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libs-sqlclient/SQLClient.m
Richard Frith-MacDonald 073f4242f1 small thread safety fix 
git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/sqlclient/trunk@23449 72102866-910b-0410-8b05-ffd578937521
2006-09-10 13:37:23 +00:00

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/* -*-objc-*- */
/** Implementation of SQLClient for GNUStep
Copyright (C) 2004 Free Software Foundation, Inc.
Written by: Richard Frith-Macdonald <rfm@gnu.org>
Date: April 2004
This file is part of the SQLClient Library.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111 USA.
$Date$ $Revision$
*/
#include <Foundation/NSArray.h>
#include <Foundation/NSString.h>
#include <Foundation/NSData.h>
#include <Foundation/NSDate.h>
#include <Foundation/NSCalendarDate.h>
#include <Foundation/NSCharacterSet.h>
#include <Foundation/NSException.h>
#include <Foundation/NSProcessInfo.h>
#include <Foundation/NSNotification.h>
#include <Foundation/NSUserDefaults.h>
#include <Foundation/NSHashTable.h>
#include <Foundation/NSMapTable.h>
#include <Foundation/NSBundle.h>
#include <Foundation/NSLock.h>
#include <Foundation/NSAutoreleasePool.h>
#include <Foundation/NSValue.h>
#include <Foundation/NSNull.h>
#include <Foundation/NSDebug.h>
#include <Foundation/NSPathUtilities.h>
#include <Foundation/NSSet.h>
#include <Foundation/NSTimer.h>
#include <GNUstepBase/GSLock.h>
#include <Performance/GSCache.h>
#include <Performance/GSTicker.h>
#include "SQLClient.h"
static NSNull *null = nil;
static Class NSStringClass = 0;
static Class NSArrayClass = 0;
static Class NSDateClass = 0;
static Class NSSetClass = 0;
@interface SQLClientPool : NSObject
{
unsigned pool;
NSString *name;
NSString *serv;
NSString *user;
NSString *pass;
NSString *path;
NSHashTable *idle;
NSHashTable *used;
}
- (BOOL) isSingle;
- (BOOL) makeIdle: (SQLClient*)c;
- (BOOL) makeUsed: (SQLClient*)c;
- (void) setConfiguration: (NSDictionary*)o;
@end
@implementation SQLClientPool
- (void) dealloc
{
if (idle != 0)
{
NSFreeHashTable(idle);
idle = 0;
}
if (used != 0)
{
NSFreeHashTable(used);
used = 0;
}
DESTROY(name);
DESTROY(serv);
DESTROY(user);
DESTROY(pass);
DESTROY(path);
[super dealloc];
}
- (id) initWithConfiguration: (NSDictionary*)config
name: (NSString*)reference
{
name = [reference copy];
idle = NSCreateHashTable(NSNonRetainedObjectHashCallBacks, 16);
used = NSCreateHashTable(NSNonRetainedObjectHashCallBacks, 16);
[self setConfiguration: config];
return self;
}
- (BOOL) isSingle
{
if (pool == 1)
{
return YES;
}
return NO;
}
- (BOOL) makeIdle: (SQLClient*)c
{
if (NSHashGet(idle, (void*)c) == (void*)c)
{
return YES; // Already idle
}
if (NSHashGet(used, (void*)c) == (void*)c)
{
NSHashRemove(used, (void*)c);
}
if (NSCountHashTable(idle) + NSCountHashTable(used) < pool)
{
NSHashInsert(idle, (void*)c);
return YES;
}
return NO;
}
- (BOOL) makeUsed: (SQLClient*)c
{
if (NSHashGet(used, (void*)c) == (void*)c)
{
return YES; // Already used
}
if (NSHashGet(idle, (void*)c) == (void*)c)
{
NSHashRemove(idle, (void*)c);
}
if (NSCountHashTable(idle) + NSCountHashTable(used) < pool)
{
NSHashInsert(used, (void*)c);
return YES;
}
return NO;
}
- (void) setConfiguration: (NSDictionary*)o
{
NSDictionary *d;
NSString *s;
BOOL change = NO;
int capacity;
/*
* get dictionary containing config info for this client by name.
*/
d = [o objectForKey: @"SQLClientReferences"];
if ([d isKindOfClass: [NSDictionary class]] == NO)
{
d = nil;
}
d = [d objectForKey: name];
if ([d isKindOfClass: [NSDictionary class]] == NO)
{
d = nil;
}
s = [d objectForKey: @"ServerType"];
if ([s isKindOfClass: NSStringClass] == NO)
{
s = @"Postgres";
}
if (s != serv && [s isEqual: serv] == NO)
{
ASSIGNCOPY(serv, s);
change = YES;
}
s = [d objectForKey: @"Database"];
if ([s isKindOfClass: NSStringClass] == NO)
{
s = [o objectForKey: @"Database"];
if ([s isKindOfClass: NSStringClass] == NO)
{
s = nil;
}
}
if (s != path && [s isEqual: path] == NO)
{
ASSIGNCOPY(path, s);
change = YES;
}
s = [d objectForKey: @"User"];
if ([s isKindOfClass: NSStringClass] == NO)
{
s = [o objectForKey: @"User"];
if ([s isKindOfClass: NSStringClass] == NO)
{
s = @"";
}
}
if (s != user && [s isEqual: user] == NO)
{
ASSIGNCOPY(user, s);
change = YES;
}
s = [d objectForKey: @"Password"];
if ([s isKindOfClass: NSStringClass] == NO)
{
s = [o objectForKey: @"Password"];
if ([s isKindOfClass: NSStringClass] == NO)
{
s = @"";
}
}
if (s != pass && [s isEqual: pass] == NO)
{
ASSIGNCOPY(pass, s);
change = YES;
}
s = [d objectForKey: @"Password"];
if ([s isKindOfClass: NSStringClass] == NO)
{
s = @"1";
}
capacity = [s intValue];
if (capacity < 1) capacity = 1;
if (capacity > 100) capacity = 100;
if (change == YES)
{
NSResetHashTable(idle);
NSResetHashTable(used);
}
if (pool > capacity)
{
unsigned ic = NSCountHashTable(idle);
unsigned uc = NSCountHashTable(used);
if (ic + uc > capacity)
{
NSHashEnumerator e = NSEnumerateHashTable(idle);
void *c;
while (ic + uc > capacity
&& (c = NSNextHashEnumeratorItem(&e)) != nil)
{
NSHashRemove(idle, c);
ic--;
}
NSEndHashTableEnumeration(&e);
if (uc > capacity)
{
NSHashEnumerator e = NSEnumerateHashTable(used);
void *c;
while (uc > capacity
&& (c = NSNextHashEnumeratorItem(&e)) != nil)
{
NSHashRemove(used, c);
uc--;
}
NSEndHashTableEnumeration(&e);
}
}
}
pool = capacity;
}
@end
typedef struct {
@defs(SQLTransaction);
} *TDefs;
@implementation SQLRecord
+ (id) allocWithZone: (NSZone*)aZone
{
NSLog(@"Illegal attempt to allocate an SQLRecord");
return nil;
}
+ (void) initialize
{
GSTickerTimeNow();
if (null == nil)
{
null = [NSNull new];
}
}
+ (id) newWithValues: (id*)v keys: (NSString**)k count: (unsigned int)c
{
id *ptr;
SQLRecord *r;
unsigned pos;
r = (SQLRecord*)NSAllocateObject(self, c*2*sizeof(id), NSDefaultMallocZone());
r->count = c;
ptr = ((void*)&(r->count)) + sizeof(r->count);
for (pos = 0; pos < c; pos++)
{
if (v[pos] == nil)
{
ptr[pos] = RETAIN(null);
}
else
{
ptr[pos] = RETAIN(v[pos]);
}
ptr[pos + c] = RETAIN(k[pos]);
}
return r;
}
- (NSArray*) allKeys
{
id *ptr;
ptr = ((void*)&count) + sizeof(count);
return [NSArray arrayWithObjects: &ptr[count] count: count];
}
- (id) copyWithZone: (NSZone*)z
{
return RETAIN(self);
}
- (unsigned int) count
{
return count;
}
- (void) dealloc
{
id *ptr;
unsigned pos;
ptr = ((void*)&count) + sizeof(count);
for (pos = 0; pos < count; pos++)
{
DESTROY(ptr[pos]);
DESTROY(ptr[count + pos]);
}
[super dealloc];
}
- (NSMutableDictionary*) dictionary
{
NSMutableDictionary *d;
unsigned pos;
id *ptr;
ptr = ((void*)&count) + sizeof(count);
d = [NSMutableDictionary dictionaryWithCapacity: count];
for (pos = 0; pos < count; pos++)
{
[d setObject: ptr[pos] forKey: [ptr[pos + count] lowercaseString]];
}
return d;
}
- (void) getObjects: (id*)buf
{
id *ptr;
unsigned pos;
ptr = ((void*)&count) + sizeof(count);
for (pos = 0; pos < count; pos++)
{
buf[pos] = ptr[pos];
}
}
- (id) init
{
NSLog(@"Illegal attempt to -init an SQLRecord");
DESTROY(self);
return self;
}
- (id) objectAtIndex: (unsigned int)pos
{
id *ptr;
if (pos >= count)
{
[NSException raise: NSRangeException
format: @"Array index too large"];
}
ptr = ((void*)&count) + sizeof(count);
return ptr[pos];
}
- (id) objectForKey: (NSString*)key
{
id *ptr;
unsigned int pos;
ptr = ((void*)&count) + sizeof(count);
for (pos = 0; pos < count; pos++)
{
if ([key isEqualToString: ptr[pos + count]] == YES)
{
return ptr[pos];
}
}
for (pos = 0; pos < count; pos++)
{
if ([key caseInsensitiveCompare: ptr[pos + count]] == NSOrderedSame)
{
return ptr[pos];
}
}
return nil;
}
- (void) setObject: (id)anObject forKey: (NSString*)aKey
{
id *ptr;
unsigned int pos;
if (anObject == nil)
{
anObject = null;
}
ptr = ((void*)&count) + sizeof(count);
for (pos = 0; pos < count; pos++)
{
if ([aKey isEqualToString: ptr[pos + count]] == YES)
{
ASSIGN(ptr[pos], anObject);
return;
}
}
for (pos = 0; pos < count; pos++)
{
if ([aKey caseInsensitiveCompare: ptr[pos + count]] == NSOrderedSame)
{
ASSIGN(ptr[pos], anObject);
return;
}
}
[NSException raise: NSInvalidArgumentException
format: @"Bad key (%@) in -setObject:forKey:", aKey];
}
- (unsigned) sizeInBytes: (NSMutableSet*)exclude
{
if ([exclude member: self] != nil)
{
return 0;
}
else
{
unsigned size = [super sizeInBytes: exclude];
unsigned pos;
id *ptr;
ptr = ((void*)&count) + sizeof(count);
for (pos = 0; pos < count; pos++)
{
size += [ptr[pos] sizeInBytes: exclude];
}
return size;
}
}
@end
/**
* Exception raised when an error with the remote database server occurs.
*/
NSString *SQLException = @"SQLException";
/**
* Exception for when a connection to the server is lost.
*/
NSString *SQLConnectionException = @"SQLConnectionException";
/**
* Exception for when a query is supposed to return data and doesn't.
*/
NSString *SQLEmptyException = @"SQLEmptyException";
/**
* Exception for when an insert/update would break the uniqueness of a
* field or index.
*/
NSString *SQLUniqueException = @"SQLUniqueException";
@implementation SQLClient (Logging)
static unsigned int classDebugging = 0;
static NSTimeInterval classDuration = -1;
+ (unsigned int) debugging
{
return classDebugging;
}
+ (NSTimeInterval) durationLogging
{
return classDuration;
}
+ (void) setDebugging: (unsigned int)level
{
classDebugging = level;
}
+ (void) setDurationLogging: (NSTimeInterval)threshold
{
classDuration = threshold;
}
- (void) debug: (NSString*)fmt, ...
{
va_list ap;
va_start(ap, fmt);
NSLogv(fmt, ap);
va_end(ap);
}
- (unsigned int) debugging
{
return _debugging;
}
- (NSTimeInterval) durationLogging
{
return _duration;
}
- (void) setDebugging: (unsigned int)level
{
_debugging = level;
}
- (void) setDurationLogging: (NSTimeInterval)threshold
{
_duration = threshold;
}
@end
/**
* Container for all instances.
*/
static NSMapTable *clientsMap = 0;
static NSRecursiveLock *clientsMapLock = nil;
static NSString *beginString = @"begin";
static NSArray *beginStatement = nil;
static NSString *commitString = @"commit";
static NSArray *commitStatement = nil;
static NSString *rollbackString = @"rollback";
static NSArray *rollbackStatement = nil;
@interface SQLClient (Private)
- (void) _configure: (NSNotification*)n;
- (NSArray*) _prepare: (NSString*)stmt args: (va_list)args;
- (NSArray*) _substitute: (NSString*)str with: (NSDictionary*)vals;
+ (void) _tick: (NSTimer*)t;
@end
@implementation SQLClient
static unsigned int maxConnections = 8;
+ (NSArray*) allClients
{
NSArray *a;
[clientsMapLock lock];
a = NSAllMapTableValues(clientsMap);
[clientsMapLock unlock];
return a;
}
+ (SQLClient*) clientWithConfiguration: (NSDictionary*)config
name: (NSString*)reference
{
SQLClient *o;
if ([reference isKindOfClass: NSStringClass] == NO)
{
if (config == nil)
{
reference = [[NSUserDefaults standardUserDefaults] objectForKey:
@"SQLClientName"];
}
else
{
reference = [config objectForKey: @"SQLClientName"];
}
if ([reference isKindOfClass: NSStringClass] == NO)
{
reference = @"Database";
}
}
o = [self existingClient: reference];
if (o == nil)
{
o = [[SQLClient alloc] initWithConfiguration: config name: reference];
AUTORELEASE(o);
}
return o;
}
+ (SQLClient*) existingClient: (NSString*)reference
{
SQLClient *existing;
if ([reference isKindOfClass: NSStringClass] == NO)
{
reference = [[NSUserDefaults standardUserDefaults] stringForKey:
@"SQLClientName"];
if (reference == nil)
{
reference = @"Database";
}
}
[clientsMapLock lock];
existing = (SQLClient*)NSMapGet(clientsMap, reference);
AUTORELEASE(RETAIN(existing));
[clientsMapLock unlock];
return existing;
}
+ (void) initialize
{
GSTickerTimeNow();
if (null == nil)
{
null = [NSNull new];
}
if (clientsMap == 0)
{
clientsMap = NSCreateMapTable(NSObjectMapKeyCallBacks,
NSNonRetainedObjectMapValueCallBacks, 0);
clientsMapLock = [GSLazyRecursiveLock new];
beginStatement = RETAIN([NSArray arrayWithObject: beginString]);
commitStatement = RETAIN([NSArray arrayWithObject: commitString]);
rollbackStatement = RETAIN([NSArray arrayWithObject: rollbackString]);
NSStringClass = [NSString class];
NSArrayClass = [NSArray class];
NSSetClass = [NSSet class];
[NSTimer scheduledTimerWithTimeInterval: 1.0
target: self
selector: @selector(_tick:)
userInfo: 0
repeats: YES];
}
}
+ (unsigned int) maxConnections
{
return maxConnections;
}
+ (void) purgeConnections: (NSDate*)since
{
NSMapEnumerator e;
NSString *n;
SQLClient *o;
unsigned int connectionCount = 0;
NSTimeInterval t = [since timeIntervalSinceReferenceDate];
[clientsMapLock lock];
e = NSEnumerateMapTable(clientsMap);
while (NSNextMapEnumeratorPair(&e, (void**)&n, (void**)&o) != 0)
{
if (since != nil)
{
NSTimeInterval when = o->_lastOperation;
if (when < t)
{
[o disconnect];
}
}
if ([o connected] == YES)
{
connectionCount++;
}
}
NSEndMapTableEnumeration(&e);
[clientsMapLock unlock];
while (connectionCount >= maxConnections)
{
SQLClient *other = nil;
NSTimeInterval oldest = 0.0;
connectionCount = 0;
[clientsMapLock lock];
e = NSEnumerateMapTable(clientsMap);
while (NSNextMapEnumeratorPair(&e, (void**)&n, (void**)&o))
{
if ([o connected] == YES)
{
NSTimeInterval when = o->_lastOperation;
connectionCount++;
if (oldest == 0.0 || when < oldest)
{
oldest = when;
other = o;
}
}
}
NSEndMapTableEnumeration(&e);
[clientsMapLock unlock];
connectionCount--;
if ([other debugging] > 0)
{
[other debug:
@"Force disconnect of '%@' because pool size (%d) reached",
other, maxConnections];
}
[other disconnect];
}
}
+ (void) setMaxConnections: (unsigned int)c
{
if (c > 0)
{
maxConnections = c;
[self purgeConnections: nil];
}
}
- (void) begin
{
[lock lock];
if (_inTransaction == NO)
{
_inTransaction = YES;
NS_DURING
{
[self simpleExecute: beginStatement];
}
NS_HANDLER
{
[lock unlock];
_inTransaction = NO;
[localException raise];
}
NS_ENDHANDLER
}
else
{
[lock unlock];
[NSException raise: NSInternalInconsistencyException
format: @"begin used inside transaction"];
}
}
- (NSString*) clientName
{
return _client;
}
- (void) commit
{
[lock lock];
if (_inTransaction == NO)
{
[lock unlock];
[NSException raise: NSInternalInconsistencyException
format: @"commit used outside transaction"];
}
NS_DURING
{
[self simpleExecute: commitStatement];
_inTransaction = NO;
[lock unlock]; // Locked at start of -commit
[lock unlock]; // Locked by -begin
}
NS_HANDLER
{
_inTransaction = NO;
[lock unlock]; // Locked at start of -commit
[lock unlock]; // Locked by -begin
[localException raise];
}
NS_ENDHANDLER
}
- (BOOL) connect
{
if (connected == NO)
{
[lock lock];
if (connected == NO)
{
NS_DURING
{
[self backendConnect];
}
NS_HANDLER
{
[lock unlock];
[localException raise];
}
NS_ENDHANDLER
}
[lock unlock];
}
return connected;
}
- (BOOL) connected
{
return connected;
}
- (NSString*) database
{
return _database;
}
- (void) dealloc
{
NSNotificationCenter *nc;
if (_name != nil)
{
[clientsMapLock lock];
NSMapRemove(clientsMap, (void*)_name);
[clientsMapLock unlock];
}
nc = [NSNotificationCenter defaultCenter];
[nc removeObserver: self];
[self disconnect];
DESTROY(lock);
DESTROY(_client);
DESTROY(_database);
DESTROY(_password);
DESTROY(_user);
DESTROY(_name);
DESTROY(_statements);
DESTROY(_cache);
[super dealloc];
}
- (NSString*) description
{
NSMutableString *s = AUTORELEASE([NSMutableString new]);
[s appendFormat: @"Database - %@\n", [self clientName]];
[s appendFormat: @" Name - %@\n", [self name]];
[s appendFormat: @" DBase - %@\n", [self database]];
[s appendFormat: @" DB User - %@\n", [self user]];
[s appendFormat: @" Password - %@\n",
[self password] == nil ? @"unknown" : @"known"];
[s appendFormat: @" Connected - %@\n", connected ? @"yes" : @"no"];
[s appendFormat: @" Transaction - %@\n", _inTransaction ? @"yes" : @"no"];
if (_cache == nil)
{
[s appendString: @"\n"];
}
else
{
[s appendFormat: @" Cache - %@\n", _cache];
}
return s;
}
- (void) disconnect
{
if (connected == YES)
{
[lock lock];
if (connected == YES)
{
NS_DURING
{
[self backendDisconnect];
}
NS_HANDLER
{
[lock unlock];
[localException raise];
}
NS_ENDHANDLER
}
[lock unlock];
}
}
- (void) execute: (NSString*)stmt, ...
{
NSArray *info;
va_list ap;
va_start (ap, stmt);
info = [self _prepare: stmt args: ap];
va_end (ap);
[self simpleExecute: info];
}
- (void) execute: (NSString*)stmt with: (NSDictionary*)values
{
NSArray *info;
info = [self _substitute: stmt with: values];
[self simpleExecute: info];
}
- (id) init
{
return [self initWithConfiguration: nil name: nil];
}
- (id) initWithConfiguration: (NSDictionary*)config
{
return [self initWithConfiguration: config name: nil];
}
- (id) initWithConfiguration: (NSDictionary*)config
name: (NSString*)reference
{
NSNotification *n;
NSDictionary *conf = config;
id existing;
if (conf == nil)
{
// Pretend the defaults object is a dictionary.
conf = (NSDictionary*)[NSUserDefaults standardUserDefaults];
}
if ([reference isKindOfClass: NSStringClass] == NO)
{
reference = [conf objectForKey: @"SQLClientName"];
if ([reference isKindOfClass: NSStringClass] == NO)
{
reference = [conf objectForKey: @"Database"];
}
}
[clientsMapLock lock];
existing = (SQLClient*)NSMapGet(clientsMap, reference);
if (existing == nil)
{
lock = [GSLazyRecursiveLock new]; // Ensure thread-safety.
[self setDebugging: [[self class] debugging]];
[self setDurationLogging: [[self class] durationLogging]];
[self setName: reference]; // Set name and store in cache.
_statements = [NSMutableArray new];
if ([conf isKindOfClass: [NSUserDefaults class]] == YES)
{
NSNotificationCenter *nc;
nc = [NSNotificationCenter defaultCenter];
[nc addObserver: self
selector: @selector(_configure:)
name: NSUserDefaultsDidChangeNotification
object: conf];
}
n = [NSNotification
notificationWithName: NSUserDefaultsDidChangeNotification
object: conf
userInfo: nil];
[self _configure: n]; // Actually set up the configuration.
}
else
{
RELEASE(self);
self = RETAIN(existing);
}
[clientsMapLock unlock];
return self;
}
- (BOOL) isInTransaction
{
return _inTransaction;
}
- (NSDate*) lastOperation
{
if (_lastOperation > 0.0)
{
return [NSDate dateWithTimeIntervalSinceReferenceDate: _lastOperation];
}
return nil;
}
- (NSString*) name
{
return _name;
}
- (NSString*) password
{
return _password;
}
- (NSMutableArray*) query: (NSString*)stmt, ...
{
va_list ap;
NSMutableArray *result = nil;
/*
* First check validity and concatenate parts of the query.
*/
va_start (ap, stmt);
stmt = [[self _prepare: stmt args: ap] objectAtIndex: 0];
va_end (ap);
result = [self simpleQuery: stmt];
return result;
}
- (NSMutableArray*) query: (NSString*)stmt with: (NSDictionary*)values
{
NSMutableArray *result = nil;
stmt = [[self _substitute: stmt with: values] objectAtIndex: 0];
result = [self simpleQuery: stmt];
return result;
}
- (NSString*) quote: (id)obj
{
/**
* For a nil object, we return NULL.
*/
if (obj == nil || obj == null)
{
return @"NULL";
}
else if ([obj isKindOfClass: NSStringClass] == NO)
{
/**
* For a number, we simply convert directly to a string.
*/
if ([obj isKindOfClass: [NSNumber class]] == YES)
{
return [obj description];
}
/**
* For a date, we convert to the text format used by the database,
* and add leading and trailing quotes.
*/
if ([obj isKindOfClass: NSDateClass] == YES)
{
return [obj descriptionWithCalendarFormat:
@"'%Y-%m-%d %H:%M:%S.%F %z'" timeZone: nil locale: nil];
}
/**
* For a data object, we don't quote ... the other parts of the code
* need to know they have an NSData object and pass it on unchanged
* to the -backendExecute: method.
*/
if ([obj isKindOfClass: [NSData class]] == YES)
{
return obj;
}
/**
* Just in case an NSNull subclass has been created by someone.
* The normal NSNull instance should have been handled earlier.
*/
if ([obj isKindOfClass: [NSNull class]] == YES)
{
return @"NULL";
}
/**
* For an NSArray or NSSet, we produce a bracketed list of the
* (quoted) objects in the array.
*/
if ([obj isKindOfClass: NSArrayClass] == YES ||
[obj isKindOfClass: NSSetClass] == YES)
{
NSMutableString *ms = [NSMutableString stringWithCapacity: 100];
NSEnumerator *enumerator = [obj objectEnumerator];
id value = [enumerator nextObject];
[ms appendString: @"("];
if (value != nil)
{
[ms appendString: [self quote: value]];
}
while ((value = [enumerator nextObject]) != nil)
{
[ms appendString: @","];
[ms appendString: [self quote: value]];
}
[ms appendString: @")"];
return ms;
}
/**
* For any other type of data, we just produce a quoted string
* representation of the objects description.
*/
obj = [obj description];
}
/* Get a string description of the object. */
obj = [self quoteString: obj];
return obj;
}
- (NSString*) quotef: (NSString*)fmt, ...
{
va_list ap;
NSString *str;
NSString *quoted;
va_start(ap, fmt);
str = [[NSString allocWithZone: NSDefaultMallocZone()]
initWithFormat: fmt arguments: ap];
va_end(ap);
quoted = [self quoteString: str];
RELEASE(str);
return quoted;
}
- (NSString*) quoteCString: (const char *)s
{
NSString *str;
NSString *quoted;
if (s == 0)
{
s = "";
}
str = [[NSString alloc] initWithCString: s];
quoted = [self quoteString: str];
RELEASE(str);
return quoted;
}
- (NSString*) quoteChar: (char)c
{
NSString *str;
NSString *quoted;
if (c == 0)
{
[NSException raise: NSInvalidArgumentException
format: @"Attempt to quote a nul character in -quoteChar:"];
}
str = [[NSString alloc] initWithFormat: @"%c", c];
quoted = [self quoteString: str];
RELEASE(str);
return quoted;
}
- (NSString*) quoteFloat: (float)f
{
return [NSString stringWithFormat: @"%f", f];
}
- (NSString*) quoteInteger: (int)i
{
return [NSString stringWithFormat: @"%d", i];
}
- (NSString*) quoteString: (NSString *)s
{
static NSCharacterSet *special = nil;
NSMutableString *m;
NSRange r;
unsigned l;
if (special == nil)
{
NSString *stemp;
/*
* NB. length of C string is 2, so we include a nul character as a
* special.
*/
stemp = [[NSString alloc] initWithBytes: "'"
length: 2
encoding: NSASCIIStringEncoding];
special = [NSCharacterSet characterSetWithCharactersInString: stemp];
RELEASE(stemp);
RETAIN(special);
}
/*
* Step through string removing nul characters
* and escaping quote characters as required.
*/
m = AUTORELEASE([s mutableCopy]);
l = [m length];
r = NSMakeRange(0, l);
r = [m rangeOfCharacterFromSet: special options: NSLiteralSearch range: r];
while (r.length > 0)
{
unichar c = [m characterAtIndex: r.location];
if (c == 0)
{
r.length = 1;
[m replaceCharactersInRange: r withString: @""];
l--;
}
else
{
r.length = 0;
[m replaceCharactersInRange: r withString: @"'"];
l++;
r.location += 2;
}
r = NSMakeRange(r.location, l - r.location);
r = [m rangeOfCharacterFromSet: special
options: NSLiteralSearch
range: r];
}
/* Add quoting around it. */
[m replaceCharactersInRange: NSMakeRange(0, 0) withString: @"'"];
[m appendString: @"'"];
return m;
}
- (void) release
{
/* We lock the table while checking, to prevent
* another thread from grabbing this object while we are
* checking it.
* If we are going to deallocate the object, we first remove
* it from the table so that no other thread will find it
* and try to use it while it is being deallocated.
*/
[clientsMapLock lock];
if (NSDecrementExtraRefCountWasZero(self))
{
[self dealloc];
}
[clientsMapLock unlock];
}
- (void) rollback
{
[lock lock];
if (_inTransaction == YES)
{
_inTransaction = NO;
NS_DURING
{
[self simpleExecute: rollbackStatement];
[lock unlock]; // Locked at start of -rollback
[lock unlock]; // Locked by -begin
}
NS_HANDLER
{
[lock unlock]; // Locked at start of -rollback
[lock unlock]; // Locked by -begin
[localException raise];
}
NS_ENDHANDLER
}
}
- (void) setDatabase: (NSString*)s
{
if ([s isEqual: _database] == NO)
{
if (connected == YES)
{
[self disconnect];
}
ASSIGNCOPY(_database, s);
}
}
- (void) setName: (NSString*)s
{
if ([s isEqual: _name] == NO)
{
[lock lock];
if ([s isEqual: _name] == YES)
{
[lock unlock];
return;
}
[clientsMapLock lock];
if (NSMapGet(clientsMap, s) != 0)
{
[lock unlock];
[clientsMapLock unlock];
if ([self debugging] > 0)
{
[self debug: @"Error attempt to re-use client name %@", s];
}
return;
}
if (connected == YES)
{
[self disconnect];
}
RETAIN(self);
if (_name != nil)
{
NSMapRemove(clientsMap, (void*)_name);
}
ASSIGNCOPY(_name, s);
ASSIGN(_client, [[NSProcessInfo processInfo] globallyUniqueString]);
NSMapInsert(clientsMap, (void*)_name, (void*)self);
[clientsMapLock unlock];
[lock unlock];
RELEASE(self);
}
}
- (void) setPassword: (NSString*)s
{
if ([s isEqual: _password] == NO)
{
if (connected == YES)
{
[self disconnect];
}
ASSIGNCOPY(_password, s);
}
}
- (void) setUser: (NSString*)s
{
if ([s isEqual: _client] == NO)
{
if (connected == YES)
{
[self disconnect];
}
ASSIGNCOPY(_user, s);
}
}
- (void) simpleExecute: (NSArray*)info
{
NSString *statement;
BOOL isCommit = NO;
BOOL isRollback = NO;
[lock lock];
statement = [info objectAtIndex: 0];
if ([statement isEqualToString: commitString])
{
isCommit = YES;
}
if ([statement isEqualToString: rollbackString])
{
isRollback = YES;
}
NS_DURING
{
NSTimeInterval start = 0.0;
if (_duration >= 0)
{
start = GSTickerTimeNow();
}
[self backendExecute: info];
_lastOperation = GSTickerTimeNow();
[_statements addObject: statement];
if (_duration >= 0)
{
NSTimeInterval d;
d = _lastOperation - start;
if (d >= _duration)
{
if (isCommit || isRollback)
{
NSEnumerator *e = [_statements objectEnumerator];
if (isCommit)
{
[self debug:
@"Duration %g for transaction commit ...", d];
}
else
{
[self debug:
@"Duration %g for transaction rollback ...", d];
}
while ((statement = [e nextObject]) != nil)
{
[self debug: @" %@;", statement];
}
}
else if ([self debugging] > 1)
{
/*
* For higher debug levels, we log data objects as well
* as the query string, otherwise we omit them.
*/
[self debug: @"Duration %g for statement %@", d, info];
}
else
{
[self debug: @"Duration %g for statement %@",
d, statement];
}
}
}
if (_inTransaction == NO || isCommit || isRollback)
{
[_statements removeAllObjects];
}
}
NS_HANDLER
{
if (_inTransaction == NO || isCommit || isRollback)
{
[_statements removeAllObjects];
}
[lock unlock];
[localException raise];
}
NS_ENDHANDLER
[lock unlock];
}
- (NSMutableArray*) simpleQuery: (NSString*)stmt
{
NSMutableArray *result = nil;
[lock lock];
NS_DURING
{
NSTimeInterval start = 0.0;
if (_duration >= 0)
{
start = GSTickerTimeNow();
}
result = [self backendQuery: stmt];
_lastOperation = GSTickerTimeNow();
if (_duration >= 0)
{
NSTimeInterval d;
d = _lastOperation - start;
if (d >= _duration)
{
[self debug: @"Duration %g for query %@", d, stmt];
}
}
}
NS_HANDLER
{
[lock unlock];
[localException raise];
}
NS_ENDHANDLER
[lock unlock];
return result;
}
- (NSString*) user
{
return _user;
}
@end
@implementation SQLClient (Subclass)
- (BOOL) backendConnect
{
[NSException raise: NSInternalInconsistencyException
format: @"Called -%@ without backend bundle loaded",
NSStringFromSelector(_cmd)];
return NO;
}
- (void) backendDisconnect
{
[NSException raise: NSInternalInconsistencyException
format: @"Called -%@ without backend bundle loaded",
NSStringFromSelector(_cmd)];
}
- (void) backendExecute: (NSArray*)info
{
[NSException raise: NSInternalInconsistencyException
format: @"Called -%@ without backend bundle loaded",
NSStringFromSelector(_cmd)];
}
- (NSMutableArray*) backendQuery: (NSString*)stmt
{
[NSException raise: NSInternalInconsistencyException
format: @"Called -%@ without backend bundle loaded",
NSStringFromSelector(_cmd)];
return nil;
}
- (unsigned) copyEscapedBLOB: (NSData*)blob into: (void*)buf
{
[NSException raise: NSInternalInconsistencyException
format: @"Called -%@ without backend bundle loaded",
NSStringFromSelector(_cmd)];
return 0;
}
- (const void*) insertBLOBs: (NSArray*)blobs
intoStatement: (const void*)statement
length: (unsigned)sLength
withMarker: (const void*)marker
length: (unsigned)mLength
giving: (unsigned*)result
{
unsigned count = [blobs count];
unsigned length = sLength;
if (count > 1)
{
unsigned i;
unsigned char *buf;
unsigned char *ptr;
const unsigned char *from = (const unsigned char*)statement;
/*
* Calculate length of buffer needed.
*/
for (i = 1; i < count; i++)
{
length += [self lengthOfEscapedBLOB: [blobs objectAtIndex: i]];
length -= mLength;
}
buf = NSZoneMalloc(NSDefaultMallocZone(), length + 1);
[NSData dataWithBytesNoCopy: buf length: length + 1]; // autoreleased
ptr = buf;
/*
* Merge quoted data objects into statement.
*/
i = 1;
from = (unsigned char*)statement;
while (*from != 0)
{
if (*from == *(unsigned char*)marker
&& memcmp(from, marker, mLength) == 0)
{
NSData *d = [blobs objectAtIndex: i++];
from += mLength;
ptr += [self copyEscapedBLOB: d into: ptr];
}
else
{
*ptr++ = *from++;
}
}
*ptr = '\0';
statement = buf;
}
*result = length;
return statement;
}
- (unsigned) lengthOfEscapedBLOB: (NSData*)blob
{
[NSException raise: NSInternalInconsistencyException
format: @"Called -%@ without backend bundle loaded",
NSStringFromSelector(_cmd)];
return 0;
}
@end
@implementation SQLClient (Private)
/**
* Internal method to handle configuration using the notification object.
* This object may be either a configuration front end or a user defaults
* object ... so we have to be careful that we work with both.
*/
- (void) _configure: (NSNotification*)n
{
NSDictionary *o = [n object];
NSDictionary *d;
NSString *s;
Class c;
/*
* get dictionary containing config info for this client by name.
*/
d = [o objectForKey: @"SQLClientReferences"];
if ([d isKindOfClass: [NSDictionary class]] == NO)
{
[self debug: @"Unable to find SQLClientReferences config dictionary"];
d = nil;
}
d = [d objectForKey: _name];
if ([d isKindOfClass: [NSDictionary class]] == NO)
{
[self debug: @"Unable to find config for client '%@'", _name];
d = nil;
}
s = [d objectForKey: @"ServerType"];
if ([s isKindOfClass: NSStringClass] == NO)
{
s = @"Postgres";
}
c = NSClassFromString([@"SQLClient" stringByAppendingString: s]);
if (c == nil)
{
NSString *path;
NSBundle *bundle;
NSArray *paths;
NSMutableArray *tried;
unsigned count;
paths = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory,
NSLocalDomainMask, YES);
count = [paths count];
tried = [NSMutableArray arrayWithCapacity: count];
while (count-- > 0)
{
path = [paths objectAtIndex: count];
path = [path stringByAppendingPathComponent: @"Bundles"];
path = [path stringByAppendingPathComponent: @"SQLClient"];
path = [path stringByAppendingPathComponent: s];
path = [path stringByAppendingPathExtension: @"bundle"];
bundle = [NSBundle bundleWithPath: path];
if (bundle != nil)
{
[tried addObject: path];
if ((c = [bundle principalClass]) != nil)
{
break; // Found it.
}
}
/* Try alternative version with more libraries linked in.
* In some systems and situations the dynamic linker needs
* to haved the SQLClient, gnustep-base, and objc libraries
* explicitly linked into the bundle, but in others it
* requires them to not be linked. To handle that, we create
* two versions of each bundle, the seond version has _libs
* appended to the bundle name, and has the extra libraries linked.
*/
path = [path stringByDeletingPathExtension];
path = [path stringByAppendingString: @"_libs"];
path = [path stringByAppendingPathExtension: @"bundle"];
bundle = [NSBundle bundleWithPath: path];
if (bundle != nil)
{
[tried addObject: path];
if ((c = [bundle principalClass]) != nil)
{
break; // Found it.
}
}
}
if (c == nil)
{
if ([tried count] == 0)
{
[self debug: @"unable to load bundle for '%@' server type"
@" ... failed to locate bundle in %@", s, paths];
}
else
{
[self debug: @"unable to load backend class for '%@' server type"
@" ... dynamic library load failed in %@", s, tried];
}
return;
}
}
if (c != [self class])
{
[self disconnect];
#ifdef GNUSTEP
GSDebugAllocationRemove(self->isa, self);
#endif
self->isa = c;
#ifdef GNUSTEP
GSDebugAllocationAdd(self->isa, self);
#endif
}
s = [d objectForKey: @"Database"];
if ([s isKindOfClass: NSStringClass] == NO)
{
s = [o objectForKey: @"Database"];
if ([s isKindOfClass: NSStringClass] == NO)
{
s = nil;
}
}
[self setDatabase: s];
s = [d objectForKey: @"User"];
if ([s isKindOfClass: NSStringClass] == NO)
{
s = [o objectForKey: @"User"];
if ([s isKindOfClass: NSStringClass] == NO)
{
s = @"";
}
}
[self setUser: s];
s = [d objectForKey: @"Password"];
if ([s isKindOfClass: NSStringClass] == NO)
{
s = [o objectForKey: @"Password"];
if ([s isKindOfClass: NSStringClass] == NO)
{
s = @"";
}
}
[self setPassword: s];
}
/**
* Internal method to build an sql string by quoting any non-string objects
* and concatenating the resulting strings in a nil terminated list.<br />
* Returns an array containing the statement as the first object and
* any NSData objects following. The NSData objects appear in the
* statement strings as the marker sequence - <code>'?'''?'</code>
*/
- (NSArray*) _prepare: (NSString*)stmt args: (va_list)args
{
NSMutableArray *ma = [NSMutableArray arrayWithCapacity: 2];
NSString *tmp = va_arg(args, NSString*);
CREATE_AUTORELEASE_POOL(arp);
if (tmp != nil)
{
NSMutableString *s = [NSMutableString stringWithCapacity: 1024];
[s appendString: stmt];
/*
* Append any values from the nil terminated varargs
*/
while (tmp != nil)
{
if ([tmp isKindOfClass: NSStringClass] == NO)
{
if ([tmp isKindOfClass: [NSData class]] == YES)
{
[ma addObject: tmp];
[s appendString: @"'?'''?'"]; // Marker.
}
else
{
[s appendString: [self quote: tmp]];
}
}
else
{
[s appendString: tmp];
}
tmp = va_arg(args, NSString*);
}
stmt = s;
}
[ma insertObject: stmt atIndex: 0];
DESTROY(arp);
return ma;
}
/**
* Internal method to substitute values from the dictionary into
* a string containing markup identifying where the values should
* appear by name. Non-string objects in the dictionary are quoted.<br />
* Returns an array containing the statement as the first object and
* any NSData objects following. The NSData objects appear in the
* statement strings as the marker sequence - <code>'?'''?'</code>
*/
- (NSArray*) _substitute: (NSString*)str with: (NSDictionary*)vals
{
unsigned int l = [str length];
NSRange r;
NSMutableArray *ma = [NSMutableArray arrayWithCapacity: 2];
CREATE_AUTORELEASE_POOL(arp);
if (l < 2)
{
[ma addObject: str]; // Can't contain a {...} sequence
}
else if ((r = [str rangeOfString: @"{"]).length == 0)
{
[ma addObject: str]; // No '{' markup
}
else if (l - r.location < 2)
{
[ma addObject: str]; // Can't contain a {...} sequence
}
else if ([str rangeOfString: @"}" options: NSLiteralSearch
range: NSMakeRange(r.location, l - r.location)].length == 0
&& [str rangeOfString: @"{{" options: NSLiteralSearch
range: NSMakeRange(0, l)].length == 0)
{
[ma addObject: str]; // No closing '}' or repeated '{{'
}
else if (r.length == 0)
{
[ma addObject: str]; // Nothing to do.
}
else
{
NSMutableString *mtext = AUTORELEASE([str mutableCopy]);
/*
* Replace {FieldName} with the value of the field
*/
while (r.length > 0)
{
unsigned pos = r.location;
unsigned nxt;
unsigned vLength;
NSArray *a;
NSRange s;
NSString *v;
NSString *alt;
id o;
unsigned i;
r.length = l - pos;
/*
* If the length of the string from the '{' onwards is less than two,
* there is nothing to do and we can end processing.
*/
if (r.length < 2)
{
break;
}
if ([mtext characterAtIndex: r.location + 1] == '{')
{
// Got '{{' ... remove one of them.
r.length = 1;
[mtext replaceCharactersInRange: r withString: @""];
l--;
r.location++;
r.length = l - r.location;
r = [mtext rangeOfString: @"{"
options: NSLiteralSearch
range: r];
continue;
}
r = [mtext rangeOfString: @"}"
options: NSLiteralSearch
range: r];
if (r.length == 0)
{
break; // No closing bracket
}
nxt = NSMaxRange(r);
r = NSMakeRange(pos, nxt - pos);
s.location = r.location + 1;
s.length = r.length - 2;
v = [mtext substringWithRange: s];
/*
* If the value contains a '?', it is actually in two parts,
* the first part is the field name, and the second part is
* an alternative text to be used if the value from the
* dictionary is empty.
*/
s = [v rangeOfString: @"?"];
if (s.length == 0)
{
alt = @""; // No alternative value.
}
else
{
alt = [v substringFromIndex: NSMaxRange(s)];
v = [v substringToIndex: s.location];
}
/*
* If the value we are substituting contains dots, we split it apart.
* We use the value to make a reference into the dictionary we are
* given.
*/
a = [v componentsSeparatedByString: @"."];
o = vals;
for (i = 0; i < [a count]; i++)
{
NSString *k = [a objectAtIndex: i];
if ([k length] > 0)
{
o = [(NSDictionary*)o objectForKey: k];
}
}
if (o == vals)
{
v = nil; // Mo match found.
}
else
{
if ([o isKindOfClass: NSStringClass] == YES)
{
v = (NSString*)o;
}
else
{
if ([o isKindOfClass: [NSData class]] == YES)
{
[ma addObject: o];
v = @"'?'''?'";
}
else
{
v = [self quote: o];
}
}
}
if ([v length] == 0)
{
v = alt;
if (v == nil)
{
v = @"";
}
}
vLength = [v length];
[mtext replaceCharactersInRange: r withString: v];
l += vLength; // Add length of string inserted
l -= r.length; // Remove length of string replaced
r.location += vLength;
if (r.location >= l)
{
break;
}
r.length = l - r.location;
r = [mtext rangeOfString: @"{"
options: NSLiteralSearch
range: r];
}
[ma insertObject: mtext atIndex: 0];
}
RELEASE(arp);
return ma;
}
/*
* Called at one second intervals to ensure that our current timestamp
* is reasonably accurate.
*/
+ (void) _tick: (NSTimer*)t
{
(void) GSTickerTimeNow();
}
@end
@implementation SQLClient(Convenience)
- (SQLRecord*) queryRecord: (NSString*)stmt, ...
{
va_list ap;
NSArray *result = nil;
SQLRecord *record;
va_start (ap, stmt);
stmt = [[self _prepare: stmt args: ap] objectAtIndex: 0];
va_end (ap);
result = [self simpleQuery: stmt];
if ([result count] > 1)
{
[NSException raise: NSInvalidArgumentException
format: @"Query returns more than one record -\n%@\n", stmt];
}
record = [result lastObject];
if (record == nil)
{
[NSException raise: SQLEmptyException
format: @"Query returns no data -\n%@\n", stmt];
}
return record;
}
- (NSString*) queryString: (NSString*)stmt, ...
{
va_list ap;
NSArray *result = nil;
SQLRecord *record;
va_start (ap, stmt);
stmt = [[self _prepare: stmt args: ap] objectAtIndex: 0];
va_end (ap);
result = [self simpleQuery: stmt];
if ([result count] > 1)
{
[NSException raise: NSInvalidArgumentException
format: @"Query returns more than one record -\n%@\n", stmt];
}
record = [result lastObject];
if (record == nil)
{
[NSException raise: SQLEmptyException
format: @"Query returns no data -\n%@\n", stmt];
}
if ([record count] > 1)
{
[NSException raise: NSInvalidArgumentException
format: @"Query returns multiple fields -\n%@\n", stmt];
}
return [[record lastObject] description];
}
- (void) singletons: (NSMutableArray*)records
{
unsigned c = [records count];
while (c-- > 0)
{
[records replaceObjectAtIndex: c
withObject: [[records objectAtIndex: c] lastObject]];
}
}
- (SQLTransaction*) transaction
{
TDefs transaction;
transaction = (TDefs)NSAllocateObject([SQLTransaction class], 0,
NSDefaultMallocZone());
transaction->_db = RETAIN(self);
transaction->_info = [NSMutableArray new];
return AUTORELEASE((SQLTransaction*)transaction);
}
@end
@interface SQLClientCacheInfo : NSObject
{
@public
NSString *query;
NSMutableArray *result;
NSTimeInterval expires;
}
@end
@implementation SQLClientCacheInfo
- (void) dealloc
{
DESTROY(query);
DESTROY(result);
[super dealloc];
}
- (unsigned) hash
{
return [query hash];
}
- (BOOL) isEqual: (id)other
{
return [query isEqual: ((SQLClientCacheInfo*)other)->query];
}
@end
@implementation SQLClient (Caching)
- (GSCache*) cache
{
if (_cache == nil)
{
_cache = [GSCache new];
}
return _cache;
}
- (NSMutableArray*) cache: (int)seconds
query: (NSString*)stmt,...
{
va_list ap;
va_start (ap, stmt);
stmt = [[self _prepare: stmt args: ap] objectAtIndex: 0];
va_end (ap);
return [self cache: seconds simpleQuery: stmt];
}
- (NSMutableArray*) cache: (int)seconds
query: (NSString*)stmt
with: (NSDictionary*)values
{
stmt = [[self _substitute: stmt with: values] objectAtIndex: 0];
return [self cache: seconds simpleQuery: stmt];
}
- (NSMutableArray*) cache: (int)seconds simpleQuery: (NSString*)stmt
{
NSMutableArray *result = nil;
[lock lock];
NS_DURING
{
NSTimeInterval start = GSTickerTimeNow();
GSCache *c = [self cache];
id toCache = nil;
if (seconds < 0)
{
seconds = -seconds;
}
else
{
result = [c objectForKey: stmt];
}
if (result == nil)
{
result = toCache = [self backendQuery: stmt];
_lastOperation = GSTickerTimeNow();
if (_duration >= 0)
{
NSTimeInterval d;
d = _lastOperation - start;
if (d >= _duration)
{
[self debug: @"Duration %g for query %@", d, stmt];
}
}
}
if (seconds == 0)
{
// We have been told to remove the existing cached item.
[c setObject: nil forKey: stmt lifetime: seconds];
toCache = nil;
}
if (toCache != nil)
{
// We have a newly retrieved object ... cache it.
[c setObject: toCache forKey: stmt lifetime: seconds];
}
if (result != nil)
{
/*
* Return an autoreleased copy ... not the original cached data.
*/
result = [NSMutableArray arrayWithArray: result];
}
}
NS_HANDLER
{
[lock unlock];
[localException raise];
}
NS_ENDHANDLER
[lock unlock];
return result;
}
- (void) setCache: (GSCache*)aCache
{
ASSIGN(_cache, aCache);
}
@end
@implementation SQLTransaction
- (unsigned) count
{
return _count;
}
- (void) dealloc
{
DESTROY(_db);
DESTROY(_info);
[super dealloc];
}
- (NSString*) description
{
return [NSString stringWithFormat: @"%@ with SQL '%@' for %@",
[super description],
(_count == 0 ? (id)@"" : (id)[_info objectAtIndex: 0]), _db];
}
- (void) _addInfo: (NSArray*)info
{
if (_count == 0)
{
NSMutableString *ms = [[info objectAtIndex: 0] mutableCopy];
[_info addObjectsFromArray: info];
[_info replaceObjectAtIndex: 0 withObject: ms];
RELEASE(ms);
}
else
{
NSMutableString *ms = [_info objectAtIndex: 0];
unsigned c = [info count];
unsigned i = 1;
[ms appendString: @";"];
[ms appendString: [info objectAtIndex: 0]];
while (i < c)
{
[_info addObject: [info objectAtIndex: i++]];
}
}
_count++;
}
- (void) add: (NSString*)stmt,...
{
va_list ap;
va_start (ap, stmt);
[self _addInfo: [_db _prepare: stmt args: ap]];
va_end (ap);
}
- (void) add: (NSString*)stmt with: (NSDictionary*)values
{
[self _addInfo: [_db _substitute: stmt with: values]];
}
- (void) append: (SQLTransaction*)other
{
if (other != nil && other->_count > 0)
{
[self _addInfo: other->_info];
}
}
- (SQLClient*) db
{
return _db;
}
- (void) execute
{
if (_count > 0)
{
BOOL wrapped = NO;
NSMutableString *sql = [_info objectAtIndex: 0];
NS_DURING
{
if (_count > 1 && [_db isInTransaction] == NO)
{
wrapped = YES;
[sql replaceCharactersInRange: NSMakeRange(0, 0)
withString: @"begin;"];
[sql replaceCharactersInRange: NSMakeRange([sql length], 0)
withString: @";commit"];
}
[_db simpleExecute: _info];
if (wrapped == YES)
{
wrapped = NO;
[sql replaceCharactersInRange: NSMakeRange([sql length] - 7, 7)
withString: @""];
[sql replaceCharactersInRange: NSMakeRange(0, 6)
withString: @""];
}
}
NS_HANDLER
{
if (wrapped == YES)
{
[sql replaceCharactersInRange: NSMakeRange([sql length] - 7, 7)
withString: @""];
[sql replaceCharactersInRange: NSMakeRange(0, 6)
withString: @""];
}
[localException raise];
}
NS_ENDHANDLER
}
}
- (void) reset
{
[_info removeAllObjects];
_count = 0;
}
@end
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