I have create a database class and packaged some methods. However, once build the project...

Undefined symbols for architecture i386:
"_sqlite3_open", referenced from:
  -[MyDataBase openOrCreateDatabase:] in MyDataBase.o
"_sqlite3_exec", referenced from:
  -[MyDataBase createTable:] in MyDataBase.o
  -[MyDataBase InsertTable:] in MyDataBase.o
  -[MyDataBase UpdataTable:] in MyDataBase.o
  -[MyDataBase querryTableByCallBack:] in MyDataBase.o
"_sqlite3_close", referenced from:
  -[MyDataBase closeDatabase] in MyDataBase.o
"_sqlite3_get_table", referenced from:
  -[MyDataBase querryTable:] in MyDataBase.o
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)

here are some critical methods:

create the database: 

-(BOOL)openOrCreateDatabase:(NSString*)dbName 
{ 
self.m_dbName = dbName; 
NSArray *path =NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,   YES); 
NSString *documentsDirectory = [path objectAtIndex:0]; 
if(sqlite3_open([[documentsDirectory stringByAppendingPathComponent:dbName]   UTF8String],&m_sql) !=SQLITE_OK) 
{ 
NSLog(@"创建数据库失败"); 
return NO; 
} 
return YES; 
}

create tables:

-(BOOL)createTable:(NSString*)sqlCreateTable  
{  
if (![self openOrCreateDatabase:self.m_dbName]) {  
    return NO;  
}  
char *errorMsg;  
if (sqlite3_exec (self.m_sql, [sqlCreateTable UTF8String],NULL, NULL, &errorMsg) != 
SQLITE_OK)  
{  
    NSLog(@"创建数据表失败:%s",errorMsg);  
    return NO;  
}  
[self closeDatabase];  
return YES;  
}

close the database:

-(void)closeDatabase  
{  
sqlite3_close(self.m_sql);   
}  

//insert  

-(BOOL)InsertTable:(NSString*)sqlInsert  
{  
if (![self openOrCreateDatabase:self.m_dbName]) {  
    return NO;  
}  
char* errorMsg = NULL;  
if(sqlite3_exec(self.m_sql, [sqlInsert UTF8String],0, NULL, &errorMsg) ==S
ios database
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