Libsqlite3

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Overview

Sqlite3 프로그래밍.

Connecting to database

데이터 베이스 생성 후 접속하기.

  • Code

<source lang=c>

  1. include <stdio.h>
  2. 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);

}

</source>

  • compile

<source lang=bash> $ gcc test.c -l sqlite3 $ ./a.out Opened database successfully </source>

Create a table

데이터 베이스 생성 후, 테이블 생성하기.

  • Code

<source lang=c>

  1. include <stdio.h>
  2. include <stdlib.h>
  3. 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[1] ? 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");
   }
   
   /* Create 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 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, "Table created successfully\n");
   }
   sqlite3_close(db);
   return 0;

} </source>

Insert operation

  • Code

<source lang=c>

  1. include <stdio.h>
  2. include <stdlib.h>
  3. 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, 'Paul', 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, 'Norway', 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;

} </source>

  • Result

<source lang=bash> $ ./main Opened database successfully Records created successfully </source>

Select operation

  • Callback prototype

<source lang=c> typedef int (*sqlite3_callback)( 

   void*,    /* Data provided in the 4th argument of sqlite3_exec() */
   int,      /* The number of columns in row */
   char**,   /* An array of strings representing fields in the row */
   char**    /* An array of strings representing column names */

); </source>

  • code

<source lang=c>

  1. include <stdio.h>
  2. include <stdlib.h>
  3. 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 SQL statement */
   sql = "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;

} </source>

  • Result
Opened database successfully
Callback function called: ID = 1
NAME = Paul
AGE = 32
ADDRESS = California
SALARY = 20000.0

Callback function called: ID = 2
NAME = Allen
AGE = 25
ADDRESS = Texas
SALARY = 15000.0

Callback function called: ID = 3
NAME = Teddy
AGE = 23
ADDRESS = Norway
SALARY = 20000.0

Callback function called: ID = 4
NAME = Mark
AGE = 25
ADDRESS = Rich-Mond
SALARY = 65000.0

Operation done successfully

Update operation

  • Code

<source lang=c>

  1. include <stdio.h>
  2. include <stdlib.h>
  3. 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;

} </source>

  • Result

<source lang=bash> Opened database successfully Callback function called: ID = 1 NAME = Paul AGE = 32 ADDRESS = California SALARY = 25000.0

Callback function called: ID = 2 NAME = Allen AGE = 25 ADDRESS = Texas SALARY = 15000.0

Callback function called: ID = 3 NAME = Teddy AGE = 23 ADDRESS = Norway SALARY = 20000.0

Callback function called: ID = 4 NAME = Mark AGE = 25 ADDRESS = Rich-Mond SALARY = 65000.0

Operation done successfully </source>

Delete operation

  • Code

<source lang=c>

  1. include <stdio.h>
  2. include <stdlib.h>
  3. 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;

} </source>

  • Result

<source lang=bash> Opened database successfully Callback function called: ID = 1 NAME = Paul AGE = 32 ADDRESS = California SALARY = 25000.0

Callback function called: ID = 3 NAME = Teddy AGE = 23 ADDRESS = Norway SALARY = 20000.0

Callback function called: ID = 4 NAME = Mark AGE = 25 ADDRESS = Rich-Mond SALARY = 65000.0

Operation done successfully </source>

External links

  • http://www.tutorialspoint.com/sqlite/sqlite_c_cpp.htm
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