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Embedding SQLite in a c programm | ||
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The following program demonstrates how to embed SQLite into a c program.
In order to compile the program, you have to download the SQLite sources (version 3.0.1, the zip file) as well as the
following c program (embed_sqlite.c). I don't know how easy or hard it is to compile it with another compiler
than MinGW.
The program does the following:
The programmembed_sqlite.c
#include <string.h>
#include <stdio.h>
#include "sqlite3.h"
sqlite3* db;
int first_row;
int select_callback(void *p_data, int num_fields, char **p_fields, char **p_col_names) {
int i;
int *p_rn = (int*)p_data;
if (first_row) {
first_row = 0;
for(i=0; i < num_fields; i++) {
printf("%20s", p_col_names[i]);
}
printf("\n");
for(i=0; i< num_fields*20; i++) {
printf("=");
}
printf("\n");
}
(*p_rn)++;
for(i=0; i < num_fields; i++) {
printf("%20s", p_fields[i]);
}
printf("\n");
return 0;
}
void select_stmt(const char* stmt) {
char *errmsg;
int ret;
int nrecs = 0;
first_row = 1;
ret = sqlite3_exec(db, stmt, select_callback, &nrecs, &errmsg);
if(ret!=SQLITE_OK) {
printf("Error in select statement %s [%s].\n", stmt, errmsg);
}
else {
printf("\n %d records returned.\n", nrecs);
}
}
void sql_stmt(const char* stmt) {
char *errmsg;
int ret;
ret = sqlite3_exec(db, stmt, 0, 0, &errmsg);
if(ret != SQLITE_OK) {
printf("Error in statement: %s [%s].\n", stmt, errmsg);
}
}
void insert_countries() {
sql_stmt("begin");
sql_stmt("insert into countries values ('Afghanistan' , 251826, 22664136)");
sql_stmt("insert into countries values ('Albania' , 11100, 3249136)");
sql_stmt("insert into countries values ('Algeria' , 919595, 29183032)");
sql_stmt("insert into countries values ('Andorra' , 175, 67509)");
sql_stmt("insert into countries values ('Angola' , 481354, 10342899)");
sql_stmt("insert into countries values ('Argentina' , 1073400, 34672997)");
sql_stmt("insert into countries values ('Armenia' , 11506, 3463574)");
sql_stmt("insert into countries values ('Australia' , 2966155, 18260863)");
sql_stmt("insert into countries values ('Austria' , 32377, 8013614)");
sql_stmt("insert into countries values ('Azerbaijan' , 33436, 7676953)");
sql_stmt("insert into countries values ('Bahrain' , 267, 590042)");
sql_stmt("insert into countries values ('Bangladesh' , 55598, 123062800)");
sql_stmt("insert into countries values ('Barbados' , 166, 257030)");
sql_stmt("insert into countries values ('Belarus' , 80155, 10415973)");
sql_stmt("insert into countries values ('Belgium' , 11783, 10131863)");
sql_stmt("insert into countries values ('Belize' , 8866, 219296)");
sql_stmt("insert into countries values ('Benin' , 43475, 5709529)");
sql_stmt("insert into countries values ('Bhutan' , 18200, 1822625)");
sql_stmt("insert into countries values ('Bolivia' , 424165, 7165257)");
sql_stmt("insert into countries values ('Bosnia-Herzegovina' , 19741, 2656240)");
sql_stmt("insert into countries values ('Botswana' , 231800, 1477630)");
sql_stmt("insert into countries values ('Brazil' , 3286488, 162661214)");
sql_stmt("insert into countries values ('Brunei' , 2226, 299939)");
sql_stmt("insert into countries values ('Bulgaria' , 42823, 8612757)");
sql_stmt("insert into countries values ('Burkina Faso' , 105869, 10623323)");
sql_stmt("insert into countries values ('Burundi' , 10745, 5943057)");
sql_stmt("insert into countries values ('Cambodia' , 69898, 10600000)");
sql_stmt("insert into countries values ('Cameroon' , 183569, 14261557)");
sql_stmt("insert into countries values ('Canada' , 3849674, 29857369)");
sql_stmt("insert into countries values ('Cape Verde' , 1557, 449066)");
sql_stmt("insert into countries values ('Central African Republic' , 240535, 3274426)");
sql_stmt("insert into countries values ('Chad' , 495755, 6976845)");
sql_stmt("insert into countries values ('Chile' , 292135, 14333258)");
sql_stmt("insert into countries values ('China' , 3689631, 1210004956)");
sql_stmt("insert into countries values ('Colombia' , 440831, 36813161)");
sql_stmt("insert into countries values ('Comoros' , 863, 569237)");
sql_stmt("insert into countries values ('Congo(Zaire)' , 905446, 46498539)");
sql_stmt("insert into countries values ('Congo Republic' , 132047, 2527841)");
sql_stmt("insert into countries values ('Costa Rica' , 19730, 3463083)");
sql_stmt("insert into countries values ('Croatia' , 21829, 5004112)");
sql_stmt("insert into countries values ('Cuba' , 42804, 11007446)");
sql_stmt("insert into countries values ('Cyprus' , 3593, 736636)");
sql_stmt("insert into countries values ('Czech Republic' , 30613, 10321120)");
sql_stmt("insert into countries values ('Denmark' , 16638, 5210833)");
sql_stmt("insert into countries values ('Djibouti' , 8958, 427642)");
sql_stmt("insert into countries values ('Dominica' , 305, 82926)");
sql_stmt("insert into countries values ('Dominican Republic' , 18704, 8088881)");
sql_stmt("insert into countries values ('Ecuador' , 109484, 11466291)");
sql_stmt("insert into countries values ('Egypt' , 386662, 65375107)");
sql_stmt("insert into countries values ('El Salvador' , 8124, 5828987)");
sql_stmt("insert into countries values ('Equatorial Guinea' , 10831, 431282)");
sql_stmt("insert into countries values ('Eritrea' , 45300, 3909628)");
sql_stmt("insert into countries values ('Estonia' , 17413, 1459428)");
sql_stmt("insert into countries values ('Ethiopia' , 483123, 57171682)");
sql_stmt("insert into countries values ('Fiji' , 7078, 782381)");
sql_stmt("insert into countries values ('Finland' , 130559, 5100213)");
sql_stmt("insert into countries values ('France' , 211208, 58317450)");
sql_stmt("insert into countries values ('Gabon' , 103347, 1172798)");
sql_stmt("insert into countries values ('Gambia' , 4127, 1020178)");
sql_stmt("insert into countries values ('Georgia' , 26911, 5219810)");
sql_stmt("insert into countries values ('Germany' , 137882, 83536115)");
sql_stmt("insert into countries values ('Ghana' , 92098, 17698271)");
sql_stmt("insert into countries values ('Greece' , 50962, 10718518)");
sql_stmt("insert into countries values ('Grenada' , 133, 94961)");
sql_stmt("insert into countries values ('Guatemala' , 42042, 11177614)");
sql_stmt("insert into countries values ('Guinea' , 94926, 7411981)");
sql_stmt("insert into countries values ('Guinea-Bissau' , 13948, 1151330)");
sql_stmt("insert into countries values ('Guyana' , 83000, 712091)");
sql_stmt("insert into countries values ('Haiti' , 10714, 6731539)");
sql_stmt("insert into countries values ('Honduras' , 43277, 5605193)");
sql_stmt("insert into countries values ('Hungary' , 35920, 10002541)");
sql_stmt("insert into countries values ('Iceland' , 36769, 268369)");
sql_stmt("insert into countries values ('India' , 1237062, 952107694)");
sql_stmt("insert into countries values ('Indonesia' , 742410, 206611600)");
sql_stmt("insert into countries values ('Iran' , 632457, 66094264)");
sql_stmt("insert into countries values ('Iraq' , 169235, 21422292)");
sql_stmt("insert into countries values ('Ireland' , 27137, 3562902)");
sql_stmt("insert into countries values ('Israel' , 8019, 5215022)");
sql_stmt("insert into countries values ('Italy' , 116234, 57460274)");
sql_stmt("insert into countries values ('Ivory Coast' , 124518, 14762445)");
sql_stmt("insert into countries values ('Jamaica' , 4244, 2593918)");
sql_stmt("insert into countries values ('Japan' , 145870, 125568504)");
sql_stmt("insert into countries values ('Jordan' , 35135, 4212152)");
sql_stmt("insert into countries values ('Kazakhstan' , 1049156, 16916463)");
sql_stmt("insert into countries values ('Kenya' , 224961, 28176686)");
sql_stmt("insert into countries values ('KoreaNorth' , 46540, 23904124)");
sql_stmt("insert into countries values ('KoreaSouth' , 38230, 45482291)");
sql_stmt("insert into countries values ('Kuwait' , 6880, 1950047)");
sql_stmt("insert into countries values ('Kyrgyzstan' , 76641, 4529648)");
sql_stmt("insert into countries values ('Laos' , 91429, 4905772)");
sql_stmt("insert into countries values ('Latvia' , 24595, 2468982)");
sql_stmt("insert into countries values ('Lebanon' , 4015, 3776317)");
sql_stmt("insert into countries values ('Lesotho' , 11720, 1970781)");
sql_stmt("insert into countries values ('Liberia' , 38250, 2109789)");
sql_stmt("insert into countries values ('Libya' , 679362, 5445436)");
sql_stmt("insert into countries values ('Liechtenstein' , 62, 31011)");
sql_stmt("insert into countries values ('Lithuania' , 25174, 3718000)");
sql_stmt("insert into countries values ('Luxembourg' , 998, 406901)");
sql_stmt("insert into countries values ('Macedonia' , 9928, 2104035)");
sql_stmt("insert into countries values ('Madagascar' , 226658, 13670507)");
sql_stmt("insert into countries values ('Malawi' , 45747, 9542844)");
sql_stmt("insert into countries values ('Malaysia' , 129251, 19962893)");
sql_stmt("insert into countries values ('Maldives' , 115, 270758)");
sql_stmt("insert into countries values ('Mali' , 478767, 9653261)");
sql_stmt("insert into countries values ('Malta' , 122, 372314)");
sql_stmt("insert into countries values ('Mauritania' , 395956, 2336048)");
sql_stmt("insert into countries values ('Mauritius' , 788, 1139047)");
sql_stmt("insert into countries values ('Mexico' , 756066, 95772462)");
sql_stmt("insert into countries values ('Micronesia' , 271, 125377)");
sql_stmt("insert into countries values ('Moldova' , 13012, 4463847)");
sql_stmt("insert into countries values ('Mongolia' , 604829, 2496617)");
sql_stmt("insert into countries values ('Morocco' , 275114, 29779156)");
sql_stmt("insert into countries values ('Mozambique' , 308642, 17877927)");
sql_stmt("insert into countries values ('Myanmar (Burma)' , 261228, 49975625)");
sql_stmt("insert into countries values ('Namibia' , 317818, 1677243)");
sql_stmt("insert into countries values ('Nepal' , 56827, 22094033)");
sql_stmt("insert into countries values ('Netherlands' , 16133, 15531940)");
sql_stmt("insert into countries values ('New Zealand' , 103519, 3547983)");
sql_stmt("insert into countries values ('Nicaragua' , 50054, 4272352)");
sql_stmt("insert into countries values ('Niger' , 489191, 9113001)");
sql_stmt("insert into countries values ('Nigeria' , 356669, 103912489)");
sql_stmt("insert into countries values ('Norway' , 125050, 4345941)");
sql_stmt("insert into countries values ('Oman' , 82030, 2186548)");
sql_stmt("insert into countries values ('Pakistan' , 310432, 129275660)");
sql_stmt("insert into countries values ('Panama' , 29157, 2655094)");
sql_stmt("insert into countries values ('Papua New Guinea' , 178704, 4394537)");
sql_stmt("insert into countries values ('Paraguay' , 157048, 5504146)");
sql_stmt("insert into countries values ('Peru' , 496225, 24523408)");
sql_stmt("insert into countries values ('Philippines' , 115831, 74480848)");
sql_stmt("insert into countries values ('Poland' , 120728, 38642565)");
sql_stmt("insert into countries values ('Portugal' , 35516, 9865114)");
sql_stmt("insert into countries values ('Qatar' , 4416, 547761)");
sql_stmt("insert into countries values ('Romania' , 91699, 21657162)");
sql_stmt("insert into countries values ('Russia' , 6592849, 148190419)");
sql_stmt("insert into countries values ('Rwanda' , 10169, 6853359)");
sql_stmt("insert into countries values ('St. Kitts and Nevis' , 104, 41369)");
sql_stmt("insert into countries values ('St. Lucia' , 238, 157862)");
sql_stmt("insert into countries values ('St. Vincent/Grenadines' , 150, 118344)");
sql_stmt("insert into countries values ('São Tomé and Principe' , 372, 144128)");
sql_stmt("insert into countries values ('Saudi Arabia ' , 830000, 19409058)");
sql_stmt("insert into countries values ('Senegal' , 75951, 9092749)");
sql_stmt("insert into countries values ('Seychelles' , 175, 77575)");
sql_stmt("insert into countries values ('Sierra Leone' , 27925, 4793121)");
sql_stmt("insert into countries values ('Singapore' , 246, 3396924)");
sql_stmt("insert into countries values ('Slovakia' , 18933, 5374362)");
sql_stmt("insert into countries values ('Slovenia' , 7819, 1951433)");
sql_stmt("insert into countries values ('Solomon Islands' , 10954, 412902)");
sql_stmt("insert into countries values ('Somalia' , 246201, 9369151)");
sql_stmt("insert into countries values ('South Africa' , 433680, 41743459)");
sql_stmt("insert into countries values ('Spain' , 194885, 38853397)");
sql_stmt("insert into countries values ('Sri Lanka' , 24962, 18553074)");
sql_stmt("insert into countries values ('Sudan' , 967500, 31065229)");
sql_stmt("insert into countries values ('Suriname' , 63251, 436418)");
sql_stmt("insert into countries values ('Swaziland' , 6704, 998730)");
sql_stmt("insert into countries values ('Sweden' , 173732, 8861270)");
sql_stmt("insert into countries values ('Switzerland' , 15943, 7124745)");
sql_stmt("insert into countries values ('Syria' , 71498, 15608648)");
sql_stmt("insert into countries values ('Taiwan' , 13900, 21304000)");
sql_stmt("insert into countries values ('Tajikistan' , 55251, 5916373)");
sql_stmt("insert into countries values ('Tanzania' , 364900, 29058470)");
sql_stmt("insert into countries values ('Thailand' , 198115, 58851357)");
sql_stmt("insert into countries values ('Togo' , 21925, 4570530)");
sql_stmt("insert into countries values ('Trinidad and Tobago' , 1980, 1272385)");
sql_stmt("insert into countries values ('Tunisia' , 63170, 9019687)");
sql_stmt("insert into countries values ('Turkey' , 300948, 62484478)");
sql_stmt("insert into countries values ('Turkmenistan' , 188456, 4149263)");
sql_stmt("insert into countries values ('Uganda' , 93104, 20158176)");
sql_stmt("insert into countries values ('Ukraine' , 233090, 50864009)");
sql_stmt("insert into countries values ('United Arab Emirates' , 32278, 3057337)");
sql_stmt("insert into countries values ('United Kingdom' , 94248, 58489975)");
sql_stmt("insert into countries values ('United States' , 3787425, 265089998)");
sql_stmt("insert into countries values ('Uruguay' , 68500, 3238952)");
sql_stmt("insert into countries values ('Uzbekistan' , 172742, 23418381)");
sql_stmt("insert into countries values ('Venezuela' , 352145, 21983188)");
sql_stmt("insert into countries values ('Vietnam' , 128066, 73976973)");
sql_stmt("insert into countries values ('Yemen' , 205356, 13483178)");
sql_stmt("insert into countries values ('Yugoslavia (Serbia-Montenegro)', 26913, 10611558)");
sql_stmt("insert into countries values ('Zambia' , 290586, 9159072)");
sql_stmt("insert into countries values ('Zimbabwe' , 150873, 11271314)");
sql_stmt("commit");
}
int main() {
sqlite3_open("./countries.db", &db);
if(db == 0) {
printf("Could not open database.");
return 1;
}
sql_stmt("create table countries (country_name, size_sq_miles, population)");
insert_countries();
printf("\nselecting the countries with the largest population\n\n");
select_stmt("select * from countries order by population desc limit 5");
printf("\nselecting the countries with the smallest population\n\n");
select_stmt("select * from countries order by population asc limit 5");
printf("\nselecting the countries with the largest area\n\n");
select_stmt("select * from countries order by size_sq_miles desc limit 5");
printf("\nselecting the countries with the smallest area\n\n");
select_stmt("select * from countries order by size_sq_miles asc limit 5");
sqlite3_close(db);
return 0;
}
The makefile
The makefile is very rudimentary as I expect most .c files (except embed_sqlite.c) to be compiled only once.
makefile
CC_OPTS=-Wall
embed_sqlite.exe : embed_sqlite.o \
attach.o \
auth.o \
build.o \
btree.o \
date.o \
delete.o \
expr.o \
func.o \
hash.o \
insert.o \
legacy.o \
main.o \
opcodes.o \
os_win.o \
pager.o \
parse.o \
pragma.o \
printf.o \
random.o \
select.o \
table.o \
tokenize.o \
trigger.o \
update.o \
util.o \
utf.o \
vacuum.o \
vdbe.o \
vdbeapi.o \
vdbemem.o \
vdbeaux.o \
where.o
gcc embed_sqlite.o \
attach.o \
auth.o \
build.o \
btree.o \
date.o \
delete.o \
expr.o \
func.o \
hash.o \
insert.o \
legacy.o \
main.o \
opcodes.o \
os_win.o \
pager.o \
parse.o \
pragma.o \
printf.o \
random.o \
select.o \
table.o \
tokenize.o \
trigger.o \
update.o \
util.o \
utf.o \
vacuum.o \
vdbe.o \
vdbeapi.o \
vdbemem.o \
vdbeaux.o \
where.o -o $@
embed_sqlite.o : embed_sqlite.c
gcc $(CC_OPTS) -c embed_sqlite.c
legacy.o : legacy.c
gcc $(CC_OPTS) -c legacy.c
main.o : main.c
gcc $(CC_OPTS) -c main.c
attach.o : attach.c
gcc $(CC_OPTS) -c attach.c
auth.o : auth.c
gcc $(CC_OPTS) -c auth.c
btree.o : btree.c btree.h
gcc $(CC_OPTS) -c btree.c
build.o : build.c
gcc $(CC_OPTS) -c build.c
date.o : date.c
gcc $(CC_OPTS) -c date.c
delete.o : delete.c
gcc $(CC_OPTS) -c delete.c
expr.o : expr.c
gcc $(CC_OPTS) -c expr.c
func.o : func.c
gcc $(CC_OPTS) -c func.c
hash.o : hash.c hash.h
gcc $(CC_OPTS) -c hash.c
insert.o : insert.c
gcc $(CC_OPTS) -c insert.c
opcodes.o : opcodes.c opcodes.h
gcc $(CC_OPTS) -c opcodes.c
os_win.o : os_win.c os_win.h
gcc $(CC_OPTS) -c os_win.c
pager.o : pager.c pager.h
gcc $(CC_OPTS) -c pager.c
parse.o : parse.c parse.h
gcc $(CC_OPTS) -c parse.c
pragma.o : pragma.c
gcc $(CC_OPTS) -c pragma.c
printf.o : printf.c
gcc $(CC_OPTS) -c printf.c
random.o : random.c
gcc $(CC_OPTS) -c random.c
select.o : select.c
gcc $(CC_OPTS) -c select.c
#shell.o : shell.c
# gcc $(CC_OPTS) -c shell.c
table.o : table.c
gcc $(CC_OPTS) -c table.c
tokenize.o : tokenize.c
gcc $(CC_OPTS) -c tokenize.c
trigger.o : trigger.c
gcc $(CC_OPTS) -c trigger.c
update.o : update.c
gcc $(CC_OPTS) -c update.c
util.o : util.c
gcc $(CC_OPTS) -c util.c
utf.o : utf.c
gcc $(CC_OPTS) -c utf.c
vacuum.o : vacuum.c
gcc $(CC_OPTS) -c vacuum.c
vdbe.o : vdbe.c vdbe.h
gcc $(CC_OPTS) -c vdbe.c
vdbeapi.o : vdbeapi.c
gcc $(CC_OPTS) -c vdbeapi.c
vdbemem.o : vdbemem.c
gcc $(CC_OPTS) -c vdbemem.c
vdbeaux.o : vdbeaux.c
gcc $(CC_OPTS) -c vdbeaux.c
where.o : where.c
gcc $(CC_OPTS) -c where.c
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