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freeswitch/libs/apr-util/dbd/apr_dbd_sqlite3.c
Michael Jerris 3b35430557 add apr-util 1.2.8 to in tree libs 
git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@3734 d0543943-73ff-0310-b7d9-9358b9ac24b2
2006-12-19 20:04:21 +00:00

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/* Copyright 2000-2005 The Apache Software Foundation or its licensors, as
* applicable.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "apu.h"
#if APU_HAVE_SQLITE3
#include <ctype.h>
#include <stdlib.h>
#include <sqlite3.h>
#include "apr_strings.h"
#include "apr_time.h"
#include "apr_dbd_internal.h"
#define MAX_RETRY_COUNT 15
#define MAX_RETRY_SLEEP 100000
struct apr_dbd_transaction_t {
int errnum;
apr_dbd_t *handle;
};
struct apr_dbd_t {
sqlite3 *conn;
apr_dbd_transaction_t *trans;
#if APR_HAS_THREADS
apr_thread_mutex_t *mutex;
#endif
apr_pool_t *pool;
apr_dbd_prepared_t *prep;
};
typedef struct {
char *name;
char *value;
int size;
int type;
} apr_dbd_column_t;
struct apr_dbd_row_t {
apr_dbd_results_t *res;
apr_dbd_column_t **columns;
apr_dbd_row_t *next_row;
int columnCount;
int rownum;
};
struct apr_dbd_results_t {
int random;
sqlite3 *handle;
sqlite3_stmt *stmt;
apr_dbd_row_t *next_row;
size_t sz;
int tuples;
char **col_names;
};
struct apr_dbd_prepared_t {
sqlite3_stmt *stmt;
apr_dbd_prepared_t *next;
};
#define dbd_sqlite3_is_success(x) (((x) == SQLITE_DONE ) \
|| ((x) == SQLITE_OK ))
static int dbd_sqlite3_select(apr_pool_t * pool, apr_dbd_t * sql, apr_dbd_results_t ** results, const char *query, int seek)
{
sqlite3_stmt *stmt = NULL;
const char *tail = NULL;
int i, ret, retry_count = 0;
size_t num_tuples = 0;
int increment = 0;
apr_dbd_row_t *row = NULL;
apr_dbd_row_t *lastrow = NULL;
apr_dbd_column_t *column;
char *hold = NULL;
if (sql->trans && sql->trans->errnum) {
return sql->trans->errnum;
}
#if APR_HAS_THREADS
apr_thread_mutex_lock(sql->mutex);
#endif
ret = sqlite3_prepare(sql->conn, query, strlen(query), &stmt, &tail);
if (!dbd_sqlite3_is_success(ret)) {
#if APR_HAS_THREADS
apr_thread_mutex_unlock(sql->mutex);
#endif
return ret;
} else {
int column_count;
column_count = sqlite3_column_count(stmt);
if (!*results) {
*results = apr_pcalloc(pool, sizeof(apr_dbd_results_t));
}
(*results)->stmt = stmt;
(*results)->sz = column_count;
(*results)->random = seek;
(*results)->next_row = 0;
(*results)->tuples = 0;
(*results)->col_names = apr_pcalloc(pool,
column_count * sizeof(char *));
do {
ret = sqlite3_step(stmt);
if (ret == SQLITE_BUSY) {
if (retry_count++ > MAX_RETRY_COUNT) {
ret = SQLITE_ERROR;
} else {
#if APR_HAS_THREADS
apr_thread_mutex_unlock(sql->mutex);
#endif
apr_sleep(MAX_RETRY_SLEEP);
#if APR_HAS_THREADS
apr_thread_mutex_lock(sql->mutex);
#endif
}
} else if (ret == SQLITE_ROW) {
int length;
apr_dbd_column_t *col;
row = apr_palloc(pool, sizeof(apr_dbd_row_t));
row->res = *results;
increment = sizeof(apr_dbd_column_t *);
length = increment * (*results)->sz;
row->columns = apr_palloc(pool, length);
row->columnCount = column_count;
for (i = 0; i < (*results)->sz; i++) {
column = apr_palloc(pool, sizeof(apr_dbd_column_t));
row->columns[i] = column;
/* copy column name once only */
if ((*results)->col_names[i] == NULL) {
(*results)->col_names[i] =
apr_pstrdup(pool, sqlite3_column_name(stmt, i));
}
column->name = (*results)->col_names[i];
column->size = sqlite3_column_bytes(stmt, i);
column->type = sqlite3_column_type(stmt, i);
column->value = NULL;
switch (column->type) {
case SQLITE_FLOAT:
case SQLITE_INTEGER:
case SQLITE_TEXT:
hold = NULL;
hold = (char *) sqlite3_column_text(stmt, i);
if (hold) {
column->value = apr_palloc(pool, column->size + 1);
strncpy(column->value, hold, column->size + 1);
}
break;
case SQLITE_BLOB:
break;
case SQLITE_NULL:
break;
}
col = row->columns[i];
}
row->rownum = num_tuples++;
row->next_row = 0;
(*results)->tuples = num_tuples;
if ((*results)->next_row == 0) {
(*results)->next_row = row;
}
if (lastrow != 0) {
lastrow->next_row = row;
}
lastrow = row;
} else if (ret == SQLITE_DONE) {
ret = SQLITE_OK;
}
} while (ret == SQLITE_ROW || ret == SQLITE_BUSY);
}
ret = sqlite3_finalize(stmt);
#if APR_HAS_THREADS
apr_thread_mutex_unlock(sql->mutex);
#endif
if (sql->trans) {
sql->trans->errnum = ret;
}
return ret;
}
static int dbd_sqlite3_get_row(apr_pool_t *pool, apr_dbd_results_t *res,
apr_dbd_row_t **rowp, int rownum)
{
int i = 0;
if (rownum == -1) {
*rowp = res->next_row;
if (*rowp == 0)
return -1;
res->next_row = (*rowp)->next_row;
return 0;
}
if (rownum > res->tuples) {
return -1;
}
rownum--;
*rowp = res->next_row;
for (; *rowp != 0; i++, *rowp = (*rowp)->next_row) {
if (i == rownum) {
return 0;
}
}
return -1;
}
static const char *dbd_sqlite3_get_entry(const apr_dbd_row_t *row, int n)
{
apr_dbd_column_t *column;
const char *value;
if ((n < 0) || (n >= row->columnCount)) {
return NULL;
}
column = row->columns[n];
value = column->value;
return value;
}
static const char *dbd_sqlite3_error(apr_dbd_t *sql, int n)
{
return sqlite3_errmsg(sql->conn);
}
static int dbd_sqlite3_query(apr_dbd_t *sql, int *nrows, const char *query)
{
sqlite3_stmt *stmt = NULL;
const char *tail = NULL;
int ret = -1, length = 0;
if (sql->trans && sql->trans->errnum) {
return sql->trans->errnum;
}
length = strlen(query);
#if APR_HAS_THREADS
apr_thread_mutex_lock(sql->mutex);
#endif
do {
int retry_count = 0;
ret = sqlite3_prepare(sql->conn, query, length, &stmt, &tail);
if (ret != SQLITE_OK) {
sqlite3_finalize(stmt);
break;
}
while(retry_count++ <= MAX_RETRY_COUNT) {
ret = sqlite3_step(stmt);
if (ret != SQLITE_BUSY)
break;
#if APR_HAS_THREADS
apr_thread_mutex_unlock(sql->mutex);
#endif
apr_sleep(MAX_RETRY_SLEEP);
#if APR_HAS_THREADS
apr_thread_mutex_lock(sql->mutex);
#endif
}
*nrows = sqlite3_changes(sql->conn);
sqlite3_finalize(stmt);
length -= (tail - query);
query = tail;
} while (length > 0);
if (dbd_sqlite3_is_success(ret)) {
ret = 0;
}
#if APR_HAS_THREADS
apr_thread_mutex_unlock(sql->mutex);
#endif
if (sql->trans) {
sql->trans->errnum = ret;
}
return ret;
}
static apr_status_t free_mem(void *data)
{
sqlite3_free(data);
return APR_SUCCESS;
}
static const char *dbd_sqlite3_escape(apr_pool_t *pool, const char *arg,
apr_dbd_t *sql)
{
char *ret = sqlite3_mprintf("%q", arg);
apr_pool_cleanup_register(pool, ret, free_mem,
apr_pool_cleanup_null);
return ret;
}
static int dbd_sqlite3_prepare(apr_pool_t *pool, apr_dbd_t *sql,
const char *query, const char *label,
apr_dbd_prepared_t **statement)
{
sqlite3_stmt *stmt;
char *p, *slquery = apr_pstrdup(pool, query);
const char *tail = NULL, *q;
int ret;
for (p = slquery, q = query; *q; ++q) {
if (q[0] == '%') {
if (isalpha(q[1])) {
*p++ = '?';
++q;
}
else if (q[1] == '%') {
/* reduce %% to % */
*p++ = *q++;
}
else {
*p++ = *q;
}
}
else {
*p++ = *q;
}
}
*p = 0;
#if APR_HAS_THREADS
apr_thread_mutex_lock(sql->mutex);
#endif
ret = sqlite3_prepare(sql->conn, slquery, strlen(query), &stmt, &tail);
if (ret == SQLITE_OK) {
apr_dbd_prepared_t *prep;
prep = apr_pcalloc(sql->pool, sizeof(*prep));
prep->stmt = stmt;
prep->next = sql->prep;
/* link new statement to the handle */
sql->prep = prep;
*statement = prep;
} else {
sqlite3_finalize(stmt);
}
#if APR_HAS_THREADS
apr_thread_mutex_unlock(sql->mutex);
#endif
return ret;
}
static int dbd_sqlite3_pquery(apr_pool_t *pool, apr_dbd_t *sql,
int *nrows, apr_dbd_prepared_t *statement,
int nargs, const char **values)
{
sqlite3_stmt *stmt = statement->stmt;
int ret = -1, retry_count = 0, i;
if (sql->trans && sql->trans->errnum) {
return sql->trans->errnum;
}
#if APR_HAS_THREADS
apr_thread_mutex_lock(sql->mutex);
#endif
ret = sqlite3_reset(stmt);
if (ret == SQLITE_OK) {
for (i=0; i < nargs; i++) {
sqlite3_bind_text(stmt, i + 1, values[i], strlen(values[i]),
SQLITE_STATIC);
}
while(retry_count++ <= MAX_RETRY_COUNT) {
ret = sqlite3_step(stmt);
if (ret != SQLITE_BUSY)
break;
#if APR_HAS_THREADS
apr_thread_mutex_unlock(sql->mutex);
#endif
apr_sleep(MAX_RETRY_SLEEP);
#if APR_HAS_THREADS
apr_thread_mutex_lock(sql->mutex);
#endif
}
*nrows = sqlite3_changes(sql->conn);
sqlite3_reset(stmt);
}
if (dbd_sqlite3_is_success(ret)) {
ret = 0;
}
#if APR_HAS_THREADS
apr_thread_mutex_unlock(sql->mutex);
#endif
if (sql->trans) {
sql->trans->errnum = ret;
}
return ret;
}
static int dbd_sqlite3_pvquery(apr_pool_t *pool, apr_dbd_t *sql, int *nrows,
apr_dbd_prepared_t *statement, va_list args)
{
const char **values;
int i, nargs;
if (sql->trans && sql->trans->errnum) {
return sql->trans->errnum;
}
nargs = sqlite3_bind_parameter_count(statement->stmt);
values = apr_palloc(pool, sizeof(*values) * nargs);
for (i = 0; i < nargs; i++) {
values[i] = apr_pstrdup(pool, va_arg(args, const char*));
}
return dbd_sqlite3_pquery(pool, sql, nrows, statement, nargs, values);
}
static int dbd_sqlite3_pselect(apr_pool_t *pool, apr_dbd_t *sql,
apr_dbd_results_t **results,
apr_dbd_prepared_t *statement, int seek,
int nargs, const char **values)
{
sqlite3_stmt *stmt = statement->stmt;
int i, ret, retry_count = 0;
size_t num_tuples = 0;
int increment = 0;
apr_dbd_row_t *row = NULL;
apr_dbd_row_t *lastrow = NULL;
apr_dbd_column_t *column;
char *hold = NULL;
if (sql->trans && sql->trans->errnum) {
return sql->trans->errnum;
}
#if APR_HAS_THREADS
apr_thread_mutex_lock(sql->mutex);
#endif
ret = sqlite3_reset(stmt);
if (ret == SQLITE_OK) {
int column_count;
for (i=0; i < nargs; i++) {
sqlite3_bind_text(stmt, i + 1, values[i], strlen(values[i]),
SQLITE_STATIC);
}
column_count = sqlite3_column_count(stmt);
if (!*results) {
*results = apr_pcalloc(pool, sizeof(apr_dbd_results_t));
}
(*results)->stmt = stmt;
(*results)->sz = column_count;
(*results)->random = seek;
(*results)->next_row = 0;
(*results)->tuples = 0;
(*results)->col_names = apr_pcalloc(pool,
column_count * sizeof(char *));
do {
ret = sqlite3_step(stmt);
if (ret == SQLITE_BUSY) {
if (retry_count++ > MAX_RETRY_COUNT) {
ret = SQLITE_ERROR;
} else {
#if APR_HAS_THREADS
apr_thread_mutex_unlock(sql->mutex);
#endif
apr_sleep(MAX_RETRY_SLEEP);
#if APR_HAS_THREADS
apr_thread_mutex_lock(sql->mutex);
#endif
}
} else if (ret == SQLITE_ROW) {
int length;
apr_dbd_column_t *col;
row = apr_palloc(pool, sizeof(apr_dbd_row_t));
row->res = *results;
increment = sizeof(apr_dbd_column_t *);
length = increment * (*results)->sz;
row->columns = apr_palloc(pool, length);
row->columnCount = column_count;
for (i = 0; i < (*results)->sz; i++) {
column = apr_palloc(pool, sizeof(apr_dbd_column_t));
row->columns[i] = column;
/* copy column name once only */
if ((*results)->col_names[i] == NULL) {
(*results)->col_names[i] =
apr_pstrdup(pool, sqlite3_column_name(stmt, i));
}
column->name = (*results)->col_names[i];
column->size = sqlite3_column_bytes(stmt, i);
column->type = sqlite3_column_type(stmt, i);
column->value = NULL;
switch (column->type) {
case SQLITE_FLOAT:
case SQLITE_INTEGER:
case SQLITE_TEXT:
hold = NULL;
hold = (char *) sqlite3_column_text(stmt, i);
if (hold) {
column->value = apr_palloc(pool, column->size + 1);
strncpy(column->value, hold, column->size + 1);
}
break;
case SQLITE_BLOB:
break;
case SQLITE_NULL:
break;
}
col = row->columns[i];
}
row->rownum = num_tuples++;
row->next_row = 0;
(*results)->tuples = num_tuples;
if ((*results)->next_row == 0) {
(*results)->next_row = row;
}
if (lastrow != 0) {
lastrow->next_row = row;
}
lastrow = row;
} else if (ret == SQLITE_DONE) {
ret = SQLITE_OK;
}
} while (ret == SQLITE_ROW || ret == SQLITE_BUSY);
sqlite3_reset(stmt);
}
#if APR_HAS_THREADS
apr_thread_mutex_unlock(sql->mutex);
#endif
if (sql->trans) {
sql->trans->errnum = ret;
}
return ret;
}
static int dbd_sqlite3_pvselect(apr_pool_t *pool, apr_dbd_t *sql,
apr_dbd_results_t **results,
apr_dbd_prepared_t *statement, int seek,
va_list args)
{
const char **values;
int i, nargs;
if (sql->trans && sql->trans->errnum) {
return sql->trans->errnum;
}
nargs = sqlite3_bind_parameter_count(statement->stmt);
values = apr_palloc(pool, sizeof(*values) * nargs);
for (i = 0; i < nargs; i++) {
values[i] = apr_pstrdup(pool, va_arg(args, const char*));
}
return dbd_sqlite3_pselect(pool, sql, results, statement,
seek, nargs, values);
}
static int dbd_sqlite3_start_transaction(apr_pool_t *pool,
apr_dbd_t *handle,
apr_dbd_transaction_t **trans)
{
int ret = 0;
int nrows = 0;
ret = dbd_sqlite3_query(handle, &nrows, "BEGIN");
if (!*trans) {
*trans = apr_pcalloc(pool, sizeof(apr_dbd_transaction_t));
(*trans)->handle = handle;
handle->trans = *trans;
}
return ret;
}
static int dbd_sqlite3_end_transaction(apr_dbd_transaction_t *trans)
{
int ret = -1; /* ending transaction that was never started is an error */
int nrows = 0;
if (trans) {
if (trans->errnum) {
trans->errnum = 0;
ret = dbd_sqlite3_query(trans->handle, &nrows, "ROLLBACK");
} else {
ret = dbd_sqlite3_query(trans->handle, &nrows, "COMMIT");
}
trans->handle->trans = NULL;
}
return ret;
}
static apr_dbd_t *dbd_sqlite3_open(apr_pool_t *pool, const char *params)
{
apr_dbd_t *sql = NULL;
sqlite3 *conn = NULL;
apr_status_t res;
int sqlres;
if (!params)
return NULL;
sqlres = sqlite3_open(params, &conn);
if (sqlres != SQLITE_OK) {
sqlite3_close(conn);
return NULL;
}
/* should we register rand or power functions to the sqlite VM? */
sql = apr_pcalloc(pool, sizeof(*sql));
sql->conn = conn;
sql->pool = pool;
sql->trans = NULL;
#if APR_HAS_THREADS
/* Create a mutex */
res = apr_thread_mutex_create(&sql->mutex, APR_THREAD_MUTEX_DEFAULT,
pool);
if (res != APR_SUCCESS) {
return NULL;
}
#endif
return sql;
}
static apr_status_t dbd_sqlite3_close(apr_dbd_t *handle)
{
apr_dbd_prepared_t *prep = handle->prep;
/* finalize all prepared statements, or we'll get SQLITE_BUSY on close */
while (prep) {
sqlite3_finalize(prep->stmt);
prep = prep->next;
}
sqlite3_close(handle->conn);
#if APR_HAS_THREADS
apr_thread_mutex_destroy(handle->mutex);
#endif
return APR_SUCCESS;
}
static apr_status_t dbd_sqlite3_check_conn(apr_pool_t *pool,
apr_dbd_t *handle)
{
return (handle->conn != NULL) ? APR_SUCCESS : APR_EGENERAL;
}
static int dbd_sqlite3_select_db(apr_pool_t *pool, apr_dbd_t *handle,
const char *name)
{
return APR_ENOTIMPL;
}
static void *dbd_sqlite3_native(apr_dbd_t *handle)
{
return handle->conn;
}
static int dbd_sqlite3_num_cols(apr_dbd_results_t *res)
{
return res->sz;
}
static int dbd_sqlite3_num_tuples(apr_dbd_results_t *res)
{
return res->tuples;
}
APU_DECLARE_DATA const apr_dbd_driver_t apr_dbd_sqlite3_driver = {
"sqlite3",
NULL,
dbd_sqlite3_native,
dbd_sqlite3_open,
dbd_sqlite3_check_conn,
dbd_sqlite3_close,
dbd_sqlite3_select_db,
dbd_sqlite3_start_transaction,
dbd_sqlite3_end_transaction,
dbd_sqlite3_query,
dbd_sqlite3_select,
dbd_sqlite3_num_cols,
dbd_sqlite3_num_tuples,
dbd_sqlite3_get_row,
dbd_sqlite3_get_entry,
dbd_sqlite3_error,
dbd_sqlite3_escape,
dbd_sqlite3_prepare,
dbd_sqlite3_pvquery,
dbd_sqlite3_pvselect,
dbd_sqlite3_pquery,
dbd_sqlite3_pselect,
};
#endif
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