关于Sqlite iPad那些事是本文要介绍的内容,主要是来学习ipad中Sqlite数据库的内容,首先添加APPLE提供的 sqlite 操作用程序库 ibsqlite3.0.dylib 到工程中。
位置如下
/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS${VER}.sdk/usr/lib/libsqlite3.0.dylib
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sqlite3 *database;
NSArray *paths= NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *strPaths = [documentsDirectory stringByAppendingPathComponent:kFilename];
if (sqlite3_open([strPaths UTF8String], &database) != SQLITE_OK) {
sqlite3_close(database);
NSAssert(0, @"Failed to open databse");
}
NSString *createSQL = @"CREATE TABLE IF NOT EXISTS FIELDS (ROW INTEGER PRIMARY KEY, FIELD_DATA TEXT)";
if(sqlite3_exec(database, [createSQL UTF8String], NULL, NULL, &errorMsg) != SQLITE_OK){
sqlite3_close(database);
NSAssert1(1, @"Error create table :%s", errorMsg);
}
NSString *query = @"SELECT ROW ,FIELD_DATA FROM FIELDS ORDER BY ROW";
sqlite3_stmt *statement;
if(sqlite3_prepare_v2(database, [query UTF8String], -1, &statement, nil) == SQLITE_OK){
while (sqlite3_step(statement) == SQLITE_ROW) {
int row = sqlite3_column_int(statement, 0);
char *rowData = (char *)sqlite3_column_text(statement, 1);
NSString *fieldName = [[NSString alloc] initWithFormat:@"field%d", row];
NSString *fieldValue = [[NSString alloc] initWithUTF8String:rowData];
UITextField *field = [self valueForKey:fieldName];
field.text = fieldValue;
[fieldName release];
//[fieldName release];
[fieldValue release];
}
sqlite3_finalize (statement);
}
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sqllite存在沙盒内,所以打开的时候不需要name和password,但由于字符的格式不用,所以需要通过,[nsString, UTF8String]来转换。
sqlite3_prepare_v2(database, [query UTF8String], -1, &statement, nil),这是执行sql语句的命令。statement记录状态。
sqlite3_column_*(statement, 0);返回字段值
sqlite3_finalize (statement);结束退出
#import "SQLiteTutorialAppDelegate.h"
#import "RootViewController.h"
#import "Animal.h" // Import the animal object header
@implementation SQLiteTutorialAppDelegate
@synthesize window;
@synthesize navigationController;
@synthesize animals; // Synthesize the aminals array
- (void)applicationDidFinishLaunching:(UIApplication *)application {
// Setup some globals
databaseName = @"AnimalDatabase.sql";
// Get the path to the documents directory and append the databaseName
NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDir = [documentPaths objectAtIndex:0];
databasePath = [documentsDir stringByAppendingPathComponent:databaseName];
// Execute the "checkAndCreateDatabase" function
[self checkAndCreateDatabase];
// Query the database for all animal records and construct the "animals" array
[self readAnimalsFromDatabase];
// Configure and show the window
[window addSubview:[navigationController view]];
[window makeKeyAndVisible];
}
- (void)applicationWillTerminate:(UIApplication *)application {
// Save data if appropriate
}
- (void)dealloc {
[animals release];
[navigationController release];
[window release];
[super dealloc];
}
-(void) checkAndCreateDatabase{
// Check if the SQL database has already been saved to the users phone, if not then copy it over
BOOL success;
// Create a FileManager object, we will use this to check the status
// of the database and to copy it over if required
NSFileManager *fileManager = [NSFileManager defaultManager];
// Check if the database has already been created in the users filesystem
success = [fileManager fileExistsAtPath:databasePath];
// If the database already exists then return without doing anything
if(success) return;
// If not then proceed to copy the database from the application to the users filesystem
// Get the path to the database in the application package
NSString *databasePathFromApp = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:databaseName];
// Copy the database from the package to the users filesystem
[fileManager copyItemAtPath:databasePathFromApp toPath:databasePath error:nil];
[fileManager release];
}
-(void) readAnimalsFromDatabase {
// Setup the database object
sqlite3 *database;
// Init the animals Array
animals = [[NSMutableArray alloc] init];
// Open the database from the users filessytem
if(sqlite3_open([databasePath UTF8String], &database) == SQLITE_OK) {
// Setup the SQL Statement and compile it for faster access
const char *sqlStatement = "select * from animals";
sqlite3_stmt *compiledStatement;
if(sqlite3_prepare_v2(database, sqlStatement, -1, &compiledStatement, NULL) == SQLITE_OK) {
// Loop through the results and add them to the feeds array
while(sqlite3_step(compiledStatement) == SQLITE_ROW) {
// Read the data from the result row
NSString *aName = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 1)];
NSString *aDescription = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 2)];
NSString *aImageUrl = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 3)];
// Create a new animal object with the data from the database
Animal *animal = [[Animal alloc] initWithName:aName description:aDescription url:aImageUrl];
// Add the animal object to the animals Array
[animals addObject:animal];
[animal release];
}
}
// Release the compiled statement from memory
sqlite3_finalize(compiledStatement);
}
sqlite3_close(database);
}
@end
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下面这2句都不可以执行
if (select count(*) from sqlite_master where table="TB_Clothing_Main")
DROP TABLE "TB_Clothing_Main";
if EXISTS (select count(*) from sqlite_master where name = 'TB_Clothing_Main')
DROP TABLE 'TB_Clothing_Main';
BEGIN;
CREATE TABLE [TB_Clothing_Main] (
[clothing_ID] INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,
[clothing_who] INTEGER NOT NULL,
[clothing_decription] NVARCHAR(128) NULL,
[clothing_brend] INTEGER NOT NULL,
[clothing_buy_location_ID] INTEGER NOT NULL,
[clothing_store_location_ID] INTEGER NOT NULL,
[clothing_size_shoulder] FLOAT NULL,
[clothing_size_chest] FLOAT NULL,
[clothing_size_waist] FLOAT NULL,
[clothing_size_hip] FLOAT NULL,
[clothing_size_length] FLOAT NULL,
[clothing_type] INTEGER NOT NULL,
[clothing_price] FLOAT NULL,
[clothing_main_picture] NVARCHAR(128) NULL
);
INSERT INTO "TB_Clothing_Main" VALUES(0, 1, 'marc jacobs blue short T', 1, 2, 1, 37.5, 45, 38, NULL, 66, 0, NULL, 'mj01');
INSERT INTO "TB_Clothing_Main" VALUES(1, 1, 'marc jacobs pink short T', 1, 1, 0, 37, 43.5, 36, NULL, 64, 0, NULL, 'mj02');
INSERT INTO "TB_Clothing_Main" VALUES(2, 2, 'nautica blue coat', 0, 0, 2, 41, 49.5, 47.2, NULL, 60, 1, NULL, 'baba01');
INSERT INTO "TB_Clothing_Main" VALUES(3, 1, 'juicy yellow coat', 3, 1, 3, 40, 45.1, 40.2, 47 , 62, 2, 1080.2, 'juicy01');
INSERT INTO "TB_Clothing_Main" VALUES(4, 1, 'siwy jeans', 4, 1, 3, NULL, NULL, 78, 93 , 94, 3, 1380, 'siwy01');
COMMIT;
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小结:关于Sqlite iPad那些事的内容介绍完了,希望通过本文的学习能对你有所帮助!