注意：
1.使用該方法時注意要給項目中添加database.h和database.m文件以及PlausibleDatabase.framework框架。
2.在框架中導入libsqlite3.dylib框架。
3.把你的sqlite文件添加到項目中
4.在database.m文件中修改以下內容。
5.正式開始--------------------------------------------------------------------------------
啓動數據庫並進行查詢操作
-(void)refreshArray{
PLSqliteDatabase *db = [DataBasesetup];
NSString *sql = [NSStringstringWithFormat:@"select * from %@",attribute];
id<PLResultSet>rs = [dbexecuteQuery:sql];
while ([rsnext]) {
NSMutableDictionary *myDict = [[NSMutableDictionaryalloc]init];
NSString *list = [rsstringForColumn:@"list"];
[myDict setObject:listforKey:@"list"];
// NSLog(@"list ---- %@",list);
NSString *words = [rsstringForColumn:@"words"];
[myDict setObject:wordsforKey:@"words"];
// NSLog(@"words ---- %@",words);
NSData *picData = [rsdataForColumn:@"picture"];
// NSLog(@"picData ---- %@",picData);
[myDict setObject:picDataforKey:@"picture"];
[myArrayaddObject:myDict];
[myDict release];
}
}
向sqlite數據庫插入和讀取二進制圖片數據 (for ios)
假定數據庫中存在表 test_table(name,image),下面代碼將圖片文件test.png的二進制數據寫到sqlite數據庫：
UIImage *image = [UIImageimageNamed:@"tree.png"];
NSData *data = UIImagePNGRepresentation(image);
NSString *sql = [NSStringstringWithFormat:@"insert into test_table values('%@')",data];
PLSqliteDatabase *db = [DataBasesetup];
[db executeUpdate:sql];
下面代碼從數據庫中讀取圖片二進制數據，然後轉換成圖片image格式：
NSString *sql =@"select picture from test_table where mnumber=1";
PLSqliteDatabase *db = [DataBasesetup];
id<PLResultSet>rs = [dbexecuteQuery:sql];
while ([rsnext]) {
NSData *data = [rsdataForColumn:@"picture"];
UIImage *image = [UIImageimageWithData:data];//此即爲讀出的圖片，然後按你自己的需求使用即可
}
下面代碼將圖片文件test.png的二進制數據寫到sqlite數據庫：
char *name = "test";
NSString * nameString = [NSString stringWithCString:name encoding:NSUTF8StringEncoding];
NSString * filePath = [[NSBundle mainBundle] pathForResource:nameString ofType:@"png"];
if ([[NSFileManager defaultManager] fileExistsAtPath:filePath])
{
NSData * imgData = UIImagePNGRepresentation([UIImage imageWithContentsOfFile:filePath]);
const char * sequel = "insert into test_table(name,image) values(?,?)";
sqlite3_stmt * update;
if (sqlite3_prepare_v2(database, sequel, -1, &update, NULL) == SQLITE_OK)
{
sqlite3_bind_text(update, 1, name, -1, NULL);
sqlite3_bind_blob(update, 2, [imgData bytes], [imgData length], NULL);
if( sqlite3_step(update) == SQLITE_DONE)
{ NSLog(@"已經寫入數據"); }
sqlite3_finalize(update);
}
}
else
{ System Italic 27.0 NSLog(@"文件不存在"); }
下面代碼從數據庫中讀取圖片二進制數據，然後顯示圖片：
const char * sequel = "select image from test_table where name=?";
sqlite3_stmt * getimg;
if (sqlite3_prepare_v2(database, sequel, -1, &getimg, NULL) == SQLITE_OK)
{
char *name = "test";
sqlite3_bind_text(update, 1, name, -1, NULL);
if(sqlite3_step(getimg) == SQLITE_ROW)
{
int bytes = sqlite3_column_bytes(getimg, 0);
Byte * value = (Byte*)sqlite3_column_blob(getimg, 1);
if (bytes !=0 && value != NULL)
{
NSData * data = [NSData dataWithBytes:value length:bytes];
UIImage * img = [UIImage imageWithData:data];
UIImageView * aview =[[UIImageView alloc] initWithFrame:CGRectMake(0.0, 0.0, IMAGE_WIDTH, IMAGE_HEIGHT)];
aview.image = img;
[self.view addSubview:aview];
[aview release];
}
}
sqlite3_finalize(getimg);
}