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DBTask3.c
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DBTask3.c
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#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>
#include <sqlite3.h>
#include <string.h>
#include <stdlib.h>
int autocommitOn = 1;
void showMenu()
{
printf("1 - SELECT query\n");
printf("2 - INSERT query\n");
printf("3 - DELETE query\n");
printf("4 - Output photo\n");
printf (autocommitOn ? "5 - Disable autocommit\n" : "5 - Enable autocommit\n");
printf("0 - Quit\n");}
static int callback(void *data, int argc, char **argv, char **azColName)
{
int i;
for(i = 0; i < argc; i++)
{
printf("%s = %s\n", azColName[i], argv[i]);
}
printf("\n");
return 0;
}
/*int readPhoto (char *filename, FILE *fp)
{
fp = fopen(filename, "rb");
if (fp == NULL)
{
return 0;
}
fseek(fp, 0, SEEK_END);
if (ferror(fp))
{
fclose(fp);
return 0;
}
int flen = ftell(fp);
if (flen == -1)
{
fclose(fp);
return 0;
}
fseek(fp, 0, SEEK_SET);
if (ferror(fp))
{
fclose(fp);
return 0;
}
return flen;
}*/
char *params[] = {"id", "Surname", "BirthCountry"};
int main(int argc, char* argv[])
{
sqlite3 *db;
int rc;
rc = sqlite3_open("Lab4_3.sqlite", &db);
if(rc)
{
fprintf(stderr, "Can't open database: %s\n", sqlite3_errmsg(db));
return(0);
}
else
{
fprintf(stderr, "Opened database successfully\n");
}
for(;;)
{
char *zErrMsg = 0;
char sql[20000];
sqlite3_stmt *res;
int code;
int parameter;
showMenu();
scanf("%d", &code);
switch(code)
{
case 1:
printf("Select next option:\n");
printf("1 - select all\n");
printf("2 - select by id\n");
printf("3 - select by surname\n");
printf("4 - select by country\n");
scanf("%d", ¶meter);
if (parameter == 1)
{
strcpy(sql, "SELECT * from Employees");
rc = sqlite3_exec(db, sql, callback, NULL, &zErrMsg);
if(rc != SQLITE_OK)
{
fprintf(stderr, "SQL error: %s\n", zErrMsg);
sqlite3_free(zErrMsg);
}
}
else if (parameter >= 2 && parameter <= 4)
{
strcpy (sql, "SELECT * from Employees WHERE ");
strcat (sql, params[parameter - 2]);
strcat (sql, " = ?");
rc = sqlite3_prepare_v2(db, sql, -1, &res, 0);
if (rc == SQLITE_OK)
{
printf ("Enter parameter: ");
if (parameter == 2)
{
int id;
scanf("%d", &id);
sqlite3_bind_int(res, 1, id);
}
else
{
char text[256];
scanf("%s", text);
sqlite3_bind_text(res, 1, text, -1, SQLITE_TRANSIENT);
}
} else
{
fprintf(stderr, "Failed to execute statement: %s\n", sqlite3_errmsg(db));
}
//int step;
while (sqlite3_step(res) == SQLITE_ROW)
{
int count = sqlite3_column_count(res);
for (int i = 0; i < count; i++)
printf ("%s = %s\n", sqlite3_column_name(res, i), sqlite3_column_text(res, i));
printf("\n");
}
}
break;
case 2:
{
char cont;
int iter = 0;
int idx;
strcpy(sql, "");
if (!autocommitOn)
strcat (sql, "BEGIN;\n");
//rc = sqlite3_exec(db, "BEGIN;\n", callback, NULL, &zErrMsg);
do
{
char buf[2048];
int id;
// FILE *fp;
int flen;
strcat(sql, "INSERT into Employees (ID, Name, Surname, BirthDate, BirthPlace, BirthCountry, Address, Department, Position, WorksSince) VALUES (");
printf ("Enter ID: ");
scanf ("%d", &id);
sprintf (buf, "%d", id);
strcat(sql, buf);
strcat (sql, ", \'");
printf ("Enter name: ");
scanf ("%s", buf);
strcat(sql, buf);
strcat (sql, "\', \'");
printf ("Enter surname: ");
scanf ("%s", buf);
strcat(sql, buf);
strcat (sql, "\', \'");
printf ("Enter birth date: ");
scanf ("%s", buf);
strcat(sql, buf);
strcat (sql, "\', \'");
printf ("Enter birth place: ");
scanf ("%s", buf);
strcat(sql, buf);
strcat (sql, "\', \'");
printf ("Enter birth country: ");
scanf ("%s", buf);
strcat(sql, buf);
strcat (sql, "\', ");
printf ("Enter address (or \'-\' to set it as NULL): ");
scanf ("%s", buf);
if (strcmp(buf, "-") == 0)
strcat (sql, "NULL, ");
else
{
strcat (sql, "\'");
strcat(sql, buf);
strcat (sql, "\', ");
}
printf ("Enter department (or \'-\' to set it as NULL): ");
scanf ("%s", buf);
if (strcmp(buf, "-") == 0)
strcat (sql, "NULL, ");
else
{
strcat (sql, "\'");
strcat(sql, buf);
strcat (sql, "\', ");
}
printf ("Enter position (or \'-\' to set it as NULL): ");
scanf ("%s", buf);
if (strcmp(buf, "-") == 0)
strcat (sql, "NULL, ");
else
{
strcat (sql, "\'");
strcat(sql, buf);
strcat (sql, "\', ");
}
printf ("Enter date of starting working (or \'-\' to set it as NULL): ");
scanf ("%s", buf);
if (strcmp(buf, "-") == 0)
strcat (sql, "NULL)\n;");
else
{
strcat (sql, "\'");
strcat(sql, buf);
strcat (sql, "\')\n;");
}
/*char buf[2048];
char indexbuf[64];
int id;
// FILE *fp;
int flen;
strcpy(sql, "INSERT into Employees (ID, Name, Surname, BirthDate, BirthPlace, BirthCountry, Address, Department, Position, WorksSince) VALUES (@id, @name, @surname, @birthdate, @birthplace, @birthcountry, @address, @dept, @pos, @workssince);\n");
//sprintf(buf, "@id%d, @name%d, @surname%d, @birthdate%d, @birthplace%d, @birthcountry%d, @address%d, @dept%d, @pos%d, @workssince%d);\n", iter, iter, iter, iter, iter, iter, iter, iter, iter, iter);
// strcat (sql, buf);
rc = sqlite3_prepare_v2(db, sql, -1, &res, 0);
if(rc == SQLITE_OK)
{
printf ("Enter ID: ");
scanf ("%d", &id);
//sprintf(indexbuf, "@id%d", i);
idx = sqlite3_bind_parameter_index(res, "@id");
sqlite3_bind_int(res, idx, id);
printf ("Enter name: ");
scanf ("%s", buf);
//sprintf(indexbuf, "@name%d", i);
idx = sqlite3_bind_parameter_index(res, "@name");
sqlite3_bind_text(res, idx, buf, -1, SQLITE_TRANSIENT);
printf ("Enter surname: ");
scanf ("%s", buf);
//sprintf(indexbuf, "@surname%d", i);
idx = sqlite3_bind_parameter_index(res, "@surname");
sqlite3_bind_text(res, idx, buf, -1, SQLITE_TRANSIENT);
printf ("Enter birth date: ");
scanf ("%s", buf);
//sprintf(indexbuf, "@birthdate%d", i);
idx = sqlite3_bind_parameter_index(res, "@birthdate");
sqlite3_bind_text(res, idx, buf, -1, SQLITE_TRANSIENT);
printf ("Enter birth place: ");
scanf ("%s", buf);
//sprintf(indexbuf, "@birthplace%d", i);
idx = sqlite3_bind_parameter_index(res, "@birthplace");
sqlite3_bind_text(res, idx, buf, -1, SQLITE_TRANSIENT);
printf ("Enter birth country: ");
scanf ("%s", buf);
//sprintf(indexbuf, "@birthcountry%d", i);
idx = sqlite3_bind_parameter_index(res, "@birthcountry");
sqlite3_bind_text(res, idx, buf, -1, SQLITE_TRANSIENT);
printf ("Enter address (or \'-\' to set it as NULL): ");
scanf ("%s", buf);
//sprintf(indexbuf, "@address%d", i);
idx = sqlite3_bind_parameter_index(res, "@address");
if (strcmp(buf, "-") == 0)
sqlite3_bind_null(res, idx);
else
{
sqlite3_bind_text(res, idx, buf, -1, SQLITE_TRANSIENT);
}
printf ("Enter department (or \'-\' to set it as NULL): ");
scanf ("%s", buf);
//sprintf(indexbuf, "@dept%d", i);
idx = sqlite3_bind_parameter_index(res, "@dept");
if (strcmp(buf, "-") == 0)
sqlite3_bind_null(res, idx);
else
{
sqlite3_bind_text(res, idx, buf, -1, SQLITE_TRANSIENT);
}
printf ("Enter position (or \'-\' to set it as NULL): ");
scanf ("%s", buf);
//sprintf(indexbuf, "@pos%d", i);
idx = sqlite3_bind_parameter_index(res, "@pos");
if (strcmp(buf, "-") == 0)
sqlite3_bind_null(res, idx);
else
{
sqlite3_bind_text(res, idx, buf, -1, SQLITE_TRANSIENT);
}
printf ("Enter date of starting working (or \'-\' to set it as NULL): ");
scanf ("%s", buf);
//sprintf(indexbuf, "@workssince%d", i);
idx = sqlite3_bind_parameter_index(res, "@workssince");
if (strcmp(buf, "-") == 0)
sqlite3_bind_null(res, idx);
else
{
sqlite3_bind_text(res, idx, buf, -1, SQLITE_TRANSIENT);
}
sqlite3_step(res)
}*/
/* printf ("Enter the file name of the the photo (or \'-\' if there is no photo): ");
scanf ("%s", buf);
if (strcmp (buf, "-") == 0 || !(flen = readPhoto(buf, fp)))
{
strcat (sql, "NULL);\n");
printf ("Press \'y\' to insert another item or any other key to stop insertions: ");
scanf(" %c", &cont);
getchar();
continue;
}
strcat (sql, "?);\n");
char photo[flen + 1];
int size = fread(photo, 1, flen, fp);
printf("hell");
rc = sqlite3_prepare_v2(db, sql, -1, &pStmt, 0);
if (rc == SQLITE_OK)
{
sqlite3_bind_blob(pStmt, 1, photo, size, SQLITE_STATIC);
rc = sqlite3_step(pStmt);
if (rc != SQLITE_DONE)
{
printf("execution failed: %s", sqlite3_errmsg(db));
}
sqlite3_finalize(pStmt);
}
fclose(fp);*/
//iter++;
printf ("Press \'y\' to insert another item or any other key to stop insertions: ");
scanf(" %c", &cont);
getchar();
} while (cont == 'y');
if (!autocommitOn)
strcat (sql, "COMMIT;\n");
//rc = sqlite3_exec(db, "COMMIT;\n", callback, NULL, &zErrMsg);
rc = sqlite3_exec(db, sql, callback, NULL, &zErrMsg);
if(rc != SQLITE_OK)
{
fprintf(stderr, "SQL error: %s\n", zErrMsg);
sqlite3_free(zErrMsg);
}else
{
fprintf(stdout, "Operation done successfully\n");
}
break;
}
case 3:
printf("Select next option:\n");
printf("1 - delete by id\n");
printf("2 - delete by surname\n");
printf("3 - delete by country\n");
scanf("%d", ¶meter);
if (parameter >= 1 && parameter <= 3)
{
strcpy (sql, "DELETE from Employees WHERE ");
strcat (sql, params[parameter - 1]);
strcat (sql, "= ?");
rc = sqlite3_prepare_v2(db, sql, -1, &res, 0);
if (rc == SQLITE_OK)
{
printf ("Enter parameter: ");
if (parameter == 1)
{
int id;
scanf("%d", &id);
sqlite3_bind_int(res, 1, id);
}
else
{
char text[256];
scanf("%s", text);
sqlite3_bind_text(res, 1, text, -1, SQLITE_TRANSIENT);
}
while (sqlite3_step(res) == SQLITE_ROW);
fprintf(stdout, "Operation done successfully\n");
} else
{
fprintf(stderr, "Failed to execute statement: %s\n", sqlite3_errmsg(db));
}
}
break;
case 4:
{
char filename[256];
FILE *fp;
int id;
void *image;
printf ("Enter blob file name: ");
scanf("%s", filename);
fp = fopen(filename, "wb");
strcpy(sql, "SELECT Id, Photo from Employees WHERE id = ?");
printf("Enter id: ");
scanf ("%d", &id);
rc = sqlite3_prepare_v2(db, sql, -1, &res, 0);
if (rc == SQLITE_OK)
{
sqlite3_bind_int(res, 1, id);
} else
{
fprintf(stderr, "Failed to execute statement: %s\n", sqlite3_errmsg(db));
fclose(fp);
break;
}
int step = sqlite3_step(res);
if (step == SQLITE_ROW)
{
if (sqlite3_column_blob(res, 1) != NULL)
fwrite(sqlite3_column_blob(res, 1), 1, sqlite3_column_bytes(res, 1), fp);
printf("Operation done successfully\n");
}
fclose(fp);
break;
}
case 5:
autocommitOn = (autocommitOn ^ 1) & 1;
break;
case 0:
return 0;
default:
printf("No such option\n");
}
}
sqlite3_close(db);
return 0;
}