为毛要用CoreData，SQLite不是挺好吗？
如果你要用这些代码，请无比仔细测试。
如果你要用这些代码，请无比仔细测试。
欢迎各种拍砖、探讨！
你可以从这里下载
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#import <Foundation/Foundation.h>
typedef
enum
_db_op_result{
SUCCESSED = 0,
FAILED = 1,
CREATE_TABLE_FAILED = 5,
TRANSACTION_EXE_FAILED = 7,
UPDATE_FAILED = 9,
DELETE_FAILED = 10,
NOT_ALL_DONE = 20
} SMPDB_OPERATION_RESULT;
typedef
enum
_db_op_type{
UPDATE = 1,
DELETE = 2,
INSERT = 3,
} SMPDB_OPERTION_TYPE;
@protocol
DbOperationDelegate <
NSObject
>
@optional
- (
NSInteger
)udpate;
- (
NSInteger
)insert;
- (
NSInteger
)
delete
;
- (
NSArray
*)select:(
NSString
*)condition;
- (
NSString
*)tableName;
- (
NSString
*)fieldsString;
- (
NSString
*)queryString;
@end
// SQLite Operation
#import <Foundation/Foundation.h>
#import "sqlite3.h"
#import "DbOperationDelegate.h"
@interface
SMPDbUtil :
NSObject
{
NSString
*databasePath;
sqlite3 *db;
}
@property
(
readonly
)sqlite3 *db;
- (
NSInteger
)createDatabase:(
NSString
*)dbName;
- (
NSInteger
)insert:(
id
<DbOperationDelegate>)obj;
- (
NSInteger
)insertSet:(
NSString
*)tableName tableFields:(
NSArray
*)fields valueSets:(
NSArray
*)values;
- (sqlite3_stmt *)select:(
id
<DbOperationDelegate>)obj conditions:(
NSString
*)cons;
- (
NSInteger
)update:(
id
<DbOperationDelegate>)obj;
@end
//how to use
#import <UIKit/UIKit.h>
#import "DbOperationDelegate.h"
@class
ProvinceInfo;
@interface
CityInfo :
NSObject
<DbOperationDelegate>{
NSInteger
cityId;
NSString
*cityName;
ProvinceInfo *province;
}
@property
(assign)
NSInteger
cityId;
@property
(
copy
)
NSString
*cityName;
@property
(retain)ProvinceInfo *province;
- (
NSInteger
)udpate;
- (
NSInteger
)insert;
- (
NSInteger
)
delete
;
- (
NSArray
*)select;
- (
NSString
*)fieldsString;
- (
NSString
*)queryString;
@end
//.m
#import "CityInfo.h"
#import "ProvinceInfo.h"
#import "SMPDbUtil.h"
#define TABLE_NAME @"city"
@implementation
CityInfo
@synthesize
cityId, cityName, province;
- (
NSString
*)tableName{
return
@
"city"
;
}
- (
NSString
*)fieldsString{
return
@
" id, name, provinceId "
;
}
- (
NSString
*)queryString{
return
[
NSString
stringWithFormat:@
"%d, \"%@\", %d"
,
self
.cityId,
self
.cityName, ((
self
.province ==
nil
? -1 :
self
.province.provinceId))];
}
- (
NSInteger
)udpate{
SMPDbUtil *dbUtil = [[SMPDbUtil alloc]init];
NSInteger
r = [dbUtil update:
self
];
[dbUtil release];
return
r;
}
- (
NSInteger
)insert{
SMPDbUtil *dbUtil = [[SMPDbUtil alloc]init];
NSInteger
r = [dbUtil insert:
self
];
[dbUtil release];
return
r;
}
//- (NSInteger)delete{
// return 0;
//}
- (
NSArray
*)select:(
NSString
*)condition{
SMPDbUtil *dbUtil = [[SMPDbUtil alloc]init];
sqlite3_stmt *statement = [dbUtil select:
self
conditions:condition];
if
(statement ==
NULL
) {
sqlite3_close(dbUtil.db);
return
nil
;
}
NSMutableArray
*array = [[[
NSMutableArray
alloc]init]autorelease];
while (sqlite3_step(statement) == SQLITE_ROW) {
CityInfo *el = [[CityInfo alloc]init];
NSInteger
id
= sqlite3_column_int(statement, 0);
NSString
*name = [[
NSString
alloc] initWithUTF8String:(
const
char
*) sqlite3_column_text(statement, 1)];
NSInteger
provinceId = sqlite3_column_int(statement, 2);
ProvinceInfo *p = [[ProvinceInfo alloc]init];
NSArray
*proList = [p select:[
NSString
stringWithFormat:@
"id = %d"
, provinceId]];
if
(proList !=
nil
&& proList.count > 0) {
p = [proList objectAtIndex:0];
}
el.cityId =
id
;
el.cityName = name;
el.province = p;
[array addObject:el];
[el release];
}
sqlite3_close(dbUtil.db);
[dbUtil release];
return
array;
}
@end
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本文转自张昺华-sky博客园博客，原文链接：http://www.cnblogs.com/sunshine-anycall/archive/2012/03/02/2377647.html
，如需转载请自行联系原作者
