{"id":293,"date":"2010-10-27T22:39:01","date_gmt":"2010-10-27T20:39:01","guid":{"rendered":"http:\/\/www.albertopasca.it\/whiletrue\/?p=293"},"modified":"2018-05-25T17:10:22","modified_gmt":"2018-05-25T15:10:22","slug":"objective-c-use-database-with-sql-lite","status":"publish","type":"post","link":"https:\/\/www.albertopasca.it\/whiletrue\/objective-c-use-database-with-sql-lite\/","title":{"rendered":"[Objective-C] Use database with sql (lite)"},"content":{"rendered":"

Here a simple tutorial to use\u00a0SQLite in Objective-C<\/strong>\u00a0to make complex iphone|ipad applications that uses a\u00a0database<\/em>!<\/p>\n

First of all, you\u00a0NEED<\/em>\u00a0to\u00a0download Firefox<\/strong><\/a>, after that you need to download and install\u00a0SQLite Manager<\/strong>\u00a0Add On for Firefox<\/em>\u00a0from here<\/a>.
\nThe plugin will be used later\u2026<\/p>\n

<\/p>\n

Now, create a new project and\u00a0import SQLite library<\/em>. Generally it is located here:<\/p>\n

\/Developer\/Platforms\/iPhoneOS.platform\/Developer\/SDKs\/iPhoneOS.X.X.X.sdk\/usr\/lib\/libsqlite3.dylib<\/p><\/blockquote>\n

\"Firefox!\"<\/center>
\nIn your header file, you need t add the import and create\u00a0sqlite3<\/em>\u00a0class in your interface:<\/p>\n

[code lang=”java” autolinks=”false” collapse=”false” firstline=”1″ gutter=”true” htmlscript=”false” light=”false” padlinenumbers=”false” smarttabs=”true” tabsize=”4″ toolbar=”false”]#import <sqlite3 .h>
\n[…]
\nsqlite3\u00a0*database;[\/code]<\/p>\n

I show only three method that uses the db,\u00a0SELECT<\/strong>,\u00a0DELETE<\/strong>,\u00a0INSERT<\/strong>.<\/p>\n

READ DATA (like SELECT * FROM XXX)<\/strong><\/p>\n

[code lang=”java” autolinks=”false” collapse=”false” firstline=”1″ gutter=”true” htmlscript=”false” light=”false” padlinenumbers=”false” smarttabs=”true” tabsize=”4″ toolbar=”false”]-\u00a0(NSMutableArray*)\u00a0readDataFromDatabase
\n{
\n dataArray \u00a0=\u00a0[[NSMutableArray\u00a0alloc]\u00a0init];
\n dataStored\u00a0=\u00a0[[NSMutableDictionary\u00a0alloc]\u00a0init];<\/p>\n

NSString\u00a0*name;
\n NSString\u00a0*address;<\/p>\n

NSArray\u00a0*paths\u00a0=\u00a0NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask,\u00a0YES);
\n NSString\u00a0*documentsDirectory\u00a0=\u00a0[paths objectAtIndex:0];
\n NSString\u00a0*path\u00a0=\u00a0[documentsDirectory stringByAppendingPathComponent:@"MyDB.sqlite"];<\/p>\n

if\u00a0(sqlite3_open([path UTF8String],\u00a0&amp;database)\u00a0==\u00a0SQLITE_OK)\u00a0{
\n const\u00a0char\u00a0*sql\u00a0=\u00a0"SELECT * FROM tabella";
\n sqlite3_stmt\u00a0*statement;
\n if\u00a0(sqlite3_prepare_v2(database, sql,\u00a0-1,\u00a0&amp;statement,\u00a0NULL)\u00a0==\u00a0SQLITE_OK)\u00a0{
\n while\u00a0(sqlite3_step(statement)\u00a0==\u00a0SQLITE_ROW)\u00a0{
\n name\u00a0=\u00a0\u00a0\u00a0[NSString\u00a0stringWithUTF8String:(char\u00a0*)sqlite3_column_text(statement,\u00a01)];
\n address\u00a0=\u00a0[NSString\u00a0stringWithUTF8String:(char\u00a0*)sqlite3_column_text(statement,\u00a02)];<\/p>\n

[dataStored setObject:name forKey:@"name"];
\n [dataStored setObject:address forKey:@"address"];<\/p>\n

[dataArray addObject:[dataStored copy]];
\n }
\n }
\n sqlite3_finalize(statement);
\n }
\n sqlite3_close(database);
\n [dataStored release];<\/p>\n

return\u00a0dataArray;
\n}[\/code]<\/p>\n

In this method, that return a\u00a0NSMutableArray<\/strong>, I used a\u00a0NSMutableDictionary<\/strong>\u00a0(dataStored) and a\u00a0NSMutableArray<\/strong>\u00a0(dataArray).
\nNow we have a dataArray with lists of the select query!<\/p>\n

DELETE DATA FROM xxx<\/strong><\/p>\n

[code lang=”java” autolinks=”false” collapse=”false” firstline=”1″ gutter=”true” htmlscript=”false” light=”false” padlinenumbers=”false” smarttabs=”true” tabsize=”4″ toolbar=”false”]-\u00a0(void)\u00a0deleteDataFromDatabase:(id)\u00a0data
\n{
\n NSMutableDictionary\u00a0*d\u00a0=\u00a0data;<\/p>\n

NSArray\u00a0*paths\u00a0=\u00a0NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask,\u00a0YES);
\n NSString\u00a0*documentsDirectory\u00a0=\u00a0[paths objectAtIndex:0];
\n NSString\u00a0*path\u00a0=\u00a0[documentsDirectory stringByAppendingPathComponent:@"MyDB.sqlite"];<\/p>\n

sqlite3_stmt\u00a0*delete_statment\u00a0=\u00a0nil;
\n if\u00a0(sqlite3_open([path UTF8String],\u00a0&amp;database)\u00a0==\u00a0SQLITE_OK)\u00a0{
\n if\u00a0(delete_statment\u00a0==\u00a0nil)\u00a0{
\n const\u00a0char\u00a0*sql\u00a0=\u00a0"DELETE FROM tabella WHERE name=? AND address=?";
\n if\u00a0(sqlite3_prepare_v2(database, sql,\u00a0-1,\u00a0&amp;delete_statment,\u00a0NULL)\u00a0!=\u00a0SQLITE_OK)\u00a0{
\n NSAssert1(0,\u00a0@"Error: failed to prepare statement with message ‘%s’.", sqlite3_errmsg(database));
\n }
\n }
\n sqlite3_bind_text(delete_statment,\u00a02,\u00a0[[d objectForKey:@"name"]\u00a0UTF8String],\u00a0-1, \u00a0SQLITE_TRANSIENT);
\n sqlite3_bind_text(delete_statment,\u00a03,\u00a0[[d objectForKey:@"address"]\u00a0UTF8String],\u00a0-1, \u00a0SQLITE_TRANSIENT);<\/p>\n

int\u00a0success\u00a0=\u00a0sqlite3_step(delete_statment);<\/p>\n

if\u00a0(success\u00a0!=\u00a0SQLITE_DONE)\u00a0{
\n NSAssert1(0,\u00a0@"Error: failed to save priority with message ‘%s’.", sqlite3_errmsg(database));
\n }\u00a0else\u00a0{
\n sqlite3_reset(delete_statment);
\n }
\n }
\n sqlite3_close(database);
\n}[\/code]<\/p>\n

Here, you can delete a value from db. (delete from tabella where x=0 and y=0). It accept ad method parameter an object, that is necessary a NSMutableDictionary (first row).<\/p>\n

INSERT DATA<\/strong><\/p>\n

[code lang=”java” autolinks=”false” collapse=”false” firstline=”1″ gutter=”true” htmlscript=”false” light=”false” padlinenumbers=”false” smarttabs=”true” tabsize=”4″ toolbar=”false”]-\u00a0(void)\u00a0insertDataInDatabase:(NSString*)name address:(NSString*)address
\n{
\n sqlite3_stmt\u00a0*insert_statement\u00a0=\u00a0nil;
\n NSArray\u00a0*paths\u00a0=\u00a0NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask,\u00a0YES);
\n NSString\u00a0*documentsDirectory\u00a0=\u00a0[paths objectAtIndex:0];
\n NSString\u00a0*path\u00a0=\u00a0[documentsDirectory stringByAppendingPathComponent:@"MyDB.sqlite"];<\/p>\n

if\u00a0(sqlite3_open([path UTF8String],\u00a0&amp;database)\u00a0==\u00a0SQLITE_OK)\u00a0{
\n if\u00a0(insert_statement\u00a0==\u00a0nil)\u00a0{
\n static\u00a0char\u00a0*sql\u00a0=\u00a0"INSERT INTO tabella (name,address) VALUES(?,?)";
\n if\u00a0(sqlite3_prepare_v2(database, sql,\u00a0-1,\u00a0&amp;insert_statement,\u00a0NULL)\u00a0!=\u00a0SQLITE_OK)\u00a0{
\n NSAssert1(0,\u00a0@"Error: failed to prepare statement with message ‘%s’.", sqlite3_errmsg(database));
\n }<\/p>\n

sqlite3_bind_text(insert_statement,\u00a02,\u00a0[name UTF8String],\u00a0-1, \u00a0SQLITE_TRANSIENT\u00a0);
\n sqlite3_bind_text(insert_statement,\u00a03,\u00a0[address UTF8String],\u00a0-1, SQLITE_TRANSIENT\u00a0);
\n }<\/p>\n

int\u00a0success\u00a0=\u00a0sqlite3_step(insert_statement);<\/p>\n

sqlite3_reset(insert_statement);
\n if\u00a0(success\u00a0!=\u00a0SQLITE_ERROR)\u00a0{
\n NSLog(@"error");
\n }
\n }
\n sqlite3_finalize(insert_statement);
\n sqlite3_close(database);
\n}[\/code]<\/p>\n

In this method you can add values to the table.<\/p>\n

First of all operations, you need call createEditableCopyOfDatabaseIfNeeded that locate (and copy to exec path) the db:<\/p>\n

[code lang=”java” autolinks=”false” collapse=”false” firstline=”1″ gutter=”true” htmlscript=”false” light=”false” padlinenumbers=”false” smarttabs=”true” tabsize=”4″ toolbar=”false”]-\u00a0(void)\u00a0createEditableCopyOfDatabaseIfNeeded
\n{
\n BOOL\u00a0success;
\n NSFileManager\u00a0*fileManager\u00a0=\u00a0[NSFileManager\u00a0defaultManager];
\n NSError\u00a0*error;
\n NSArray\u00a0*paths\u00a0=\u00a0NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask,\u00a0YES);
\n NSString\u00a0*documentsDirectory\u00a0=\u00a0[paths objectAtIndex:0];
\n NSString\u00a0*writableDBPath\u00a0=\u00a0[documentsDirectory stringByAppendingPathComponent:@"MyDB.sqlite"];
\n success\u00a0=\u00a0[fileManager fileExistsAtPath:writableDBPath];
\n if\u00a0(success)\u00a0return;
\n NSString\u00a0*defaultDBPath\u00a0=\u00a0[[[NSBundle\u00a0mainBundle]\u00a0resourcePath]\u00a0stringByAppendingPathComponent:@"MyDB.sqlite"];
\n success\u00a0=\u00a0[fileManager copyItemAtPath:defaultDBPath toPath:writableDBPath error:&amp;error];
\n if\u00a0(!success)\u00a0{
\n NSAssert1(0,\u00a0@"Failed to create writable database file with message ‘%@’.",\u00a0[error localizedDescription]);
\n }
\n}[\/code]<\/p>\n

It copy current .sqlite file in your device.<\/p>\n

Obviously,\u00a0you can load MyDB.sqlite only a once<\/em>, open it and mantain it opened until you completed operations, but this is a\u00a0stupid example<\/em>.<\/p>\n

How works Firefox SQLite Manager plugin<\/strong>?
\n\"SQLite
\nIt\u2019s a\u00a0simple GUI<\/em>\u00a0that is used to\u00a0create a DB, insert\/edit\/query values<\/em>.
\nYou need to\u00a0save db file and import in your project<\/em>.<\/p>\n

Happy coding!<\/strong><\/p>\n

Rif:\u00a0albertopasca.it<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Here a simple tutorial to use\u00a0SQLite in Objective-C\u00a0to make complex iphone|ipad applications that uses a\u00a0database! First of all, you\u00a0NEED\u00a0to\u00a0download Firefox, after that you need to download and install\u00a0SQLite Manager\u00a0Add On for Firefox\u00a0from here. The plugin will be used later\u2026<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[1],"tags":[167,355,356],"class_list":["post-293","post","type-post","status-publish","format-standard","hentry","category-generic","tag-objectivec","tag-sql","tag-sqlite"],"yoast_head":"\n[Objective-C] Use database with sql (lite) - while (true) {\u00a0}<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.albertopasca.it\/whiletrue\/objective-c-use-database-with-sql-lite\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Objective-C] Use database with sql (lite) - while (true) {\u00a0}\" \/>\n<meta property=\"og:description\" content=\"Here a simple tutorial to use\u00a0SQLite in Objective-C\u00a0to make complex iphone|ipad applications that uses a\u00a0database! 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