"code note" Ios-fmdbdemo

Last Update:2017-07-27 Source: Internet

Author: User

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One.two, Engineering Drawings.three, Code.ViewController.h<pre><pre>#import <UIKit/UIKit.h>"FMDatabase.h""FMDatabaseQueue.h"@interface Viewcontroller:uiviewcontroller{fmdatabase *db; NSString *database_path;} @end </pre></pre>Viewcontroller.m<pre>#import"ViewController.h"#define DBNAME @ "personinfo.sqlite"#define ID @ "id"#define NAME @ "name"#define Age @ ' age '#define ADDRESS @ "address"#define TABLENAME @ "PERSONINFO"@interfaceViewcontroller ()@end@implementationviewcontroller-(void) Viewdidload {[super viewdidload];//Additional setup after loading the view, typically from a nib.//Initializing the database storage directory[self adddocumentpath];//Initializing the interface[self addview]; [super viewdidload];}#pragma-mark-functions//Initialize the database storage directory-(void) adddocumentpath{//Get documents directory Nsarray *paths =Nssearchpathfordirectoriesindomains (nsdocumentdirectory, nsuserdomainmask, YES); NSString *documents = [paths objectatindex:0]; NSLog (@"--documents--%@", documents);//Add/number to make it a complete path Database_path =[documents stringbyappendingpathcomponent:dbname]; NSLog (@"--database_path---%@", database_path); db =[fmdatabase databasewithpath:database_path];}//Initialize the user interface-(void) addview{//New Database UIButton *createbtn=[UIButton buttonwithtype:uibuttontyperoundedrect]; Createbtn.frame=cgrectmake (60,60,200,50); [CREATEBTN addtarget:self action: @selector (doclickcreatebutton) forcontrolevents:uicontroleventtouchupinside]; [CREATEBTN settitle:@"CreateTable"forstate:uicontrolstatenormal]; [self.view addsubview:createbtn];//Insert Database UIButton *insterbtn=[UIButton buttonwithtype:uibuttontyperoundedrect]; Insterbtn.frame=cgrectmake (60,130,200,50); [INSTERBTN addtarget:self action: @selector (doclickinsertbutton) forcontrolevents:uicontroleventtouchupinside]; [INSTERBTN settitle:@"Insert"forstate:uicontrolstatenormal]; [self.view addsubview:insterbtn];//Update Database UIButton *updatebtn=[UIButton buttonwithtype:uibuttontyperoundedrect]; Updatebtn.frame=cgrectmake (60,200,200,50); [UPDATEBTN addtarget:self action: @selector (doclickupdatebutton) forcontrolevents:uicontroleventtouchupinside]; [UPDATEBTN settitle:@"Update"forstate:uicontrolstatenormal]; [self.view addsubview:updatebtn];//Delete Database UIButton *deletebtn=[UIButton buttonwithtype:uibuttontyperoundedrect]; Deletebtn.frame=cgrectmake (60,270,200,50); [DELETEBTN addtarget:self action: @selector (doclickdeletebutton) forcontrolevents:uicontroleventtouchupinside]; [DELETEBTN settitle:@"Delete"forstate:uicontrolstatenormal]; [self.view addsubview:deletebtn];//View Database UIButton *selectbtn=[UIButton buttonwithtype:uibuttontyperoundedrect]; Selectbtn.frame=cgrectmake (60,340,200,50); [SELECTBTN addtarget:self action: @selector (doclickselectbutton) forcontrolevents:uicontroleventtouchupinside]; [SELECTBTN settitle:@"Select"forstate:uicontrolstatenormal]; [self.view addsubview:selectbtn];//Multithreading UIButton *multithreadbtn=[UIButton buttonwithtype:uibuttontyperoundedrect]; Multithreadbtn.frame=cgrectmake (60,410,200,50); [MULTITHREADBTN addtarget:self action: @selector (doclickmultithreadbutton) forcontrolevents: uicontroleventtouchupinside]; [MULTITHREADBTN settitle:@"Multithread"forstate:uicontrolstatenormal]; [self.view addsubview:multithreadbtn]; }#pragma-mark-doclickaction//New database-(void) doclickcreatebutton{//SQL statementsIf([db Open]) {nsstring *sqlcreatetable = [nsstring stringwithformat:@"CREATE TABLE IF not EXISTS '%@ ' ('%@ ' integer PRIMARY KEY autoincrement, '%@ ' text, '%@ ' integer, '%@ ' Text)", tablename,id,name,age,address]; BOOL res =[db executeupdate:sqlcreatetable];If (!Res) {NSLog (@"Error when creating DB table"); }Else{NSLog (@"Success to creating DB table"); } [db close]; }}//Insert database-(void) doclickinsertbutton{If([db Open]) {nsstring *insertsql1=[nsstring stringwithformat:@"INSERT into '%@ ' ('%@ ', '%@ ', '%@ ') VALUES ('%@ ', '%@ ', '%@ ')", TABLENAME, NAME, age, ADDRESS,@"Tom",@"13",@"Jinan"]; BOOL res =[db executeupdate:insertsql1];If (!Res) {NSLog (@"Error when insert DB table"); }Else{NSLog (@"Success to insert DB table"); } NSString *INSERTSQL2 =[nsstring stringwithformat:@"INSERT into '%@ ' ('%@ ', '%@ ', '%@ ') VALUES ('%@ ', '%@ ', '%@ ')", TABLENAME, NAME, age, ADDRESS,@"John doe",@"12",@"Jinan"]; BOOL res2 = [db executeupdate:insertsql2]; If (!res2) {NSLog (@ "error when insert db table");} Else{NSLog (@ "success to insert DB table");} [db close]; }}//modify database-(void) doclickupdatebutton{if ([db open]) {nsstring *updatesql = [nsstring stringwithformat: @ ' UPDATE '%@ ' SET '%@ ' = '%@ ' WHERE '%@ ' = '%@ ' ", TABLENAME, age, @" at age, @ "13"]; BOOL res = [db executeupdate:updatesql]; If (!res) {NSLog (@ "error when update db table"),} else {NSLog (@ "success to update DB table");} [db close]; }//delete database-(void) doclickdeletebutton{if ([db open]) {nsstring *deletesql = [nsstring stringwithformat: @ ' Delete from%@ where%@ = '%@ ' ", TABLENAME, NAME, @" Zhang San "]; BOOL res = [db executeupdate:deletesql]; If (!res) {NSLog (@ "error when delete db table"),} else {NSLog (@ "success to delete db table");} [db close]; }//view database-(void) doclickselectbutton{if ([db open]) {nsstring * sql = [nsstring stringwithformat: @ "select * from%@", TA blename]; Fmresultset * rs = [db executequery:sql]; While ([rs next]) {int Id = [rs intforcolumn:id]; NSString * name = [rs stringforcolumn:name]; NSString * age = [rs stringforcolumn:age]; NSString * address = [rs stringforcolumn:address]; NSLog (@ "id =%d, name =%@, age =%@ address =%@", id, name, age, address); } [db close]; }}//multithreaded Operations Database-(void) doclickmultithreadbutton{fmdatabasequeue * Queue = [fmdatabasequeue Databasequeuewithpath: database_path]; dispatch_queue_t q1 = dispatch_queue_create ("queue1", NULL); dispatch_queue_t q2 = dispatch_queue_create ("queue2", NULL); Dispatch_async (q1, ^{for (int i = 0; i <; ++i) {[queue indatabase:^ (fmdatabase *db2) {nsstring *insertsql1= [NSSt Ring Stringwithformat: @ "INSERT into '%@ ' ('%@ ', '%@ ', '%@ ') VALUES (?,?,?)", TABLENAME, NAME, age, ADDRESS]; NSString * name = [nsstring stringwithformat:@ "jack%d", i]; NSString * age = [nsstring stringwithformat:@ "%d", 10+i]; BOOL res = [db2 executeupdate:insertsql1, name, age,@ "jinan"]; If (!res) {NSLog (@ "error to Inster data:%@", name);} else {nsloG (@ "succ to Inster data:%@", name); } }]; } }); Dispatch_async (q2, ^{for (int i = 0; i <; ++i) {[queue indatabase:^ (fmdatabase *db2) {nsstring *insertsql2= [NSSt Ring Stringwithformat: @ "INSERT into '%@ ' ('%@ ', '%@ ', '%@ ') VALUES (?,?,?)", TABLENAME, NAME, age, ADDRESS]; NSString * name = [nsstring stringwithformat:@ "lilei%d", i]; NSString * age = [nsstring stringwithformat:@ "%d", 10+i]; BOOL res = [db2 executeupdate:insertsql2, name, age,@ "beijing"]; If (!res) {NSLog (@ "error to Inster data:%@", name), or else {NSLog (@ "succ to Inster data:%@", name);}]; } }); }-(void) didreceivememorywarning {[super Didreceivememorywarning];//Dispose of any of the resources that can be recreated.} @end</pre>"code note" Ios-fmdbdemo

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