iphone数据库（sqlite3）的用法操作oc,xcode

首先你在用之前要在项目中加入libsqlite3.dylib

1、定义模型

[cpp] #import <Foundation/Foundation.h>

#import "sqlite3.h"

@class NotePad;

@class NoteDb;

@interface NoteSqlite : NSObject{

sqlite3 *database;

sqlite3_stmt *statement;

char *errorMsg;

}

//打开数据库

-(BOOL)open;

//创建青

-(BOOL)create;

//增加、删除、修改、查询

-(BOOL)insert:(NotePad*)aNote;

-(BOOL)deleteALLNote;

-(BOOL)deleteaNote:(NotePad*)aNote;

-(BOOL)update:(NotePad*)aNote;

-(NoteDb*)selecteAll;

-(NoteDb*)selectNotes:(NotePad*)aNote;

@end

#import <Foundation/Foundation.h>

#import "sqlite3.h"

@class NotePad;

@class NoteDb;

@interface NoteSqlite : NSObject{

sqlite3 *database;

sqlite3_stmt *statement;

char *errorMsg;

}

//打开数据库

-(BOOL)open;

//创建青

-(BOOL)create;

//增加、删除、修改、查询

-(BOOL)insert:(NotePad*)aNote;

-(BOOL)deleteALLNote;

-(BOOL)deleteaNote:(NotePad*)aNote;

-(BOOL)update:(NotePad*)aNote;

-(NoteDb*)selecteAll;

-(NoteDb*)selectNotes:(NotePad*)aNote;

@end

2、实现方法

[cpp] #import "NoteSqlite.h"

#import "NotePad.h"

#import "NoteDb.h"

@implementation NoteSqlite

-(id)init{

self=[super init];

return self;

}

//打开数据库

-(BOOL)open{

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

NSString *documentsDirectory = [paths objectAtIndex:0];

NSString *path = [documentsDirectory stringByAppendingPathComponent:@"noteList.db"];

NSFileManager *fileManager = [NSFileManager defaultManager];

BOOL find = [fileManager fileExistsAtPath:path];

//判断文件是否存在

if (find) {

NSLog(@"数据库文件已经存在");

//打开数据库、返回操作是否正确

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

NSLog(@"打开成功数据库");

}

return YES;

}else{

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

//调用createMusicList创建数据库和表

[self create];

return YES;

} else {

sqlite3_close(database);

NSLog(@"Error: open database file.");

return NO;

}

return NO;

}

}

//创建表

-(BOOL)create{

//创建表语句

const char *createSql="create table if not exists note (id integer primary key autoincrement,theme text,information text,ndate text,priority integer)";

//创建表是否成功

if (sqlite3_exec(database, createSql, NULL, NULL, &errorMsg)==SQLITE_OK) {

NSLog(@"create ok.");

return YES;

}else{

//打印出错信息

NSLog(@"error: %s",errorMsg);

sqlite3_free(errorMsg);

}

return NO;

}

//增加、删除、修改、查询

-(BOOL)insert:(NotePad*)aNote{

//向表中插入记录

//定义一个sql语句

NSString *insertStatementNS = [NSString stringWithFormat:

@"insert into \"note\"\

(theme, information, ndate,priority)\

values (\"%@\", \"%@\", \"%@\",%d)",

aNote.theme,aNote.information,[NSString stringWithFormat:@",aNote.priority]%@",aNote.ndate],aNote.priority

];

//将定义的NSString的sql语句，转换成UTF8的c风格的字符串

const char *insertSql = [insertStatementNS UTF8String];

//执行插入语句

if (sqlite3_exec(database, insertSql, NULL, NULL, &errorMsg)==SQLITE_OK) {

NSLog(@"insert ok.");

return YES;

}else{

NSLog(@"error: %s",errorMsg);

sqlite3_free(errorMsg);

}

return NO;

}

-(BOOL)deleteALLNote{

//删除所有数据，条件为1>0永真

const char *deleteAllSql="delete from note where 1>0";

//执行删除语句

if(sqlite3_exec(database, deleteAllSql, NULL, NULL, &errorMsg)==SQLITE_OK){

NSLog(@"删除所有数据成功");

}

return YES;

}

-(BOOL)deleteaNote:(NotePad*)aNote{

//删除某条数据

NSString *deleteString=[NSString stringWithFormat:@"delete from note where id=%d",aNote.noteId];

//转成utf-8的c的风格

const char *deleteSql=[deleteString UTF8String];

//执行删除语句

if(sqlite3_exec(database, deleteSql, NULL, NULL, &errorMsg)==SQLITE_OK){

NSLog(@"删除成功");

}

return YES;

}

-(BOOL)update:(NotePad*)aNote{

//更新语句

NSString *updateString=[NSString stringWithFormat:@"update note set
theme='%@', information='%@',
ndate='%@',priority=%d where id=%d",aNote.theme,aNote.information,aNote.ndate,aNote.priority,aNote.noteId];

// NSLog(@"%@",aNote);

const char *updateSql=[updateString UTF8String];

//执行更新语句

if(sqlite3_exec(database, updateSql, NULL, NULL, &errorMsg)==SQLITE_OK){

NSLog(@"更新成功");

}

return YES;

}

-(NoteDb*)selecteAll{

NoteDb *noteDb=[[[NoteDb alloc]init]autorelease];

//查询所有语句

const char *selectAllSql="select * from note";

//执行查询

if (sqlite3_prepare_v2(database, selectAllSql, -1, &statement, nil)==SQLITE_OK) {

NSLog(@"select ok.");

//如果查询有语句就执行step来添加数据

while (sqlite3_step(statement)==SQLITE_ROW) {

NotePad *note=[[NotePad alloc]init];

int noteid=sqlite3_column_int(statement, 0);

NSMutableString *theme=[NSMutableString stringWithCString:(char*)sqlite3_column_text(statement, 1) encoding:NSUTF8StringEncoding];

NSMutableString *information=[NSMutableString stringWithCString:(char*)sqlite3_column_text(statement, 2) encoding:NSUTF8StringEncoding];

NSString *ndateString=[NSString stringWithCString:(char*)sqlite3_column_text(statement, 3) encoding:NSUTF8StringEncoding];

NSDateFormatter* formater = [[NSDateFormatter alloc] init];

[formater setDateFormat:@"yyyy-MM-dd HH:mm:ss"];

NSDate *ndate=[formater dateFromString:[ndateString substringToIndex:[ndateString length]-5]];

// NSLog(@"%@",[ndateString substringToIndex:[ndateString length]-5]);

[formater release];

int proriory=sqlite3_column_int(statement, 4);

note.noteId=noteid;

note.theme=theme;

note.information=information;

note.ndate=ndate;

note.priority=proriory;

[noteDb addNote:note];

[note release];

}

return noteDb;

}

return noteDb;

}

-(NoteDb*)selectNotes:(NotePad*)aNote{

NoteDb *noteDb=[[[NoteDb alloc]init]autorelease];

NSString *selectNSSql=[NSString stringWithFormat:@"select * from note where id=%i",aNote.noteId];

//查询所有语句

const char *selectSql=[selectNSSql UTF8String];

//执行查询

if (sqlite3_prepare_v2(database, selectSql, -1, &statement, nil)==SQLITE_OK) {

NSLog(@"select ok.");

//如果查询有语句就执行step来添加数据

while (sqlite3_step(statement)==SQLITE_ROW) {

NotePad *note=[[NotePad alloc]init];

int noteid=sqlite3_column_int(statement, 0);

NSMutableString *theme=[NSMutableString stringWithCString:(char*)sqlite3_column_text(statement, 1) encoding:NSUTF8StringEncoding];

NSMutableString *information=[NSMutableString stringWithCString:(char*)sqlite3_column_text(statement, 2) encoding:NSUTF8StringEncoding];

NSString *ndateString=[NSString stringWithCString:(char*)sqlite3_column_text(statement, 3) encoding:NSUTF8StringEncoding];

NSDateFormatter* formater = [[NSDateFormatter alloc] init];

[formater setDateFormat:@"yyyy-MM-dd HH:mm:ss"];

NSDate *ndate=[formater dateFromString:[ndateString substringToIndex:[ndateString length]-5]];

// NSLog(@"%@",[ndateString substringToIndex:[ndateString length]-5]);

[formater release];

int proriory=sqlite3_column_int(statement, 4);

note.noteId=noteid;

note.theme=theme;

note.information=information;

note.ndate=ndate;

note.priority=proriory;

[noteDb addNote:note];

[note release];

}

return noteDb;

}

return noteDb;

}

@end

#import "NoteSqlite.h"

#import "NotePad.h"

#import "NoteDb.h"

@implementation NoteSqlite

-(id)init{

self=[super init];

return self;

}

//打开数据库

-(BOOL)open{

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

NSString *documentsDirectory = [paths objectAtIndex:0];

NSString *path = [documentsDirectory stringByAppendingPathComponent:@"noteList.db"];

NSFileManager *fileManager = [NSFileManager defaultManager];

BOOL find = [fileManager fileExistsAtPath:path];

//判断文件是否存在 www.2cto.com

if (find) {

NSLog(@"数据库文件已经存在");

//打开数据库、返回操作是否正确

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

NSLog(@"打开成功数据库");

}

return YES;

}else{

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

//调用createMusicList创建数据库和表

[self create];

return YES;

} else {

sqlite3_close(database);

NSLog(@"Error: open database file.");

return NO;

}

return NO;

}

}

//创建表

-(BOOL)create{

//创建表语句

const char *createSql="create table if not exists note (id integer primary key autoincrement,theme text,information text,ndate text,priority integer)";

//创建表是否成功

if (sqlite3_exec(database, createSql, NULL, NULL, &errorMsg)==SQLITE_OK) {

NSLog(@"create ok.");

return YES;

}else{

//打印出错信息

NSLog(@"error: %s",errorMsg);

sqlite3_free(errorMsg);

}

return NO;

}

//增加、删除、修改、查询

-(BOOL)insert:(NotePad*)aNote{

//向表中插入记录

//定义一个sql语句

NSString *insertStatementNS = [NSString stringWithFormat:

@"insert into \"note\"\

(theme, information, ndate,priority)\

values (\"%@\", \"%@\", \"%@\",%d)",

aNote.theme,aNote.information,[NSString stringWithFormat:@",aNote.priority]%@",aNote.ndate],aNote.priority

];

//将定义的NSString的sql语句，转换成UTF8的c风格的字符串

const char *insertSql = [insertStatementNS UTF8String];

//执行插入语句

if (sqlite3_exec(database, insertSql, NULL, NULL, &errorMsg)==SQLITE_OK) {

NSLog(@"insert ok.");

return YES;

}else{

NSLog(@"error: %s",errorMsg);

sqlite3_free(errorMsg);

}

return NO;

}

-(BOOL)deleteALLNote{

//删除所有数据，条件为1>0永真

const char *deleteAllSql="delete from note where 1>0";

//执行删除语句

if(sqlite3_exec(database, deleteAllSql, NULL, NULL, &errorMsg)==SQLITE_OK){

NSLog(@"删除所有数据成功");

}

return YES;

}

-(BOOL)deleteaNote:(NotePad*)aNote{

//删除某条数据

NSString *deleteString=[NSString stringWithFormat:@"delete from note where id=%d",aNote.noteId];

//转成utf-8的c的风格

const char *deleteSql=[deleteString UTF8String];

//执行删除语句

if(sqlite3_exec(database, deleteSql, NULL, NULL, &errorMsg)==SQLITE_OK){

NSLog(@"删除成功");

}

return YES;

}

-(BOOL)update:(NotePad*)aNote{

//更新语句

NSString *updateString=[NSString stringWithFormat:@"update note set
theme='%@', information='%@',
ndate='%@',priority=%d where id=%d",aNote.theme,aNote.information,aNote.ndate,aNote.priority,aNote.noteId];

// NSLog(@"%@",aNote);

const char *updateSql=[updateString UTF8String];

//执行更新语句

if(sqlite3_exec(database, updateSql, NULL, NULL, &errorMsg)==SQLITE_OK){

NSLog(@"更新成功");

}

return YES;

}

-(NoteDb*)selecteAll{

NoteDb *noteDb=[[[NoteDb alloc]init]autorelease];

//查询所有语句

const char *selectAllSql="select * from note";

//执行查询

if (sqlite3_prepare_v2(database, selectAllSql, -1, &statement, nil)==SQLITE_OK) {

NSLog(@"select ok.");

//如果查询有语句就执行step来添加数据

while (sqlite3_step(statement)==SQLITE_ROW) {

NotePad *note=[[NotePad alloc]init];

int noteid=sqlite3_column_int(statement, 0);

NSMutableString *theme=[NSMutableString stringWithCString:(char*)sqlite3_column_text(statement, 1) encoding:NSUTF8StringEncoding];

NSMutableString *information=[NSMutableString stringWithCString:(char*)sqlite3_column_text(statement, 2) encoding:NSUTF8StringEncoding];

NSString *ndateString=[NSString stringWithCString:(char*)sqlite3_column_text(statement, 3) encoding:NSUTF8StringEncoding];

NSDateFormatter* formater = [[NSDateFormatter alloc] init];

[formater setDateFormat:@"yyyy-MM-dd HH:mm:ss"];

NSDate *ndate=[formater dateFromString:[ndateString substringToIndex:[ndateString length]-5]];

// NSLog(@"%@",[ndateString substringToIndex:[ndateString length]-5]);

[formater release];

int proriory=sqlite3_column_int(statement, 4);

note.noteId=noteid;

note.theme=theme;

note.information=information;

note.ndate=ndate;

note.priority=proriory;

[noteDb addNote:note];

[note release];

}

return noteDb;

}

return noteDb;

}

-(NoteDb*)selectNotes:(NotePad*)aNote{

NoteDb *noteDb=[[[NoteDb alloc]init]autorelease];

NSString *selectNSSql=[NSString stringWithFormat:@"select * from note where id=%i",aNote.noteId];

//查询所有语句

const char *selectSql=[selectNSSql UTF8String];

//执行查询

if (sqlite3_prepare_v2(database, selectSql, -1, &statement, nil)==SQLITE_OK) {

NSLog(@"select ok.");

//如果查询有语句就执行step来添加数据

while (sqlite3_step(statement)==SQLITE_ROW) {

NotePad *note=[[NotePad alloc]init];

int noteid=sqlite3_column_int(statement, 0);

NSMutableString *theme=[NSMutableString stringWithCString:(char*)sqlite3_column_text(statement, 1) encoding:NSUTF8StringEncoding];

NSMutableString *information=[NSMutableString stringWithCString:(char*)sqlite3_column_text(statement, 2) encoding:NSUTF8StringEncoding];

NSString *ndateString=[NSString stringWithCString:(char*)sqlite3_column_text(statement, 3) encoding:NSUTF8StringEncoding];

NSDateFormatter* formater = [[NSDateFormatter alloc] init];

[formater setDateFormat:@"yyyy-MM-dd HH:mm:ss"];

NSDate *ndate=[formater dateFromString:[ndateString substringToIndex:[ndateString length]-5]];

// NSLog(@"%@",[ndateString substringToIndex:[ndateString length]-5]);

[formater release];

int proriory=sqlite3_column_int(statement, 4);

note.noteId=noteid;

note.theme=theme;

note.information=information;

note.ndate=ndate;

note.priority=proriory;

[noteDb addNote:note];

[note release];

}

return noteDb;

}

return noteDb;

}

@end