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iPhone 数据库（sqlite3）的用法操作

2013-06-04 22:39 369 查看
首先你在用之前要在项目中加入libsqlite3.dylib

1、定义模型

01
#import <Foundation/Foundation.h>  
02
#import "sqlite3.h"  
03
@
class

NotePad;  
04
@
class

NoteDb;  
05
@interface NoteSqlite : NSObject{  

06
    
sqlite3 *database;  
07
    
sqlite3_stmt *statement;  
08
    
char

*errorMsg;  
09
}  
10
//打开数据库  
11
-(
BOOL
)open;  
12
//创建青  
13
-(
BOOL
)create;  
14
   
 
15
//增加、删除、修改、查询  
16
-(
BOOL
)insert:(NotePad*)aNote;  
17
-(
BOOL
)deleteALLNote;  
18
-(
BOOL
)deleteaNote:(NotePad*)aNote;  
19
-(
BOOL
)update:(NotePad*)aNote;  
20
   
 
21
-(NoteDb*)selecteAll;  
22
-(NoteDb*)selectNotes:(NotePad*)aNote;  
23
   
 
24
@end
2、实现方法

查看源码

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001
#import "NoteSqlite.h"  

002
#import "NotePad.h"  
003
#import "NoteDb.h"  
004
@implementation NoteSqlite  
005
   
 
006
-(id)init{  
007
    
self=[super init];  
008
    
return

self;  
009
}  
010
//打开数据库  
011
-(
BOOL
)open{  
012
    
NSArray *paths= NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);  
013
    
NSString *documentsDirectory = [paths objectAtIndex:0];  
014
    
NSString *path = [documentsDirectory stringByAppendingPathComponent:@
"noteList.db"
];  
015
    
NSFileManager *fileManager = [NSFileManager defaultManager];  
016
    
BOOL

find = [fileManager fileExistsAtPath:path];  
017
    
//判断文件是否存在  
018
    
if

(find) {  
019
        
NSLog(@
"数据库文件已经存在"
);  
020
        
//打开数据库、返回操作是否正确  
021
        
if
(sqlite3_open([path UTF8String], &database) == SQLITE_OK) {  
022
            
NSLog(@
"打开成功数据库"
);  
023
        
}  
024
        
return

YES;  
025
    
}
else
{  
026
        
if
(sqlite3_open([path UTF8String], &database) == SQLITE_OK) {  
027
            
//调用createMusicList创建数据库和表  
028
            
[self create];               
029
            
return

YES;  
030
        
}
else
{  

031
            
sqlite3_close(database);  
032
            
NSLog(@
"Error: open database file."
);  
033
            
return

NO;  
034
        
}  
035
        
return

NO;  
036
    
}  

037
   
 
038
}  
039
//创建表  
040
-(
BOOL
)create{  
041
    
//创建表语句  
042
    
const

char
*createSql=
"create table if not exists note (id integer primary key autoincrement,theme text,information text,ndate text,priority integer)"
;   
043
    
//创建表是否成功  
044
    
if

(sqlite3_exec(database, createSql, NULL, NULL, &errorMsg)==SQLITE_OK) {         
045
        
NSLog(@
"create ok."
);     
046
        
return

YES;  
047
    
}
else
{  
048
        
//打印出错信息  
049
        
NSLog(@
"error: %s"
,errorMsg);   
050
        
sqlite3_free(errorMsg);  
051
    
}  

052
    
return

NO;  
053
   
 
054
}  
055
   
 
056
//增加、删除、修改、查询  
057
-(
BOOL
)insert:(NotePad*)aNote{  
058
    
//向表中插入记录    
059
    
//定义一个sql语句          
060
    
NSString *insertStatementNS = [NSString stringWithFormat:  
061
                                   
@"insert into \"note\"\  
062
                                   
(theme, information, ndate,priority)\  
063
                                   
values (\
"%@\", \"%@\", \"%@\",%d)"
,  
064
                                   
aNote.theme,aNote.information,[NSString stringWithFormat:@
"%@"
,aNote.ndate],aNote.priority  
065
                                    
];  
066
    
//将定义的NSString的sql语句，转换成UTF8的c风格的字符串  
067
    
const

char
*insertSql = [insertStatementNS UTF8String];  
068
    
//执行插入语句   
069
    
if

(sqlite3_exec(database, insertSql, NULL, NULL, &errorMsg)==SQLITE_OK) {    
070
        
NSLog(@
"insert ok."
);   
071
        
return

YES;  
072
    
}
else
{  
073
        
NSLog(@
"error: %s"
,errorMsg);   
074
        
sqlite3_free(errorMsg);  
075
    
}   

076
    
return

NO;  
077
   
 
078
}  
079
-(
BOOL
)deleteALLNote{  
080
    
//删除所有数据，条件为1>0永真  
081
    
const

char
*deleteAllSql=
"delete from note where 1>0"
;  
082
    
//执行删除语句  
083
    
if
(sqlite3_exec(database, deleteAllSql, NULL, NULL, &errorMsg)==SQLITE_OK){  
084
        
NSLog(@
"删除所有数据成功"
);  
085
    
}  

086
    
return

YES;  
087
}  
088
-(
BOOL
)deleteaNote:(NotePad*)aNote{  
089
    
//删除某条数据  
090
    
NSString *deleteString=[NSString stringWithFormat:@
"delete from note where id=%d"
,aNote.noteId];  
091
    
//转成utf-8的c的风格  
092
    
const

char
*deleteSql=[deleteString UTF8String];  
093
    
//执行删除语句  
094
    
if
(sqlite3_exec(database, deleteSql, NULL, NULL, &errorMsg)==SQLITE_OK){  
095
        
NSLog(@
"删除成功"
);  
096
    
}  

097
    
return

YES;  
098
}  
099
-(
BOOL
)update:(NotePad*)aNote{  
100
    
//更新语句  
101
    
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];  
102
   
// NSLog(@"%@",aNote);  
103
    
const

char
*updateSql=[updateString UTF8String];  
104
    
//执行更新语句  
105
    
if
(sqlite3_exec(database, updateSql, NULL, NULL, &errorMsg)==SQLITE_OK){  
106
        
NSLog(@
"更新成功"
);  
107
    
}     
108
    
return

YES;  
109
}  
110
   
 
111
-(NoteDb*)selecteAll{  
112
    
NoteDb *noteDb=[[[NoteDb alloc]init]autorelease];  
113
    
//查询所有语句  
114
    
const

char
*selectAllSql=
"select * from note"
;  
115
    
//执行查询  
116
    
if

(sqlite3_prepare_v2(database, selectAllSql, -1, &statement, nil)==SQLITE_OK) {  
117
        
NSLog(@
"select ok."
);    
118
        
//如果查询有语句就执行step来添加数据  
119
        
while

(sqlite3_step(statement)==SQLITE_ROW) {  
120
            
NotePad *note=[[NotePad alloc]init];  
121
               
 
122
            
int

noteid=sqlite3_column_int(statement, 0);  
123
            
NSMutableString *theme=[NSMutableString stringWithCString:(
char
*)sqlite3_column_text(statement, 1) encoding:NSUTF8StringEncoding];  
124
            
NSMutableString *information=[NSMutableString stringWithCString:(
char
*)sqlite3_column_text(statement, 2)
encoding:NSUTF8StringEncoding];  
125
            
NSString *ndateString=[NSString stringWithCString:(
char
*)sqlite3_column_text(statement, 3) encoding:NSUTF8StringEncoding];  
126
            
NSDateFormatter* formater = [[NSDateFormatter alloc] init];  
127
            
[formater setDateFormat:@
"yyyy-MM-dd HH:mm:ss"
];  
128
               
 
129
            
NSDate *ndate=[formater dateFromString:[ndateString substringToIndex:[ndateString length]-5]];  
130
           
// NSLog(@"%@",[ndateString substringToIndex:[ndateString length]-5]);  
131
            
[formater release];  
132
            
int

proriory=sqlite3_column_int(statement, 4);  
133
               
 
134
            
note.noteId=noteid;  
135
            
note.theme=theme;  
136
            
note.information=information;  
137
            
note.ndate=ndate;  
138
            
note.priority=proriory;  
139
            
[noteDb addNote:note];  
140
            
[note release];  
141
               
 
142
        
}  
143
        
return

noteDb;  
144
    
}  

145
    
return

noteDb;  
146
}  
147
-(NoteDb*)selectNotes:(NotePad*)aNote{  
148
    
NoteDb *noteDb=[[[NoteDb alloc]init]autorelease];  
149
    
NSString *selectNSSql=[NSString stringWithFormat:@
"select * from note where id=%i"
,aNote.noteId];  
150
    
//查询所有语句  
151
    
const

char
*selectSql=[selectNSSql UTF8String];  
152
    
//执行查询  
153
    
if

(sqlite3_prepare_v2(database, selectSql, -1, &statement, nil)==SQLITE_OK) {  
154
        
NSLog(@
"select ok."
);    
155
        
//如果查询有语句就执行step来添加数据  
156
        
while

(sqlite3_step(statement)==SQLITE_ROW) {  
157
            
NotePad *note=[[NotePad alloc]init];  
158
               
 
159
            
int

noteid=sqlite3_column_int(statement, 0);  
160
            
NSMutableString *theme=[NSMutableString stringWithCString:(
char
*)sqlite3_column_text(statement, 1) encoding:NSUTF8StringEncoding];  
161
            
NSMutableString *information=[NSMutableString stringWithCString:(
char
*)sqlite3_column_text(statement, 2)
encoding:NSUTF8StringEncoding];  
162
            
NSString *ndateString=[NSString stringWithCString:(
char
*)sqlite3_column_text(statement, 3) encoding:NSUTF8StringEncoding];  
163
            
NSDateFormatter* formater = [[NSDateFormatter alloc] init];  
164
            
[formater setDateFormat:@
"yyyy-MM-dd HH:mm:ss"
];  
165
               
 
166
            
NSDate *ndate=[formater dateFromString:[ndateString substringToIndex:[ndateString length]-5]];  
167
            
// NSLog(@"%@",[ndateString substringToIndex:[ndateString length]-5]);  
168
            
[formater release];  
169
            
int

proriory=sqlite3_column_int(statement, 4);  
170
               
 
171
            
note.noteId=noteid;  
172
            
note.theme=theme;  
173
            
note.information=information;  
174
            
note.ndate=ndate;  
175
            
note.priority=proriory;  
176
            
[noteDb addNote:note];  
177
            
[note release];  
178
               
 
179
        
}  
180
        
return

noteDb;  
181
    
}  

182
    
return

noteDb;  
183
}  
184
@end
转自：http://blog.csdn.net/rhljiayou/article/details/7615743
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