SQLite C/C ++ tutorial

1 Installation 2 C/C ++ Interface APIs 3. Connect to the database 4. Create a table 5 insert operations 6. Update operations 7. Delete

 

 

 

S. N	API
1	Sqlite3_open (const char * filename, sqlite3 ** ppDb)
2	Sqlite3_exec (sqlite3 *, const char * SQL, sqlite_callback, void * data, char ** errmsg)
3	Sqlite3_close (sqlite3 *)

 

The following code requires a prompt:

The databases created in each example are created based on the previous database. Otherwise, the following code cannot be run !!

# Include <stdio. h> # Include <stdlib. h> # Include <sqlite3.h>   Int main (int argc, char * argv []) { Sqlite3 * db; Char * zErrMsg = 0; Int rc;   Rc = sqlite3_open ("test. db", & db );   If (rc ){ Fprintf (stderr, "Can't open database: % s \ n", sqlite3_errmsg (db )); Exit (0 ); } Else { Fprintf (stderr, "Opened database successfully \ n "); } Sqlite3_close (db ); }

-rwxr-xr-x. 1 root root 7383 May 8 02:06 a.out -rw-r--r--. 1 root root 323 May 8 02:05 test.c -rw-r--r--. 1 root root 0 May 8 02:06 test.db

 

 

 

 

# Include <stdio. h> # Include <stdlib. h> # Include <sqlite3.h>   Static int callback (void * NotUsed, int argc, char ** argv, char ** azColName ){ Int I; For (I = 0; I <argc; I ++ ){ Printf ("% s = % s \ n", azColName [I], argv [I]? Argv [I]: "NULL "); } Printf ("\ n "); Return 0; }   Int main (int argc, char * argv []) { Sqlite3 * db; Char * zErrMsg = 0; Int rc; Char * SQL;   /* Open database */ Rc = sqlite3_open ("test. db", & db ); If (rc ){ Fprintf (stderr, "Can't open database: % s \ n", sqlite3_errmsg (db )); Exit (0 ); } Else { Fprintf (stdout, "Opened database successfully \ n "); }   /*** Generate an SQL statement ***/ SQL = "CREATE TABLE COMPANY ("\ "Id int primary key not null ,"\ "Name text not null ,"\ "Age int not null ,"\ "Address char (50 ),"\ "Salary real );";   /*** Execute the SQLite statement ***/ Rc = sqlite3_exec (db, SQL, callback, 0, & zErrMsg ); If (rc! = SQLITE_ OK ){ Fprintf (stderr, "SQL error: % s \ n", zErrMsg ); Sqlite3_free (zErrMsg ); } Else { Fprintf (stdout, "Table created successfully \ n "); } Sqlite3_close (db ); Return 0; }

-rwxr-xr-x. 1 root root 9567 May 8 02:31 a.out -rw-r--r--. 1 root root 1207 May 8 02:31 test.c -rw-r--r--. 1 root root 3072 May 8 02:31 test.db

 

 

# Include <stdio. h> # Include <stdlib. h> # Include <sqlite3.h>   Static int callback (void * NotUsed, int argc, char ** argv, char ** azColName ){ Int I; For (I = 0; I <argc; I ++ ){ Printf ("% s = % s \ n", azColName [I], argv [I]? Argv [I]: "NULL "); } Printf ("\ n "); Return 0; }   Int main (int argc, char * argv []) { Sqlite3 * db; Char * zErrMsg = 0; Int rc; Char * SQL;   /* Open database */ Rc = sqlite3_open ("test. db", & db ); If (rc ){ Fprintf (stderr, "Can't open database: % s \ n", sqlite3_errmsg (db )); Exit (0 ); } Else { Fprintf (stderr, "Opened database successfully \ n "); }   /* Create SQL statement */ SQL = "INSERT INTO COMPANY (ID, NAME, AGE, ADDRESS, SALARY )"\ "VALUES (1, 'paol', 32, 'california, 20000.00 );"\ "Insert into company (ID, NAME, AGE, ADDRESS, SALARY )"\ "VALUES (2, 'allen ', 25, 'texas, 15000.00 );"\ "Insert into company (ID, NAME, AGE, ADDRESS, SALARY )"\ "VALUES (3, 'Teddy ', 23, 'norve', 20000.00 );"\ "Insert into company (ID, NAME, AGE, ADDRESS, SALARY )"\ "VALUES (4, 'mark', 25, 'Rich-Mond, 65000.00 );";   /* Execute SQL statement */ Rc = sqlite3_exec (db, SQL, callback, 0, & zErrMsg ); If (rc! = SQLITE_ OK ){ Fprintf (stderr, "SQL error: % s \ n", zErrMsg ); Sqlite3_free (zErrMsg ); } Else { Fprintf (stdout, "Records created successfully \ n "); } Sqlite3_close (db ); Return 0; }

Opened database successfully Records created successfully

 

 

 

 

 

# Include <stdio. h> # Include <stdlib. h> # Include <sqlite3.h> Static int callback (void * data, int argc, char ** argv, char ** azColName ){ Int I; Fprintf (stderr, "% s:", (const char *) data ); For (I = 0; I <argc; I ++ ){ Printf ("% s = % s \ n", azColName [I], argv [I]? Argv [I]: "NULL "); } Printf ("\ n "); Return 0; } Int main (int argc, char * argv []) { Sqlite3 * db; Char * zErrMsg = 0; Int rc; Char * SQL; Const char * data = "Callback function called ";   /* Open database */ Rc = sqlite3_open ("test. db", & db ); If (rc ){ Fprintf (stderr, "Can't open database: % s \ n", sqlite3_errmsg (db )); Exit (0 ); } Else { Fprintf (stderr, "Opened database successfully \ n "); }   /* Create merged SQL statement */ SQL = "UPDATE COMPANY set SALARY = 25000.00 where ID = 1 ;"\ "SELECT * from COMPANY ";   /* Execute SQL statement */ Rc = sqlite3_exec (db, SQL, callback, (void *) data, & zErrMsg ); If (rc! = SQLITE_ OK ){ Fprintf (stderr, "SQL error: % s \ n", zErrMsg ); Sqlite3_free (zErrMsg ); } Else { Fprintf (stdout, "Operation done successfully \ n "); } Sqlite3_close (db ); Return 0; }

 

# Include <stdio. h> # Include <stdlib. h> # Include <sqlite3.h>   Static int callback (void * data, int argc, char ** argv, char ** azColName ){ Int I; Fprintf (stderr, "% s:", (const char *) data ); For (I = 0; I <argc; I ++ ){ Printf ("% s = % s \ n", azColName [I], argv [I]? Argv [I]: "NULL "); } Printf ("\ n "); Return 0; }   Int main (int argc, char * argv []) { Sqlite3 * db; Char * zErrMsg = 0; Int rc; Char * SQL; Const char * data = "Callback function called ";   /* Open database */ Rc = sqlite3_open ("test. db", & db ); If (rc ){ Fprintf (stderr, "Can't open database: % s \ n", sqlite3_errmsg (db )); Exit (0 ); } Else { Fprintf (stderr, "Opened database successfully \ n "); }   /* Create merged SQL statement */ SQL = "DELETE from COMPANY where ID = 2 ;"\ "SELECT * from COMPANY ";   /* Execute SQL statement */ Rc = sqlite3_exec (db, SQL, callback, (void *) data, & zErrMsg ); If (rc! = SQLITE_ OK ){ Fprintf (stderr, "SQL error: % s \ n", zErrMsg ); Sqlite3_free (zErrMsg ); } Else { Fprintf (stdout, "Operation done successfully \ n "); } Sqlite3_close (db ); Return 0; }