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php-src/ext/pdo_pgsql/pgsql_statement.c

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/*
+----------------------------------------------------------------------+
| PHP Version 5 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2005 The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.0 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.php.net/license/3_0.txt. |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Edin Kadribasic <edink@emini.dk> |
| Ilia Alshanestsky <ilia@prohost.org> |
| Wez Furlong <wez@php.net> |
+----------------------------------------------------------------------+
*/
/* $Id$ */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "php.h"
#include "php_ini.h"
#include "ext/standard/info.h"
#include "pdo/php_pdo.h"
#include "pdo/php_pdo_driver.h"
#include "php_pdo_pgsql.h"
#include "php_pdo_pgsql_int.h"
/* from postgresql/src/include/catalog/pg_type.h */
#define BOOLOID 16
#define BYTEAOID 17
#define INT8OID 20
#define INT2OID 21
#define INT4OID 23
#define TEXTOID 25
#define OIDOID 26
static int pgsql_stmt_dtor(pdo_stmt_t *stmt TSRMLS_DC)
{
pdo_pgsql_stmt *S = (pdo_pgsql_stmt*)stmt->driver_data;
if (S->result) {
/* free the resource */
PQclear(S->result);
S->result = NULL;
}
#if HAVE_PQPREPARE
if (S->stmt_name) {
pdo_pgsql_db_handle *H = S->H;
char *q = NULL;
PGresult *res;
spprintf(&q, 0, "DEALLOCATE %s", S->stmt_name);
res = PQexec(H->server, q);
efree(q);
if (res) PQclear(res);
efree(S->stmt_name);
S->stmt_name = NULL;
}
if (S->param_lengths) {
efree(S->param_lengths);
S->param_lengths = NULL;
}
if (S->param_values) {
efree(S->param_values);
S->param_values = NULL;
}
if (S->param_formats) {
efree(S->param_formats);
S->param_formats = NULL;
}
if (S->param_types) {
efree(S->param_types);
S->param_types = NULL;
}
if (S->query) {
efree(S->query);
S->query = NULL;
}
#endif
if (S->cursor_name) {
pdo_pgsql_db_handle *H = S->H;
char *q = NULL;
PGresult *res;
spprintf(&q, 0, "CLOSE %s", S->cursor_name);
res = PQexec(H->server, q);
efree(q);
if (res) PQclear(res);
efree(S->cursor_name);
S->cursor_name = NULL;
}
if(S->cols) {
efree(S->cols);
S->cols = NULL;
}
efree(S);
stmt->driver_data = NULL;
return 1;
}
static int pgsql_stmt_execute(pdo_stmt_t *stmt TSRMLS_DC)
{
pdo_pgsql_stmt *S = (pdo_pgsql_stmt*)stmt->driver_data;
pdo_pgsql_db_handle *H = S->H;
ExecStatusType status;
/* ensure that we free any previous unfetched results */
if(S->result) {
PQclear(S->result);
S->result = NULL;
}
S->current_row = 0;
#if HAVE_PQPREPARE
if (S->stmt_name) {
/* using a prepared statement */
if (!S->is_prepared) {
stmt_retry:
/* we deferred the prepare until now, because we didn't
* know anything about the parameter types; now we do */
S->result = PQprepare(H->server, S->stmt_name, S->query,
stmt->bound_params ? zend_hash_num_elements(stmt->bound_params) : 0,
S->param_types);
status = PQresultStatus(S->result);
switch (status) {
case PGRES_COMMAND_OK:
case PGRES_TUPLES_OK:
/* it worked */
S->is_prepared = 1;
PQclear(S->result);
break;
default: {
char *sqlstate = pdo_pgsql_sqlstate(S->result);
/* 42P05 means that the prepared statement already existed. this can happen if you use
* a connection pooling software line pgpool which doesn't close the db-connection once
* php disconnects. if php dies (no chanche to run RSHUTDOWN) during execution it has no
* chance to DEALLOCATE the prepared statements it has created. so, if we hit a 42P05 we
* deallocate it and retry ONCE (thies 2005.12.15)
*/
if (!strcmp(sqlstate, "42P05")) {
char buf[100]; /* stmt_name == "pdo_pgsql_cursor_%08x" */
PGresult *res;
snprintf(buf, sizeof(buf), "DEALLOCATE %s", S->stmt_name);
res = PQexec(H->server, buf);
if (res) {
PQclear(res);
}
goto stmt_retry;
} else {
pdo_pgsql_error_stmt(stmt, status, sqlstate);
return 0;
}
}
}
}
S->result = PQexecPrepared(H->server, S->stmt_name,
stmt->bound_params ?
zend_hash_num_elements(stmt->bound_params) :
0,
(const char**)S->param_values,
S->param_lengths,
S->param_formats,
0);
} else
#endif
if (S->cursor_name) {
char *q = NULL;
spprintf(&q, 0, "DECLARE %s CURSOR FOR %s", S->cursor_name, stmt->active_query_string);
S->result = PQexec(H->server, q);
efree(q);
} else {
S->result = PQexec(H->server, stmt->active_query_string);
}
status = PQresultStatus(S->result);
if (status != PGRES_COMMAND_OK && status != PGRES_TUPLES_OK) {
pdo_pgsql_error_stmt(stmt, status, pdo_pgsql_sqlstate(S->result));
return 0;
}
if(!stmt->executed) {
stmt->column_count = (int) PQnfields(S->result);
S->cols = ecalloc(stmt->column_count, sizeof(pdo_pgsql_column));
}
if (status == PGRES_COMMAND_OK) {
stmt->row_count = (long)atoi(PQcmdTuples(S->result));
H->pgoid = PQoidValue(S->result);
} else {
stmt->row_count = (long)PQntuples(S->result);
}
return 1;
}
static int pgsql_stmt_param_hook(pdo_stmt_t *stmt, struct pdo_bound_param_data *param,
enum pdo_param_event event_type TSRMLS_DC)
{
pdo_pgsql_stmt *S = (pdo_pgsql_stmt*)stmt->driver_data;
#if HAVE_PQPREPARE
if (S->stmt_name && param->is_param) {
switch (event_type) {
case PDO_PARAM_EVT_FREE:
if (param->driver_data) {
efree(param->driver_data);
}
break;
case PDO_PARAM_EVT_ALLOC:
/* decode name from $1, $2 into 0, 1 etc. */
if (param->name) {
if (param->name[0] == '$') {
param->paramno = atoi(param->name + 1);
} else {
/* resolve parameter name to rewritten name */
char *nameptr;
if (SUCCESS == zend_hash_find(stmt->bound_param_map,
param->name, param->namelen + 1, (void**)&nameptr)) {
param->paramno = atoi(nameptr + 1) - 1;
} else {
pdo_pgsql_error_stmt(stmt, PGRES_FATAL_ERROR, "HY093");
return 0;
}
}
}
break;
case PDO_PARAM_EVT_EXEC_PRE:
if (!S->param_values) {
S->param_values = ecalloc(
zend_hash_num_elements(stmt->bound_params),
sizeof(char*));
S->param_lengths = ecalloc(
zend_hash_num_elements(stmt->bound_params),
sizeof(int));
S->param_formats = ecalloc(
zend_hash_num_elements(stmt->bound_params),
sizeof(int));
S->param_types = ecalloc(
zend_hash_num_elements(stmt->bound_params),
sizeof(Oid));
}
if (param->paramno >= 0) {
if (PDO_PARAM_TYPE(param->param_type) == PDO_PARAM_LOB &&
Z_TYPE_P(param->parameter) == IS_RESOURCE) {
php_stream *stm;
php_stream_from_zval_no_verify(stm, &param->parameter);
if (stm) {
if (php_stream_is(stm, &pdo_pgsql_lob_stream_ops)) {
struct pdo_pgsql_lob_self *self = (struct pdo_pgsql_lob_self*)stm->abstract;
pdo_pgsql_bound_param *P = param->driver_data;
if (P == NULL) {
P = ecalloc(1, sizeof(*P));
param->driver_data = P;
}
P->oid = htonl(self->oid);
S->param_values[param->paramno] = (char*)&P->oid;
S->param_lengths[param->paramno] = sizeof(P->oid);
S->param_formats[param->paramno] = 1;
S->param_types[param->paramno] = OIDOID;
return 1;
} else {
SEPARATE_ZVAL_IF_NOT_REF(&param->parameter);
Z_TYPE_P(param->parameter) = IS_STRING;
Z_STRLEN_P(param->parameter) = php_stream_copy_to_mem(stm,
&Z_STRVAL_P(param->parameter), PHP_STREAM_COPY_ALL, 0);
}
} else {
/* expected a stream resource */
pdo_pgsql_error_stmt(stmt, PGRES_FATAL_ERROR, "HY105");
return 0;
}
}
if (PDO_PARAM_TYPE(param->param_type) == PDO_PARAM_NULL ||
Z_TYPE_P(param->parameter) == IS_NULL) {
S->param_values[param->paramno] = NULL;
S->param_lengths[param->paramno] = 0;
} else if (Z_TYPE_P(param->parameter) == IS_BOOL) {
S->param_values[param->paramno] = Z_BVAL_P(param->parameter) ? "t" : "f";
S->param_lengths[param->paramno] = 1;
S->param_formats[param->paramno] = 0;
} else {
convert_to_string(param->parameter);
S->param_values[param->paramno] = Z_STRVAL_P(param->parameter);
S->param_lengths[param->paramno] = Z_STRLEN_P(param->parameter);
S->param_formats[param->paramno] = 0;
}
if (PDO_PARAM_TYPE(param->param_type) == PDO_PARAM_LOB) {
S->param_types[param->paramno] = 0;
S->param_formats[param->paramno] = 1;
} else {
S->param_types[param->paramno] = 0;
}
}
break;
}
}
#endif
return 1;
}
static int pgsql_stmt_fetch(pdo_stmt_t *stmt,
enum pdo_fetch_orientation ori, long offset TSRMLS_DC)
{
pdo_pgsql_stmt *S = (pdo_pgsql_stmt*)stmt->driver_data;
if (S->cursor_name) {
char *ori_str;
char *q = NULL;
ExecStatusType status;
switch (ori) {
case PDO_FETCH_ORI_NEXT: ori_str = "FORWARD"; break;
case PDO_FETCH_ORI_PRIOR: ori_str = "BACKWARD"; break;
case PDO_FETCH_ORI_REL: ori_str = "RELATIVE"; break;
default:
return 0;
}
spprintf(&q, 0, "FETCH %s %ld FROM %s", ori_str, offset, S->cursor_name);
S->result = PQexec(S->H->server, q);
status = PQresultStatus(S->result);
if (status != PGRES_COMMAND_OK && status != PGRES_TUPLES_OK) {
pdo_pgsql_error_stmt(stmt, status, pdo_pgsql_sqlstate(S->result));
return 0;
}
S->current_row = 1;
return 1;
} else {
if (S->current_row < stmt->row_count) {
S->current_row++;
return 1;
} else {
return 0;
}
}
}
static int pgsql_stmt_describe(pdo_stmt_t *stmt, int colno TSRMLS_DC)
{
pdo_pgsql_stmt *S = (pdo_pgsql_stmt*)stmt->driver_data;
struct pdo_column_data *cols = stmt->columns;
struct pdo_bound_param_data *param;
if (!S->result) {
return 0;
}
cols[colno].name = estrdup(PQfname(S->result, colno));
cols[colno].namelen = strlen(cols[colno].name);
cols[colno].maxlen = PQfsize(S->result, colno);
cols[colno].precision = PQfmod(S->result, colno);
S->cols[colno].pgsql_type = PQftype(S->result, colno);
switch(S->cols[colno].pgsql_type) {
case BOOLOID:
cols[colno].param_type = PDO_PARAM_BOOL;
break;
case OIDOID:
/* did the user bind the column as a LOB ? */
if (stmt->bound_columns && (
SUCCESS == zend_hash_index_find(stmt->bound_columns,
colno, (void**)&param) ||
SUCCESS == zend_hash_find(stmt->bound_columns,
cols[colno].name, cols[colno].namelen,
(void**)&param))) {
if (PDO_PARAM_TYPE(param->param_type) == PDO_PARAM_LOB) {
cols[colno].param_type = PDO_PARAM_LOB;
break;
}
}
cols[colno].param_type = PDO_PARAM_INT;
break;
case INT2OID:
case INT4OID:
cols[colno].param_type = PDO_PARAM_INT;
break;
case INT8OID:
if (sizeof(long)>=8) {
cols[colno].param_type = PDO_PARAM_INT;
} else {
cols[colno].param_type = PDO_PARAM_STR;
}
break;
case BYTEAOID:
cols[colno].param_type = PDO_PARAM_LOB;
break;
default:
cols[colno].param_type = PDO_PARAM_STR;
}
return 1;
}
/* PQunescapeBytea() from PostgreSQL 7.3 to provide bytea unescape feature to 7.2 users.
Renamed to php_pdo_pgsql_unescape_bytea() */
/*
* PQunescapeBytea - converts the null terminated string representation
* of a bytea, strtext, into binary, filling a buffer. It returns a
* pointer to the buffer which is NULL on error, and the size of the
* buffer in retbuflen. The pointer may subsequently be used as an
* argument to the function free(3). It is the reverse of PQescapeBytea.
*
* The following transformations are reversed:
* '\0' == ASCII 0 == \000
* '\'' == ASCII 39 == \'
* '\\' == ASCII 92 == \\
*
* States:
* 0 normal 0->1->2->3->4
* 1 \ 1->5
* 2 \0 1->6
* 3 \00
* 4 \000
* 5 \'
* 6 \\
*/
static unsigned char *php_pdo_pgsql_unescape_bytea(unsigned char *strtext, size_t *retbuflen)
{
size_t buflen;
unsigned char *buffer,
*sp,
*bp;
unsigned int state = 0;
if (strtext == NULL)
return NULL;
buflen = strlen(strtext); /* will shrink, also we discover if
* strtext */
buffer = (unsigned char *) emalloc(buflen); /* isn't NULL terminated */
for (bp = buffer, sp = strtext; *sp != '\0'; bp++, sp++)
{
switch (state)
{
case 0:
if (*sp == '\\')
state = 1;
*bp = *sp;
break;
case 1:
if (*sp == '\'') /* state=5 */
{ /* replace \' with 39 */
bp--;
*bp = '\'';
buflen--;
state = 0;
}
else if (*sp == '\\') /* state=6 */
{ /* replace \\ with 92 */
bp--;
*bp = '\\';
buflen--;
state = 0;
}
else
{
if (isdigit(*sp))
state = 2;
else
state = 0;
*bp = *sp;
}
break;
case 2:
if (isdigit(*sp))
state = 3;
else
state = 0;
*bp = *sp;
break;
case 3:
if (isdigit(*sp)) /* state=4 */
{
unsigned char *start, *end, buf[4]; /* 000 + '\0' */
bp -= 3;
memcpy(buf, sp-2, 3);
buf[3] = '\0';
start = buf;
*bp = (unsigned char)strtoul(start, (char **)&end, 8);
buflen -= 3;
state = 0;
}
else
{
*bp = *sp;
state = 0;
}
break;
}
}
buffer = erealloc(buffer, buflen+1);
buffer[buflen] = '\0';
*retbuflen = buflen;
return buffer;
}
static int pgsql_stmt_get_col(pdo_stmt_t *stmt, int colno, char **ptr, unsigned long *len, int *caller_frees TSRMLS_DC)
{
pdo_pgsql_stmt *S = (pdo_pgsql_stmt*)stmt->driver_data;
struct pdo_column_data *cols = stmt->columns;
size_t tmp_len;
if (!S->result) {
return 0;
}
/* We have already increased count by 1 in pgsql_stmt_fetch() */
if (PQgetisnull(S->result, S->current_row - 1, colno)) { /* Check if we got NULL */
*ptr = NULL;
*len = 0;
} else {
*ptr = PQgetvalue(S->result, S->current_row - 1, colno);
*len = PQgetlength(S->result, S->current_row - 1, colno);
switch(cols[colno].param_type) {
case PDO_PARAM_INT:
S->cols[colno].intval = atol(*ptr);
*ptr = (char *) &(S->cols[colno].intval);
*len = sizeof(long);
break;
case PDO_PARAM_BOOL:
S->cols[colno].boolval = **ptr == 't' ? 1: 0;
*ptr = (char *) &(S->cols[colno].boolval);
*len = sizeof(zend_bool);
break;
case PDO_PARAM_LOB:
if (S->cols[colno].pgsql_type == OIDOID) {
/* ooo, a real large object */
char *end_ptr;
Oid oid = (Oid)strtoul(*ptr, &end_ptr, 10);
int loid = lo_open(S->H->server, oid, INV_READ);
if (loid >= 0) {
*ptr = (char*)pdo_pgsql_create_lob_stream(stmt->dbh, loid, oid TSRMLS_CC);
*len = 0;
return *ptr ? 1 : 0;
}
*ptr = NULL;
*len = 0;
return 0;
} else {
*ptr = php_pdo_pgsql_unescape_bytea(*ptr, &tmp_len);
*len = tmp_len;
*caller_frees = 1;
}
break;
case PDO_PARAM_NULL:
case PDO_PARAM_STR:
case PDO_PARAM_STMT:
case PDO_PARAM_INPUT_OUTPUT:
break;
}
}
return 1;
}
static int pgsql_stmt_get_column_meta(pdo_stmt_t *stmt, long colno, zval *return_value TSRMLS_DC)
{
pdo_pgsql_stmt *S = (pdo_pgsql_stmt*)stmt->driver_data;
PGresult *res;
char *q=NULL;
ExecStatusType status;
if (!S->result) {
return FAILURE;
}
if (colno >= stmt->column_count) {
return FAILURE;
}
array_init(return_value);
add_assoc_long(return_value, "pgsql:oid", S->cols[colno].pgsql_type);
/* Fetch metadata from Postgres system catalogue */
spprintf(&q, 0, "SELECT TYPNAME FROM PG_TYPE WHERE OID=%d", S->cols[colno].pgsql_type);
res = PQexec(S->H->server, q);
efree(q);
status = PQresultStatus(res);
if (status != PGRES_TUPLES_OK) {
/* Failed to get system catalogue, but return success
* with the data we have collected so far
*/
PQclear(res);
return 1;
}
/* We want exactly one row returned */
if (1 != PQntuples(res)) {
PQclear(res);
return 1;
}
add_assoc_string(return_value, "native_type", PQgetvalue(res, 0, 0), 1);
PQclear(res);
return 1;
}
static int pdo_pgsql_stmt_cursor_closer(pdo_stmt_t *stmt TSRMLS_DC)
{
return 1;
}
struct pdo_stmt_methods pgsql_stmt_methods = {
pgsql_stmt_dtor,
pgsql_stmt_execute,
pgsql_stmt_fetch,
pgsql_stmt_describe,
pgsql_stmt_get_col,
pgsql_stmt_param_hook,
NULL, /* set_attr */
NULL, /* get_attr */
pgsql_stmt_get_column_meta,
NULL, /* next_rowset */
pdo_pgsql_stmt_cursor_closer
};
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
* vim600: noet sw=4 ts=4 fdm=marker
* vim<600: noet sw=4 ts=4
*/
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