Objective-C SQLiteHelper

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。

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

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