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sqlite3_drv.c
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sqlite3_drv.c
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#include "sqlite3_drv.h"
#include <stdarg.h>
#include <limits.h>
// MSVC needs "__inline" instead of "inline" in C-source files.
#if defined(_MSC_VER)
#define inline __inline
#endif
#ifdef DEBUG
static int DEBUG = 1;
#else
static int DEBUG = 0;
#endif
#define LOG_DEBUG(M, ...) do { \
if (DEBUG && drv->log) \
fprintf(drv->log, "[DEBUG] (%s:%d) " M "\n", __FILE__, __LINE__, __VA_ARGS__); \
} while (0)
#define LOG_ERROR(M, ...) do { \
if (drv->log) \
fprintf(drv->log, "[ERROR] (%s:%d) " M "\n", __FILE__, __LINE__, __VA_ARGS__); \
if (drv->log != stderr) \
fprintf(stderr, "[ERROR] (%s:%d) " M "\n", __FILE__, __LINE__, __VA_ARGS__); \
} while(0)
#define EXTEND_DATASET(n, term_count, term_allocated, dataset) \
term_count += n; \
if (term_count > term_allocated) { \
term_allocated = max(term_count, term_allocated*2); \
dataset = driver_realloc(dataset, sizeof(ErlDrvTermData) * term_allocated); \
}
#define EXTEND_DATASET_DIRECT(n) EXTEND_DATASET(n, term_count, term_allocated, dataset)
#define EXTEND_DATASET_PTR(n) EXTEND_DATASET(n, *term_count_p, *term_allocated_p, *dataset_p)
static void append_to_dataset(int n, ErlDrvTermData* dataset, int term_count, ...) {
int i;
va_list new_terms;
va_start(new_terms, term_count);
for (i = -n; i < 0; i++) {
dataset[term_count + i] = va_arg(new_terms, ErlDrvTermData);
}
va_end(new_terms);
}
static inline ptr_list *add_to_ptr_list(ptr_list *list, void *value_ptr) {
ptr_list* new_node = driver_alloc(sizeof(ptr_list));
new_node->head = value_ptr;
new_node->tail = list;
return new_node;
}
static inline void free_ptr_list(ptr_list *list, void(* free_head)(void *)) {
ptr_list* tail;
while (list) {
tail = list->tail;
(*free_head)(list->head);
driver_free(list);
list = tail;
}
}
#ifndef max // macro in Windows
static inline int max(int a, int b) {
return a >= b ? a : b;
}
#endif
static inline int sql_is_insert(const char *sql) {
// neither strcasestr nor strnicmp are portable, so have to do this
int i;
char *insert = "insert";
for (i = 0; i < 6; i++) {
if ((tolower(sql[i]) != insert[i]) && (sql[i] != ' ')) { return 0; }
}
return 1;
}
#ifdef DEBUG
static void fprint_dataset(FILE* log, ErlDrvTermData* dataset, int term_count);
#endif
// required because driver_free(_binary) are macros in Windows
static void driver_free_fun(void *ptr) {
driver_free(ptr);
}
static void driver_free_binary_fun(void *ptr) {
driver_free_binary((ErlDrvBinary *) ptr);
}
// sdbm from http://www.cse.yorku.ca/~oz/hash.html
unsigned int hash(const char *str) {
unsigned int hash = 0;
unsigned int c = 0;
do {
hash = c + (hash << 6) + (hash << 16) - hash;
c = *str++;
} while (c);
return hash;
}
// Returns a key determined by the file name for an on-disk database,
// determined by the port for a private database.
// This way all access to a single DB will go through one async thread.
static inline unsigned int sql_async_key(char *db_name, ErlDrvPort port) {
const char *memory_db_name = ":memory:";
if (strcmp(db_name, memory_db_name)) {
return hash(db_name);
} else {
#if ERL_DRV_EXTENDED_MAJOR_VERSION > 2 || \
(ERL_DRV_EXTENDED_MAJOR_VERSION == 2 && ERL_DRV_EXTENDED_MINOR_VERSION >= 2)
return driver_async_port_key(port);
#else
return (unsigned int) (uintptr_t) port;
#endif
}
}
static inline int return_error(
sqlite3_drv_t *drv, int error_code, const char *error,
ErlDrvTermData **dataset_p, int *term_count_p, int *term_allocated_p,
int* error_code_p) {
if (error_code_p) {
*error_code_p = error_code;
}
EXTEND_DATASET_PTR(9);
append_to_dataset(9, *dataset_p, *term_count_p,
ERL_DRV_ATOM, drv->atom_error,
ERL_DRV_INT, (ErlDrvTermData) error_code,
ERL_DRV_STRING, (ErlDrvTermData) error, (ErlDrvTermData) strlen(error),
ERL_DRV_TUPLE, (ErlDrvTermData) 3);
// int i;
// for (i = 0; i < *term_count_p; i++) {
// printf("%d\n", (*dataset_p)[i]);
// }
return 0;
}
static inline int output_error(
sqlite3_drv_t *drv, int error_code, const char *error) {
int term_count = 2, term_allocated = 13;
// for some reason breaks if allocated as an array on stack
// even though it shouldn't be extended
ErlDrvTermData *dataset = driver_alloc(sizeof(ErlDrvTermData) * term_allocated);
dataset[0] = ERL_DRV_PORT;
dataset[1] = driver_mk_port(drv->port);
return_error(drv, error_code, error, &dataset, &term_count, &term_allocated, NULL);
term_count += 2;
dataset[11] = ERL_DRV_TUPLE;
dataset[12] = 2;
#ifdef PRE_R16B
driver_output_term(drv->port,
#else
erl_drv_output_term(dataset[1],
#endif
dataset, term_count);
driver_free(dataset);
return 0;
}
static inline int output_db_error(sqlite3_drv_t *drv) {
return output_error(drv, sqlite3_errcode(drv->db), sqlite3_errmsg(drv->db));
}
static inline int output_ok(sqlite3_drv_t *drv) {
// Return {Port, ok}
ErlDrvTermData spec[] = {
ERL_DRV_PORT, driver_mk_port(drv->port),
ERL_DRV_ATOM, drv->atom_ok,
ERL_DRV_TUPLE, 2
};
return
#ifdef PRE_R16B
driver_output_term(drv->port,
#else
erl_drv_output_term(spec[1],
#endif
spec, sizeof(spec) / sizeof(spec[0]));
}
static ErlDrvEntry sqlite3_driver_entry = {
NULL, /* init */
start, /* startup (defined below) */
stop, /* shutdown (defined below) */
NULL, /* output */
NULL, /* ready_input */
NULL, /* ready_output */
"sqlite3_drv", /* the name of the driver */
NULL, /* finish */
NULL, /* handle */
control, /* control */
NULL, /* timeout */
NULL, /* outputv */
ready_async, /* ready_async (defined below) */
NULL, /* flush */
NULL, /* call */
NULL, /* event */
ERL_DRV_EXTENDED_MARKER, /* ERL_DRV_EXTENDED_MARKER */
ERL_DRV_EXTENDED_MAJOR_VERSION, /* ERL_DRV_EXTENDED_MAJOR_VERSION */
ERL_DRV_EXTENDED_MINOR_VERSION, /* ERL_DRV_EXTENDED_MINOR_VERSION */
ERL_DRV_FLAG_USE_PORT_LOCKING, /* ERL_DRV_FLAGs */
NULL /* handle2 */,
NULL /* process_exit */,
#if ERL_DRV_EXTENDED_MAJOR_VERSION > 3 || \
(ERL_DRV_EXTENDED_MAJOR_VERSION == 3 && ERL_DRV_EXTENDED_MINOR_VERSION >= 2)
NULL /* stop_select */,
NULL /* emergency_close */
#else
NULL /* stop_select */
#endif
};
DRIVER_INIT(sqlite3_driver) {
return &sqlite3_driver_entry;
}
// Driver Start
static ErlDrvData start(ErlDrvPort port, char* cmd) {
sqlite3_drv_t* drv = (sqlite3_drv_t*) driver_alloc(sizeof(sqlite3_drv_t));
struct sqlite3 *db = NULL;
int status = 0;
char *db_name = strstr(cmd, " ");
size_t db_name_len;
char *db_name_copy;
#ifdef DEBUG
errno_t file_open_errno;
#ifdef _MSC_VER
const char *log_file = _tempnam(NULL, "erlang-sqlite3-log-");
file_open_errno = fopen_s(drv->log, log_file, "a+");
#else
const char *log_file = tempnam(NULL, "erlang-sqlite3-log-");
drv->log =
fopen(log_file, "ax");
file_open_errno = errno;
#endif
if (file_open_errno) {
fprintf(stderr, "Error creating log file %s; reason %s\n", log_file, strerror(file_open_errno));
// if we can't open the log file we shouldn't hide the data or the problem
drv->log = stderr; // noisy
}
free(log_file);
#else
drv->log = NULL;
#endif
#if defined(_MSC_VER)
#pragma warning(disable: 4306)
#endif
if (!db_name) {
driver_free(drv);
return ERL_DRV_ERROR_BADARG;
} else {
++db_name; // move to first character after ' '
}
// Create and open the database
status = sqlite3_open(db_name, &db);
#if defined(_MSC_VER)
#pragma warning(default: 4306)
#endif
db_name_len = strlen(db_name) + 1; // include terminator
db_name_copy = driver_alloc(sizeof(char) * db_name_len);
strcpy(db_name_copy, db_name);
// Set the state for the driver
drv->port = port;
drv->db = db;
drv->db_name = db_name_copy;
drv->key = sql_async_key(db_name_copy, port);
drv->prepared_stmts = NULL;
drv->prepared_count = 0;
drv->prepared_alloc = 0;
drv->atom_blob = driver_mk_atom("blob");
drv->atom_error = driver_mk_atom("error");
drv->atom_columns = driver_mk_atom("columns");
drv->atom_rows = driver_mk_atom("rows");
drv->atom_null = driver_mk_atom("null");
drv->atom_rowid = driver_mk_atom("rowid");
drv->atom_ok = driver_mk_atom("ok");
drv->atom_done = driver_mk_atom("done");
drv->atom_unknown_cmd = driver_mk_atom("unknown_command");
if (status != SQLITE_OK) {
LOG_ERROR("Unable to open file %s: \"%s\"\n\n", db_name, sqlite3_errmsg(db));
output_db_error(drv);
} else {
LOG_DEBUG("Opened file %s\n", db_name);
output_ok(drv);
}
return (ErlDrvData) drv;
}
// Driver Stop
static void stop(ErlDrvData handle) {
sqlite3_drv_t* drv = (sqlite3_drv_t*) handle;
unsigned int i;
int close_result;
if (drv->prepared_stmts) {
for (i = 0; i < drv->prepared_count; i++) {
sqlite3_finalize(drv->prepared_stmts[i]);
}
driver_free(drv->prepared_stmts);
}
close_result = sqlite3_close(drv->db);
if (close_result != SQLITE_OK) {
LOG_ERROR("Failed to close DB %s, some resources aren't finalized!", drv->db_name);
}
if (drv->log && (drv->log != stderr)) {
fclose(drv->log);
}
driver_free(drv->db_name);
driver_free(drv);
}
// Handle input from Erlang VM
static ErlDrvSSizeT control(
ErlDrvData drv_data, unsigned int command, char *buf,
ErlDrvSizeT len, char **rbuf, ErlDrvSizeT rlen) {
sqlite3_drv_t* drv = (sqlite3_drv_t*) drv_data;
if (len > INT_MAX) {
output_error(drv, SQLITE_MISUSE, "Command size doesn't fit into int type");
} else {
switch (command) {
case CMD_SQL_EXEC:
sql_exec(drv, buf, (int) len);
break;
case CMD_SQL_BIND_AND_EXEC:
sql_bind_and_exec(drv, buf, (int) len);
break;
case CMD_PREPARE:
prepare(drv, buf, (int) len);
break;
case CMD_PREPARED_BIND:
prepared_bind(drv, buf, (int) len);
break;
case CMD_PREPARED_STEP:
prepared_step(drv, buf, (int) len);
break;
case CMD_PREPARED_RESET:
prepared_reset(drv, buf, (int) len);
break;
case CMD_PREPARED_CLEAR_BINDINGS:
prepared_clear_bindings(drv, buf, (int) len);
break;
case CMD_PREPARED_FINALIZE:
prepared_finalize(drv, buf, (int) len);
break;
case CMD_PREPARED_COLUMNS:
prepared_columns(drv, buf, (int) len);
break;
case CMD_SQL_EXEC_SCRIPT:
sql_exec_script(drv, buf, (int) len);
break;
case CMD_ENABLE_LOAD_EXTENSION:
enable_load_extension(drv, buf, (int) len);
break;
case CMD_CHANGES:
changes(drv, buf, (int) len);
break;
default:
unknown(drv, buf, (int) len);
}
}
return 0;
}
static int changes(sqlite3_drv_t *drv, char *buf, int len) {
int changes = sqlite3_changes(drv->db);
ErlDrvTermData spec[6];
spec[0] = ERL_DRV_PORT;
spec[1] = driver_mk_port(drv->port);
spec[2] = ERL_DRV_UINT;
spec[3] = changes;
spec[4] = ERL_DRV_TUPLE;
spec[5] = 2;
return
#ifdef PRE_R16B
driver_output_term(drv->port,
#else
erl_drv_output_term(spec[1],
#endif
spec, sizeof(spec) / sizeof(spec[0]));
}
static int enable_load_extension(sqlite3_drv_t* drv, char *buf, int len) {
#ifdef ERLANG_SQLITE3_LOAD_EXTENSION
char enable = buf[0];
int result = sqlite3_enable_load_extension(drv->db, (int) enable);
if (result) {
output_db_error(drv);
return result;
} else {
output_ok(drv);
return 0;
}
#else
output_error(drv, SQLITE_MISUSE, "extension loading not enabled, recompile erlang-sqlite3 with ERLANG_SQLITE3_LOAD_EXTENSION defined");
return -1;
#endif
}
static inline async_sqlite3_command *make_async_command_statement(
sqlite3_drv_t *drv, sqlite3_stmt *statement, int finalize) {
async_sqlite3_command *result =
(async_sqlite3_command *) driver_alloc(sizeof(async_sqlite3_command));
memset(result, 0, sizeof(async_sqlite3_command));
result->driver_data = drv;
result->type = t_stmt;
result->statement = statement;
result->finalize_statement_on_free = finalize;
return result;
}
static inline async_sqlite3_command *make_async_command_script(
sqlite3_drv_t *drv, char *script, int script_length) {
async_sqlite3_command *result =
(async_sqlite3_command *) driver_alloc(sizeof(async_sqlite3_command));
char *script_copy = driver_alloc(sizeof(char) * script_length);
memset(result, 0, sizeof(async_sqlite3_command));
memcpy(script_copy, script, sizeof(char) * script_length);
result->driver_data = drv;
result->type = t_script;
result->script = script_copy;
result->end = script_copy + script_length;
return result;
}
static inline void exec_async_command(
sqlite3_drv_t *drv, void (*async_invoke)(void*),
async_sqlite3_command *async_command) {
// Check is required because we are sometimes accessing
// sqlite3 from the emulator thread. Could also be fixed
// by making _all_ access except start/stop go through driver_async
if (sqlite3_threadsafe()) {
long status = driver_async(drv->port, &drv->key, async_invoke,
async_command, sql_free_async);
// see https://groups.google.com/d/msg/erlang-programming/XiFR6xxhGos/B6ARBIlvpMUJ
if (status < 0) {
LOG_ERROR("driver_async call failed", 0);
output_error(drv, SQLITE_ERROR, "driver_async call failed");
}
} else {
async_invoke(async_command);
ready_async((ErlDrvData) drv, (ErlDrvThreadData) async_command);
}
}
static inline int sql_exec_statement(
sqlite3_drv_t *drv, sqlite3_stmt *statement) {
async_sqlite3_command *async_command = make_async_command_statement(drv, statement, 1);
LOG_DEBUG("Driver async: %d %p\n", SQLITE_VERSION_NUMBER, async_command->statement);
exec_async_command(drv, sql_exec_async, async_command);
return 0;
}
static int sql_exec(sqlite3_drv_t *drv, char *command, int command_size) {
int result;
const char *rest;
sqlite3_stmt *statement;
LOG_DEBUG("Preexec: %.*s\n", command_size, command);
result = sqlite3_prepare_v2(drv->db, command, command_size, &statement, &rest);
if (result != SQLITE_OK) {
return output_db_error(drv);
} else if (statement == NULL) {
return output_error(drv, SQLITE_MISUSE, "empty statement");
}
return sql_exec_statement(drv, statement);
}
static int sql_exec_script(sqlite3_drv_t *drv, char *command, int command_size) {
async_sqlite3_command *async_command = make_async_command_script(drv, command, command_size);
LOG_DEBUG("Driver async: %d %p\n", SQLITE_VERSION_NUMBER, async_command->statement);
exec_async_command(drv, sql_exec_async, async_command);
return 0;
}
static inline int decode_and_bind_param(
sqlite3_drv_t *drv, char *buffer, int *p_index,
sqlite3_stmt *statement, int param_index, int *p_type, int *p_size) {
int result;
sqlite3_int64 int64_val;
double double_val;
char* char_buf_val;
long bin_size;
ei_get_type(buffer, p_index, p_type, p_size);
switch (*p_type) {
case ERL_SMALL_INTEGER_EXT:
case ERL_INTEGER_EXT:
case ERL_SMALL_BIG_EXT:
case ERL_LARGE_BIG_EXT:
ei_decode_longlong(buffer, p_index, &int64_val);
result = sqlite3_bind_int64(statement, param_index, int64_val);
break;
case ERL_FLOAT_EXT:
#ifdef NEW_FLOAT_EXT
case NEW_FLOAT_EXT: // what's the difference?
#endif
ei_decode_double(buffer, p_index, &double_val);
result = sqlite3_bind_double(statement, param_index, double_val);
break;
case ERL_ATOM_EXT:
// include space for null separator
char_buf_val = driver_alloc((*p_size + 1) * sizeof(char));
ei_decode_atom(buffer, p_index, char_buf_val);
if (strncmp(char_buf_val, "null", 5) == 0) {
result = sqlite3_bind_null(statement, param_index);
} else {
output_error(drv, SQLITE_MISUSE, "Non-null atom as parameter");
return 1;
}
break;
case ERL_STRING_EXT:
// include space for null separator
char_buf_val = driver_alloc((*p_size + 1) * sizeof(char));
ei_decode_string(buffer, p_index, char_buf_val);
result = sqlite3_bind_text(statement, param_index, char_buf_val, *p_size, &driver_free_fun);
break;
case ERL_BINARY_EXT:
char_buf_val = driver_alloc(*p_size * sizeof(char));
ei_decode_binary(buffer, p_index, char_buf_val, &bin_size);
result = sqlite3_bind_text(statement, param_index, char_buf_val, *p_size, &driver_free_fun);
break;
case ERL_SMALL_TUPLE_EXT:
// assume this is {blob, Blob}
ei_get_type(buffer, p_index, p_type, p_size);
ei_decode_tuple_header(buffer, p_index, p_size);
if (*p_size != 2) {
output_error(drv, SQLITE_MISUSE, "bad parameter type");
return 1;
}
ei_skip_term(buffer, p_index); // skipped the atom 'blob'
ei_get_type(buffer, p_index, p_type, p_size);
if (*p_type != ERL_BINARY_EXT) {
output_error(drv, SQLITE_MISUSE, "bad parameter type");
return 1;
}
char_buf_val = driver_alloc(*p_size * sizeof(char));
ei_decode_binary(buffer, p_index, char_buf_val, &bin_size);
result = sqlite3_bind_blob(statement, param_index, char_buf_val, *p_size, &driver_free_fun);
break;
default:
output_error(drv, SQLITE_MISUSE, "bad parameter type");
return 1;
}
if (result != SQLITE_OK) {
output_db_error(drv);
return result;
}
return SQLITE_OK;
}
static int bind_parameters(
sqlite3_drv_t *drv, char *buffer, int buffer_size, int *p_index,
sqlite3_stmt *statement, int *p_type, int *p_size) {
// decoding parameters
int i, cur_list_size = -1, param_index = 1, param_indices_are_explicit = 0, result = 0;
long param_index_long;
char param_name[MAXATOMLEN + 1]; // parameter names shouldn't be longer than 256!
char *acc_string;
result = ei_decode_list_header(buffer, p_index, &cur_list_size);
if (result) {
// probably all parameters are integers between 0 and 255
// and the list was encoded as string (see ei documentation)
ei_get_type(buffer, p_index, p_type, p_size);
if (*p_type != ERL_STRING_EXT) {
return output_error(drv, SQLITE_ERROR,
"error while binding parameters");
}
acc_string = driver_alloc(sizeof(char) * (*p_size + 1));
ei_decode_string(buffer, p_index, acc_string);
for (param_index = 1; param_index <= *p_size; param_index++) {
sqlite3_bind_int(statement, param_index, (int) (unsigned char) acc_string[param_index - 1]);
}
driver_free(acc_string);
return 0;
}
for (i = 0; i < cur_list_size; i++) {
if (*p_index >= buffer_size) {
return output_error(drv, SQLITE_ERROR,
"error while binding parameters");
}
ei_get_type(buffer, p_index, p_type, p_size);
if (*p_type == ERL_SMALL_TUPLE_EXT) {
int old_index = *p_index;
// param with name or explicit index
param_indices_are_explicit = 1;
if (*p_size != 2) {
return output_error(drv, SQLITE_MISUSE,
"tuple should contain index or name, and value");
}
ei_decode_tuple_header(buffer, p_index, p_size);
ei_get_type(buffer, p_index, p_type, p_size);
// first element of tuple is int (index), atom, or string (name)
switch (*p_type) {
case ERL_SMALL_INTEGER_EXT:
case ERL_INTEGER_EXT:
ei_decode_long(buffer, p_index, ¶m_index_long);
param_index = param_index_long;
break;
case ERL_ATOM_EXT:
ei_decode_atom(buffer, p_index, param_name);
// insert zero terminator
param_name[*p_size] = '\0';
if (strncmp(param_name, "blob", 5) == 0) {
// this isn't really a parameter name!
*p_index = old_index;
param_indices_are_explicit = 0;
goto IMPLICIT_INDEX; // yuck
} else {
param_index = sqlite3_bind_parameter_index(statement, param_name);
}
break;
case ERL_STRING_EXT:
if (*p_size >= MAXATOMLEN) {
return output_error(drv, SQLITE_TOOBIG, "parameter name too long");
}
ei_decode_string(buffer, p_index, param_name);
// insert zero terminator
param_name[*p_size] = '\0';
param_index = sqlite3_bind_parameter_index(statement, param_name);
break;
default:
return output_error(drv, SQLITE_MISMATCH,
"parameter index must be given as integer, atom, or string");
}
result = decode_and_bind_param(
drv, buffer, p_index, statement, param_index, p_type, p_size);
if (result != SQLITE_OK) {
return result; // error has already been output
}
}
else {
IMPLICIT_INDEX:
if (param_indices_are_explicit) {
return output_error(drv, SQLITE_MISUSE,
"parameters without indices shouldn't follow indexed or named parameters");
}
result = decode_and_bind_param(
drv, buffer, p_index, statement, param_index, p_type, p_size);
if (result != SQLITE_OK) {
return result; // error has already been output
}
++param_index;
}
}
return result;
}
static void get_columns(
sqlite3_drv_t *drv, sqlite3_stmt *statement, int column_count, int base,
int *term_count_p, int *term_allocated_p, ptr_list** p_ptrs, ErlDrvTermData **dataset_p) {
int i;
EXTEND_DATASET_PTR(column_count * 3 + 3);
for (i = 0; i < column_count; i++) {
const char *column_name = sqlite3_column_name(statement, i);
size_t column_name_length = strlen(column_name);
char *column_name_copy = driver_alloc(sizeof(char) * (column_name_length + 1));
strcpy(column_name_copy, column_name);
*p_ptrs = add_to_ptr_list(*p_ptrs, column_name_copy);
LOG_DEBUG("Column: %s\n", column_name_copy);
(*dataset_p)[base + (i * 3)] = ERL_DRV_STRING;
(*dataset_p)[base + (i * 3) + 1] = (ErlDrvTermData) column_name_copy;
(*dataset_p)[base + (i * 3) + 2] = column_name_length;
}
(*dataset_p)[base + column_count * 3 + 0] = ERL_DRV_NIL;
(*dataset_p)[base + column_count * 3 + 1] = ERL_DRV_LIST;
(*dataset_p)[base + column_count * 3 + 2] = column_count + 1;
}
static int sql_bind_and_exec(sqlite3_drv_t *drv, char *buffer, int buffer_size) {
int result;
int index = 0;
int type, size;
const char *rest;
sqlite3_stmt *statement;
long bin_size;
char *command;
LOG_DEBUG("Preexec: %.*s\n", buffer_size, buffer);
ei_decode_version(buffer, &index, NULL);
result = ei_decode_tuple_header(buffer, &index, &size);
if (result || (size != 2)) {
return output_error(drv, SQLITE_MISUSE,
"Expected a tuple of SQL command and params");
}
// decode SQL statement
ei_get_type(buffer, &index, &type, &size);
// TODO support any iolists
if (type != ERL_BINARY_EXT) {
return output_error(drv, SQLITE_MISUSE,
"SQL should be sent as an Erlang binary");
}
command = driver_alloc(size * sizeof(char));
ei_decode_binary(buffer, &index, command, &bin_size);
// assert(bin_size == size)
result = sqlite3_prepare_v2(drv->db, command, size, &statement, &rest);
driver_free(command);
if (result != SQLITE_OK) {
return output_db_error(drv);
} else if (statement == NULL) {
return output_error(drv, SQLITE_MISUSE, "empty statement");
}
result = bind_parameters(drv, buffer, buffer_size, &index, statement, &type, &size);
if (result == SQLITE_OK) {
return sql_exec_statement(drv, statement);
} else {
sqlite3_finalize(statement);
return result; // error has already been output
}
}
static void sql_free_async(void *_async_command) {
async_sqlite3_command *async_command =
(async_sqlite3_command *) _async_command;
driver_free(async_command->dataset);
free_ptr_list(async_command->ptrs, &driver_free_fun);
free_ptr_list(async_command->binaries, &driver_free_binary_fun);
if ((async_command->type == t_stmt) &&
async_command->finalize_statement_on_free &&
async_command->statement) {
sqlite3_finalize(async_command->statement);
async_command->statement = NULL;
} else if (async_command->type == t_script) {
driver_free(async_command->script);
}
driver_free(async_command);
}
static int sql_exec_one_statement(
sqlite3_stmt *statement, async_sqlite3_command *async_command,
int *term_count_p, int *term_allocated_p, ErlDrvTermData **dataset_p) {
int column_count = sqlite3_column_count(statement);
int row_count = 0, next_row;
int base_term_count;
int has_error = 0; // bool
sqlite3_drv_t *drv = async_command->driver_data;
ptr_list **ptrs_p = &(async_command->ptrs);
ptr_list **binaries_p = &(async_command->binaries);
// printf("\nsql_exec_one_statement. SQL:\n%s\n Term count: %d, terms alloc: %d\n", sqlite3_sql(statement), *term_count_p, *term_allocated_p);
int i;
if (column_count > 0) {
EXTEND_DATASET_PTR(2);
append_to_dataset(2, *dataset_p, *term_count_p, ERL_DRV_ATOM, drv->atom_columns);
base_term_count = *term_count_p;
get_columns(
drv, statement, column_count, base_term_count, term_count_p, term_allocated_p, ptrs_p, dataset_p);
EXTEND_DATASET_PTR(4);
append_to_dataset(4, *dataset_p, base_term_count + column_count * 3 + 7,
ERL_DRV_TUPLE, (ErlDrvTermData) 2, ERL_DRV_ATOM, drv->atom_rows);
}
LOG_DEBUG("Exec: %s\n", sqlite3_sql(statement));
while ((next_row = sqlite3_step(statement)) == SQLITE_ROW) {
for (i = 0; i < column_count; i++) {
LOG_DEBUG("Column %d type: %d\n", i, sqlite3_column_type(statement, i));
switch (sqlite3_column_type(statement, i)) {
case SQLITE_INTEGER: {
ErlDrvSInt64 *int64_ptr = driver_alloc(sizeof(ErlDrvSInt64));
*int64_ptr = (ErlDrvSInt64) sqlite3_column_int64(statement, i);
*ptrs_p = add_to_ptr_list(*ptrs_p, int64_ptr);
EXTEND_DATASET_PTR(2);
append_to_dataset(2, *dataset_p, *term_count_p, ERL_DRV_INT64, (ErlDrvTermData) int64_ptr);
break;
}
case SQLITE_FLOAT: {
double *float_ptr = driver_alloc(sizeof(double));
*float_ptr = sqlite3_column_double(statement, i);
*ptrs_p = add_to_ptr_list(*ptrs_p, float_ptr);
EXTEND_DATASET_PTR(2);
append_to_dataset(2, *dataset_p, *term_count_p, ERL_DRV_FLOAT, (ErlDrvTermData) float_ptr);
break;
}
case SQLITE_BLOB: {
int bytes = sqlite3_column_bytes(statement, i);
ErlDrvBinary* binary = driver_alloc_binary(bytes);
binary->orig_size = bytes;
memcpy(binary->orig_bytes,
sqlite3_column_blob(statement, i), bytes);
*binaries_p = add_to_ptr_list(*binaries_p, binary);
EXTEND_DATASET_PTR(8);
append_to_dataset(8, *dataset_p, *term_count_p,
ERL_DRV_ATOM, drv->atom_blob,
ERL_DRV_BINARY, (ErlDrvTermData) binary, (ErlDrvTermData) bytes, (ErlDrvTermData) 0,
ERL_DRV_TUPLE, (ErlDrvTermData) 2);
break;
}
case SQLITE_TEXT: {
int bytes = sqlite3_column_bytes(statement, i);
ErlDrvBinary* binary = driver_alloc_binary(bytes);
binary->orig_size = bytes;
memcpy(binary->orig_bytes,
sqlite3_column_blob(statement, i), bytes);
*binaries_p = add_to_ptr_list(*binaries_p, binary);
EXTEND_DATASET_PTR(4);
append_to_dataset(4, *dataset_p, *term_count_p,
ERL_DRV_BINARY, (ErlDrvTermData) binary, (ErlDrvTermData) bytes, (ErlDrvTermData) 0);
break;
}
case SQLITE_NULL: {
EXTEND_DATASET_PTR(2);
append_to_dataset(2, *dataset_p, *term_count_p, ERL_DRV_ATOM, drv->atom_null);
break;
}
}
}
EXTEND_DATASET_PTR(2);
append_to_dataset(2, *dataset_p, *term_count_p, ERL_DRV_TUPLE, (ErlDrvTermData) column_count);
row_count++;
}
if (next_row != SQLITE_DONE) {
if (column_count == 0) {
return_error(drv, next_row, sqlite3_errmsg(drv->db),
dataset_p, term_count_p,
term_allocated_p, &async_command->error_code);
async_command->finalize_statement_on_free = 1;
return 1;
} else {
has_error = 1;
}
}
if (column_count > 0) {
EXTEND_DATASET_PTR(5);
append_to_dataset(5, *dataset_p, *term_count_p,
ERL_DRV_NIL, ERL_DRV_LIST, (ErlDrvTermData) (row_count + 1),
ERL_DRV_TUPLE, (ErlDrvTermData) 2);
if (has_error) {
return_error(drv, next_row, sqlite3_errmsg(drv->db),
dataset_p, term_count_p,
term_allocated_p, &async_command->error_code);
}
EXTEND_DATASET_PTR(3);
append_to_dataset(3, *dataset_p, *term_count_p,
ERL_DRV_NIL, ERL_DRV_LIST, (ErlDrvTermData) (3 + has_error));
} else if (sql_is_insert(sqlite3_sql(statement))) {
ErlDrvSInt64 *rowid_ptr = driver_alloc(sizeof(ErlDrvSInt64));
*rowid_ptr = (ErlDrvSInt64) sqlite3_last_insert_rowid(drv->db);
*ptrs_p = add_to_ptr_list(*ptrs_p, rowid_ptr);
EXTEND_DATASET_PTR(6);
append_to_dataset(6, *dataset_p, *term_count_p,
ERL_DRV_ATOM, drv->atom_rowid,
ERL_DRV_INT64, (ErlDrvTermData) rowid_ptr,
ERL_DRV_TUPLE, (ErlDrvTermData) 2);
} else {
EXTEND_DATASET_PTR(2);
append_to_dataset(2, *dataset_p, *term_count_p, ERL_DRV_ATOM, drv->atom_ok);
}
LOG_DEBUG("Total term count: %p %d, rows count: %dx%d\n",
statement, *term_count_p, column_count, row_count);
async_command->finalize_statement_on_free = 1;
return has_error;
}
static void sql_exec_async(void *_async_command) {
async_sqlite3_command *async_command = (async_sqlite3_command *) _async_command;
sqlite3_stmt *statement = NULL;
int result;
const char *rest;
const char *end;
int num_statements = 0;
int term_count = 0, term_allocated = 0;
ErlDrvTermData *dataset = NULL;
sqlite3_drv_t *drv = async_command->driver_data;
EXTEND_DATASET_DIRECT(2);
append_to_dataset(2, dataset, term_count, ERL_DRV_PORT, driver_mk_port(drv->port));
switch (async_command->type) {
case t_stmt:
statement = async_command->statement;
sql_exec_one_statement(statement, async_command, &term_count,
&term_allocated, &dataset);
break;
case t_script:
rest = async_command->script;
end = async_command->end;
while ((rest < end) && !(async_command->error_code)) {
result = sqlite3_prepare_v2(drv->db, rest, (int) (end - rest), &statement, &rest);
if (result != SQLITE_OK) {
// sqlite doc says statement will be NULL here, so no need to finalize it
num_statements++;
return_error(drv, result, sqlite3_errmsg(drv->db), &dataset,
&term_count, &term_allocated, &async_command->error_code);
break;
} else if (statement == NULL) {
// the script has completed
break;
} else {
num_statements++;
result = sql_exec_one_statement(statement, async_command, &term_count,
&term_allocated, &dataset);
sqlite3_finalize(statement);
if (result) {
break;
}
}
}
EXTEND_DATASET_DIRECT(3);
append_to_dataset(3, dataset, term_count,
ERL_DRV_NIL, ERL_DRV_LIST, (ErlDrvTermData) (num_statements + 1));
}
EXTEND_DATASET_DIRECT(2);
append_to_dataset(2, dataset, term_count, ERL_DRV_TUPLE, (ErlDrvTermData) 2);
// print_dataset(dataset, term_count);
async_command->term_count = term_count;
async_command->term_allocated = term_allocated;
async_command->dataset = dataset;
}
static void sql_step_async(void *_async_command) {
async_sqlite3_command *async_command = (async_sqlite3_command *) _async_command;
int term_count = 0;
int term_allocated = 0;
ErlDrvTermData *dataset = NULL;
sqlite3_drv_t *drv = async_command->driver_data;
int column_count = 0;
sqlite3_stmt *statement = async_command->statement;
ptr_list *ptrs = NULL;
ptr_list *binaries = NULL;
int i;
int result;
switch(result = sqlite3_step(statement)) {
case SQLITE_ROW:
column_count = sqlite3_column_count(statement);
EXTEND_DATASET_DIRECT(2);
append_to_dataset(2, dataset, term_count, ERL_DRV_PORT, driver_mk_port(drv->port));
for (i = 0; i < column_count; i++) {
LOG_DEBUG("Column %d type: %d\n", i, sqlite3_column_type(statement, i));
switch (sqlite3_column_type(statement, i)) {
case SQLITE_INTEGER: {
ErlDrvSInt64 *int64_ptr = driver_alloc(sizeof(ErlDrvSInt64));
*int64_ptr = (ErlDrvSInt64) sqlite3_column_int64(statement, i);
ptrs = add_to_ptr_list(ptrs, int64_ptr);
EXTEND_DATASET_DIRECT(2);
append_to_dataset(2, dataset, term_count, ERL_DRV_INT64, (ErlDrvTermData) int64_ptr);