result. PQclearres. Next, we create a function named Drop. Employee. Table. This function will drop or remove the employee from the testdb database. Drop employee table from the databasevoid Drop. Employee. TablePGconn onn Execute with sql statement. PGresult es PQexecconn, DROP TABLE employee    ifPQresult. Statusres PGRESCOMMANDOKprintfDrop employee table failed. PQclearres Close. Connconn   printfDrop employee table OKn  Clear result. PQclearres. Finally, we update the main entry point function so that it call all the functions that we have created to demonstrate what we intend to show in this example. TCHARargv. PGconn     onn NULL  conn Connect. DB Create. Employee. Tableconn Insert. Employee. Recconn, Mario, Hewardt Insert. Employee. Recconn, Daniel, Pravat Fetch. Employee. Recconn  printfn. Press ENTER to remove all records table. Remove. All. Employee. Recconn Drop. Employee. Tableconn  Close. Connconn  return. Try to compile and run the application now. You should see the following screen shot. At this point, if you are running the SELECT statment from the Postgre. SQL command console, you will see the same data being display on your C win.