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spn_sqlite3.c
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spn_sqlite3.c
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/*
* spn_sqlite3.c
* Sparkling bindings for sqlite3
*
* Created by Arpad Goretity
* on 26/04/2014
*
* licensed under the 2-clause BSD License
*/
#include <sqlite3.h>
#include "spn_sqlite3.h"
static int spnlib_sqlite3_open(SpnValue *ret, int argc, SpnValue *argv, void *ctx)
{
SpnString *fname;
sqlite3 *db;
if (argc != 1) {
spn_ctx_runtime_error(ctx, "expecting one argument", NULL);
return -1;
}
if (!spn_isstring(&argv[0])) {
spn_ctx_runtime_error(ctx, "argument must be a file name", NULL);
return -2;
}
fname = spn_stringvalue(&argv[0]);
if (sqlite3_open(fname->cstr, &db) != SQLITE_OK) {
return 0; /* return nil implicitly */
}
/* return database handle as a user info object */
*ret = spn_makeweakuserinfo(db);
return 0;
}
static int spnlib_sqlite3_close(SpnValue *ret, int argc, SpnValue *argv, void *ctx)
{
sqlite3 *db;
if (argc != 1) {
spn_ctx_runtime_error(ctx, "expecting one argument", NULL);
return -1;
}
if (!spn_isweakuserinfo(&argv[0])) {
spn_ctx_runtime_error(ctx, "argument must be an SQLite3 handle", NULL);
return -2;
}
db = spn_ptrvalue(&argv[0]);
sqlite3_close(db);
return 0;
}
static int spnlib_sqlite3_prepare(SpnValue *ret, int argc, SpnValue *argv, void *ctx)
{
sqlite3 *db;
SpnString *query;
sqlite3_stmt *stmt;
if (argc != 2) {
spn_ctx_runtime_error(ctx, "expecting two arguments", NULL);
return -1;
}
if (!spn_isweakuserinfo(&argv[0])) {
spn_ctx_runtime_error(ctx, "first argument must be an SQLite3 handle", NULL);
return -2;
}
if (!spn_isstring(&argv[1])) {
spn_ctx_runtime_error(ctx, "second argument must be a query string", NULL);
return -3;
}
db = spn_ptrvalue(&argv[0]);
query = spn_stringvalue(&argv[1]);
if (sqlite3_prepare_v2(db, query->cstr, query->len, &stmt, NULL) != SQLITE_OK) {
return 0; /* implicitly return nil */
}
/* return prepared statement */
*ret = spn_makeweakuserinfo(stmt);
return 0;
}
static int spnlib_sqlite3_finalize(SpnValue *ret, int argc, SpnValue *argv, void *ctx)
{
sqlite3_stmt *stmt;
if (argc != 1) {
spn_ctx_runtime_error(ctx, "expecting one argument", NULL);
return -1;
}
if (!spn_isweakuserinfo(&argv[0])) {
spn_ctx_runtime_error(ctx, "argument must be a prepared statement", NULL);
return -2;
}
stmt = spn_ptrvalue(&argv[0]);
sqlite3_finalize(stmt);
return 0;
}
static int spnlib_sqlite3_bind(SpnValue *ret, int argc, SpnValue *argv, void *ctx)
{
sqlite3_stmt *stmt;
int parm_idx;
SpnValue *idx_val, *parm_val;
int status;
const void *args[1]; /* for error reporting */
/* typecheck arguments */
if (argc != 3) {
spn_ctx_runtime_error(ctx, "expecting 3 arguments", NULL);
return -1;
}
if (!spn_isweakuserinfo(&argv[0])) {
spn_ctx_runtime_error(ctx, "1st argument must be a statement", NULL);
return -2;
}
stmt = spn_ptrvalue(&argv[0]);
idx_val = &argv[1];
if (spn_isint(idx_val)) {
parm_idx = spn_intvalue(idx_val);
} else if (spn_isstring(idx_val)) {
SpnString *parm_name = spn_stringvalue(idx_val);
parm_idx = sqlite3_bind_parameter_index(stmt, parm_name->cstr);
} else {
spn_ctx_runtime_error(
ctx,
"2nd argument must be a parameter index or name",
NULL
);
return -4;
}
/* actually perform the binding */
parm_val = &argv[2];
switch (spn_valtype(parm_val)) {
case SPN_TTAG_NIL: {
status = sqlite3_bind_null(stmt, parm_idx);
break;
}
case SPN_TTAG_BOOL: {
status = sqlite3_bind_int(stmt, parm_idx, spn_boolvalue(parm_val));
break;
}
case SPN_TTAG_NUMBER: {
if (spn_isint(parm_val)) {
long n = spn_intvalue(parm_val);
status = sqlite3_bind_int64(stmt, parm_idx, n);
} else {
double x = spn_floatvalue(parm_val);
status = sqlite3_bind_double(stmt, parm_idx, x);
}
break;
}
case SPN_TTAG_STRING: {
SpnString *str = spn_stringvalue(parm_val);
status = sqlite3_bind_text(stmt, parm_idx, str->cstr, str->len, SQLITE_TRANSIENT);
break;
}
case SPN_TTAG_ARRAY: /* fallthru */
case SPN_TTAG_USERINFO: /* fallthru */
default:
args[0] = spn_type_name(parm_val->type);
spn_ctx_runtime_error(ctx, "cannot bind value of type %s", args);
return -5;
break;
}
*ret = spn_makebool(status == SQLITE_OK);
return 0;
}
static int spnlib_sqlite3_row(SpnValue *ret, int argc, SpnValue *argv, void *ctx)
{
sqlite3_stmt *stmt;
int isassoc;
int status;
if (argc != 2) {
spn_ctx_runtime_error(ctx, "expecting two arguments", NULL);
return -1;
}
if (!spn_isweakuserinfo(&argv[0])) {
spn_ctx_runtime_error(ctx, "1st argument must be a prepared statement", NULL);
return -2;
}
if (!spn_isbool(&argv[1])) {
spn_ctx_runtime_error(ctx, "2nd argument must be a boolean", NULL);
return -3;
}
stmt = spn_ptrvalue(&argv[0]);
isassoc = spn_boolvalue(&argv[1]);
status = sqlite3_step(stmt);
/* if there is data available, return it */
if (status == SQLITE_ROW) {
int n_cols = sqlite3_column_count(stmt);
SpnArray *column = spn_array_new();
int i;
for (i = 0; i < n_cols; i++) {
const char *col_name = sqlite3_column_name(stmt, i);
int col_type = sqlite3_column_type(stmt, i);
SpnValue col_value;
switch (col_type) {
case SQLITE_NULL: {
col_value = spn_makenil();
break;
}
case SQLITE_INTEGER: {
sqlite3_int64 n = sqlite3_column_int64(stmt, i);
col_value = spn_makeint(n);
break;
}
case SQLITE_FLOAT: {
double x = sqlite3_column_double(stmt, i);
col_value = spn_makefloat(x);
break;
}
case SQLITE_TEXT: {
/* however hard I tried, casts were ugly */
const unsigned char *utext = sqlite3_column_text(stmt, i);
const void *p = utext;
const char *cstr = p;
int len = sqlite3_column_bytes(stmt, i);
col_value.type = SPN_TYPE_STRING;
col_value.v.o = spn_string_new_len(cstr, len);
break;
}
case SQLITE_BLOB: {
const void *blob = sqlite3_column_blob(stmt, i);
int len = sqlite3_column_bytes(stmt, i);
col_value.type = SPN_TYPE_STRING;
col_value.v.o = spn_string_new_len(blob, len);
break;
}
default: break; /* unreachable */
}
if (isassoc) {
spn_array_set_strkey(column, col_name, &col_value);
} else {
spn_array_set_intkey(column, i, &col_value);
}
spn_value_release(&col_value);
}
ret->type = SPN_TYPE_ARRAY;
ret->v.o = column;
}
/* else implicitly return nil */
return 0;
}
static int spnlib_sqlite3_reset(SpnValue *ret, int argc, SpnValue *argv, void *ctx)
{
sqlite3_stmt *stmt;
if (argc != 1) {
spn_ctx_runtime_error(ctx, "expecting one argument", NULL);
return -1;
}
if (!spn_isweakuserinfo(&argv[0])) {
spn_ctx_runtime_error(ctx, "argument must be a prepared statement", NULL);
return -2;
}
stmt = spn_ptrvalue(&argv[0]);
sqlite3_reset(stmt);
return 0;
}
static int spnlib_sqlite3_errcode(SpnValue *ret, int argc, SpnValue *argv, void *ctx)
{
sqlite3 *db;
int errcode;
if (argc != 1) {
spn_ctx_runtime_error(ctx, "expecting one argument", NULL);
return -1;
}
if (!spn_isweakuserinfo(&argv[0])) {
spn_ctx_runtime_error(ctx, "argument must be an SQLite3 handle", NULL);
return -2;
}
db = spn_ptrvalue(&argv[0]);
errcode = sqlite3_errcode(db);
*ret = spn_makeint(errcode);
return 0;
}
static int spnlib_sqlite3_errmsg(SpnValue *ret, int argc, SpnValue *argv, void *ctx)
{
sqlite3 *db;
const char *errmsg;
if (argc != 1) {
spn_ctx_runtime_error(ctx, "expecting one argument", NULL);
return -1;
}
if (!spn_isweakuserinfo(&argv[0])) {
spn_ctx_runtime_error(ctx, "argument must be an SQLite3 handle", NULL);
return -2;
}
db = spn_ptrvalue(&argv[0]);
errmsg = sqlite3_errmsg(db);
*ret = spn_makestring(errmsg);
return 0;
}
const SpnExtFunc spnlib_sqlite3[SPN_LIBSIZE_SQLITE3] = {
{ "open", spnlib_sqlite3_open },
{ "close", spnlib_sqlite3_close },
{ "prepare", spnlib_sqlite3_prepare },
{ "finalize", spnlib_sqlite3_finalize },
{ "bind", spnlib_sqlite3_bind },
{ "row", spnlib_sqlite3_row },
{ "reset", spnlib_sqlite3_reset },
{ "errcode", spnlib_sqlite3_errcode },
{ "errmsg", spnlib_sqlite3_errmsg }
};
void spnlib_load_sqlite3(SpnContext *ctx)
{
spn_ctx_addlib_cfuncs(ctx, "sqlite3", spnlib_sqlite3, SPN_LIBSIZE_SQLITE3);
}