C++ with SQLite3: Part 3: Inserting and Selecting Data

C++ with SQLite3

SQLite3 is the most-used SQL implementation in the world. It is a self-contained C library included in everything from portable devices to web browsers.

Note: This tutorial assumes some familiarity with using the command-line to create and compile files. It was written using a MacOS X machine and also assumes easy access to g++. (For Windows systems, consider using MinGW.)


Inserting

In the previous part, the function sqlite3_exec() was used create a new table using the CREATE TABLE keywords in SQL. To add data to the table, sqlite3_exec() can be used again.

To insert more data, multiple SQL statements can be run.

When working with SQL, the sqlite3_exec() will often be used. However, as with using CREATE TABLE, the use of INSERT INTO does not return data to the callback function. For that, a SELECT keyword in SQL would need to be used.

Selecting

The SELECT keyword in SQL can be used to get data from a table. Because it returns data, the callback function used with sqlite3_exec() function.

The callback function takes four parameters:

  • void *NotUsed: Not used. This can be passed from the sqlite3_exec() function directly.
  • int argc: Number of results
  • char **argv: Array of values
  • char **azColName: Array of column names