sqlite数据库在IOS中的运用

下面是本人写的sqlite数据库在IOS中使用的通用代码，欢迎大家拍砖指正。

在使用前需要先添加libsqlite3.0.dylib

DataInit.h

#import <Foundation/Foundation.h>

#import "sqlite3.h"

@interface DataInit : NSObject

{

NSMutableArray *dataArray;//该数组用于存放从数据库中读取的数据

sqlite3 *database;

}

@property (nonatomic,retain) NSMutableArray *dataArray;

//建立的DataInit单例模型

+(DataInit*)sharedDataInit;

//添加数据到sqlite数据库中

//sql:所要执行的sql插入语句

//_valueString:要插入的数据串

//_indexString:要插入的数据串在数据库中每个数据所在的列的位置

-(BOOL)addDataWithsqlClause:(char *)sql withString:(NSString *)_valueString withIndexString:(NSString *)_indexString;

-(BOOL)insertWithsqlClause:(char *)sqlInsert withString:(NSString *)_valueString withIndexString:(NSString *)_indexString;

//通过程序代码创建sqlite数据库

- (BOOL)createEditableCopyOfDatabaseIfNeeded ;

// 查询数据库，并存储数据到数组中

- (void)initializeDatabaseTableSelectsql:(const char *)sql getDataSQL:(const char *)sql1 withIndexCount:(int)_indexCount;

-(NSString *)getStringValueWithPrimaryKey:(NSInteger)pk withSelectSQL:(const char *)sql withIndexCount:(int)_indexCount;

//更新数据库纪录

-(BOOL)updateDataWithSQLClause:(constchar*)sql;

-(BOOL)updateWithsqlClause:(constchar *)sqlupdate;

@end

DataInit.m

#import "DataInit.h"

#import "DataFile.h"

static sqlite3_stmt *insert_statement = nil;

static sqlite3_stmt *init_statement = nil;

static sqlite3_stmt *delete_statement = nil;

static sqlite3_stmt *update_statement = nil;

@implementation DataInit

@synthesize dataArray;

static DataInit *initdatabase = nil;

+(DataInit*)sharedDataInit

{

@synchronized(self)

{

if(initdatabase==nil)

{

[[self alloc]init];

}

}

returninitdatabase;

}

+ (id)allocWithZone:(NSZone *)zone

{

@synchronized(self)

{

if (initdatabase == nil)

{

initdatabase = [super allocWithZone:zone];

returninitdatabase; // assignment and return on first allocation

}

}

returnnil; //on subsequent allocation attempts return nil

}

- (id)copyWithZone:(NSZone *)zone

{

returnself;

}

- (id)retain

{

returnself;

}

- (unsigned)retainCount

{

returnUINT_MAX; //denotes an object that cannot be released

}

- (void)release

{

//do nothing

}

- (id)autorelease

{

returnself;

}

///*

- init

{

if (self = [super init])

{

self.dataArray = [[NSMutableArrayalloc]init];

}

returnself;

}

-(void)dealloc

{

[dataArrayremoveAllObjects];

[dataArrayrelease];

[superdealloc];

}

//*/

// Creates a writable copy of the bundled default database in the application Documents directory.

- (BOOL)createEditableCopyOfDatabaseIfNeeded

{

// First, test for existence.

BOOL success;

NSFileManager *fileManager = [NSFileManagerdefaultManager];

//NSError *error;

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

NSString *documentsDirectory = [paths objectAtIndex:0];

NSString *writableDBPath = [documentsDirectory stringByAppendingPathComponent:DATABASE];

success = [fileManager fileExistsAtPath:writableDBPath];

if (success)

returnYES;

success = [fileManager createFileAtPath:writableDBPath contents:nil attributes:nil];

//*

//Create tables for the database in the first time

int isexecuate = -1;

if(success)

{

if(sqlite3_open([writableDBPath UTF8String], &database) == SQLITE_OK)

{

constchar *sql = "create table songlist (songlist_id integer primary key autoincrement,net_id nvarchar(48),email nvarchar(48),title nvarchar(48),body text(48),created nvarchar(48),downloadtimes nvarchar(48),remember nvarchar(48),favorite nvarchar(48) )";

isexecuate = sqlite3_exec(database, sql,NULL,NULL,NULL);

if(isexecuate!=SQLITE_OK)

{

#ifTARGET_IPHONE_SIMULATOR

NSAssert1(0,@"failed to create table songlist with message '%@'.",sqlite3_errmsg(database));

#endif

}

constchar *sql1 = "create table playsongs (songlist_id integer primary key autoincrement,title nvarchar(48),soundwords text(48))";

isexecuate = sqlite3_exec(database, sql1,NULL,NULL,NULL);

if(isexecuate!=SQLITE_OK)

{

#ifTARGET_IPHONE_SIMULATOR

NSAssert1(0,@"failed to create table playsongs with message '%@'.",sqlite3_errmsg(database));

#endif

}

}

}

if (isexecuate==SQLITE_OK)

{

#if TARGET_IPHONE_SIMULATOR

NSLog(@"create success");

#endif

returnYES;

}

else

{

#ifTARGET_IPHONE_SIMULATOR

NSLog(@"create fail");

#endif

returnNO;

}

}

#pragma mark 数据库操作

+(void)finalizeStatements

{

if(insert_statement)

sqlite3_finalize(insert_statement);

if(init_statement)

sqlite3_finalize(init_statement);

if(delete_statement)

sqlite3_finalize(delete_statement);

}

- (void)initializeDatabaseTableSelectsql:(const char *)sql getDataSQL:(const char *)sql1 withIndexCount:(int)_indexCount

{

[self.dataArrayremoveAllObjects];

database = nil;

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

NSString *documentsDirectory = [paths objectAtIndex:0];

NSString *path = [documentsDirectory stringByAppendingPathComponent:DATABASE];

// Open the database. The database was prepared outside the application.

if (sqlite3_open([path UTF8String], &database) == SQLITE_OK)

{

sqlite3_stmt *statement;

if (sqlite3_prepare_v2(database, sql, -1, &statement, NULL) == SQLITE_OK)

{

// We "step" through the results - once for each row.

while (sqlite3_step(statement) == SQLITE_ROW)

{

int primaryKey = sqlite3_column_int(statement, 0);

NSString *valueString = [selfgetStringValueWithPrimaryKey:primaryKey withSelectSQL:sql1 withIndexCount:_indexCount];

[dataArray addObject:valueString];

}

}

sqlite3_finalize(statement);

sqlite3_close(database);

}

else

{

// Even though the open failed, call close to properly clean up resources.

sqlite3_close(database);

#ifTARGET_IPHONE_SIMULATOR

NSAssert1(0, @"Failed to open database with message '%s'.", sqlite3_errmsg(database));

#endif

}

}

-(BOOL)addDataWithsqlClause:(char *)sql withString:(NSString *)_valueString withIndexString:(NSString *)_indexString

{

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

NSString *documentsDirectory = [paths objectAtIndex:0];

NSString *path = [documentsDirectory stringByAppendingPathComponent:DATABASE];

if (sqlite3_open([path UTF8String], &database) == SQLITE_OK)

{

return [selfinsertWithsqlClause:sql withString:_valueString withIndexString:_indexString];

}

returnNO;

}

-(BOOL)updateDataWithSQLClause:(const char*)sql

{

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

NSString *documentsDirectory = [paths objectAtIndex:0];

NSString *path = [documentsDirectory stringByAppendingPathComponent:DATABASE];

if (sqlite3_open([path UTF8String], &database) == SQLITE_OK)

{

return [selfupdateWithsqlClause:sql];

}

returnNO;

}

-(NSString *)getStringValueWithPrimaryKey:(NSInteger)pk withSelectSQL:(const char *)sql withIndexCount:(int)_indexCount

{

int success = -1;

NSString *returnString = @"";

success = sqlite3_prepare_v2(database, sql, -1, &init_statement, NULL);

if (success!=SQLITE_OK)

{

#if TARGET_IPHONE_SIMULATOR

NSAssert1(0,@"Error: failed to prepare statement with message '%s'.",sqlite3_errmsg(database));

#endif

returnString = @"-1";

return returnString;

}

if (sqlite3_column_count(init_statement)<_indexCount)

{

returnString = @"-2";

return returnString;

}

sqlite3_bind_int(init_statement, 1, pk);

if(sqlite3_step(init_statement)==SQLITE_ROW)

{

for (int i=0; i<_indexCount; i++)

{

if ([returnString isEqualToString:@""])

{

returnString =[NSStringstringWithFormat:@"%@",[NSStringstringWithUTF8String:(char *)sqlite3_column_text(init_statement, i)]];

}

else

{

returnString =[NSStringstringWithFormat:@"%@,%@",returnString,[NSStringstringWithUTF8String:(char *)sqlite3_column_text(init_statement, i)]];

}

//NSLog(@"returnString = %@",returnString);

}

}

sqlite3_reset(init_statement);

return returnString;

}

-(BOOL)insertWithsqlClause:(char *)sqlInsert withString:(NSString *)_valueString withIndexString:(NSString *)_indexString

{

int success = -1;

if(insert_statement == nil)

{

success = sqlite3_prepare_v2(database, sqlInsert, -1, &insert_statement, NULL);

if(success!=SQLITE_OK)

{

#if TARGET_IPHONE_SIMULATOR

NSAssert1(0,@"Error: failed to prepare statement with message '%s .",sqlite3_errmsg(database));

#endif

}

}

if (success!=SQLITE_OK)

{

#ifTARGET_IPHONE_SIMULATOR

NSLog(@"prepare fail");

#endif

returnNO;

}

NSArray *valueArray = [_valueString componentsSeparatedByString:@","];

NSArray *indexArray = [_indexString componentsSeparatedByString:@","];

if (valueArray.count==indexArray.count)

{

for (int i=0; i<valueArray.count; i++)

{

int index = [[indexArray objectAtIndex:i]intValue];

NSString *tempString = [valueArray objectAtIndex:i];

sqlite3_bind_text(insert_statement,index,[tempString UTF8String],-1,SQLITE_TRANSIENT);

}

success = sqlite3_step(insert_statement);

if (success==SQLITE_ERROR)

{

sqlite3_reset(insert_statement);

sqlite3_finalize(insert_statement);

sqlite3_close(database);

insert_statement = nil;

database = nil;

returnNO;

}

sqlite3_reset(insert_statement);

sqlite3_finalize(insert_statement);

sqlite3_close(database);

insert_statement = nil;

database = nil;

}//*/

returnYES;

}

-(BOOL)updateWithsqlClause:(const char *)sqlupdate

{

int success = -1;

if(update_statement == nil)

{

success = sqlite3_prepare_v2(database, sqlupdate, -1, &update_statement, NULL);

if(success!=SQLITE_OK)

{

#if TARGET_IPHONE_SIMULATOR

NSAssert1(0,@"Error: failed to prepare statement with message '%s .",sqlite3_errmsg(database));

#endif

}

}

if (success!=SQLITE_OK)

{

#ifTARGET_IPHONE_SIMULATOR

NSLog(@"prepare fail");

#endif

returnNO;

}

success = sqlite3_step(update_statement);

if (success==SQLITE_DONE)

{

sqlite3_finalize(update_statement);

sqlite3_close(database);

update_statement = nil;

database = nil;

}

if (success==SQLITE_ERROR)

{

sqlite3_reset(update_statement);

sqlite3_finalize(update_statement);

sqlite3_close(database);

update_statement = nil;

database = nil;

returnNO;

}

returnYES;

}