Iphone Sqlite 数据库的四大操作

首先引用libsqlite3.0.dylib库到Frameworks中,然后 加入#import <sqlite3.h>,就可以进行以下操作了!

实现

 

 #define insertGroup @"INSERT INTO tbl_Group (GroupName) VALUES ('%@')"
 #define deleteGroup @"DELETE from tbl_Group  WHERE  tbl_Group.GroupID=%d"
 #define updateGroupName @"UPDATE tbl_Group   SET GroupName = '%@'  WHERE GroupID = %d"
 #define selectGroup @"SELECT tbl_Group.GroupID, GroupName , count(tbl_GroupContact.GroupID) as GroupNumber FROM  tbl_Group LEFT JOIN tbl_GroupContact on tbl_Group.GroupID = tbl_GroupContact.GroupID Group By GroupName,tbl_Group.GroupID Order BY tbl_Group.GroupID DESC"
 @implementation SqliteOperation
 - (id)disconnect {
     sqlite3_close(database);
     return nil;
 }
 -(id) init
 {
     if((self = [super init]))
     {
         NSError **error;
         NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
         NSString *documentsDirectory = [paths objectAtIndex:0];
         NSString *dbPath = [documentsDirectory stringByAppendingPathComponent:@"/MultiMeeting.db"];
         NSFileManager *fileManager = [NSFileManager defaultManager];
         if(![fileManager fileExistsAtPath:dbPath])
         {
             // Copy the database from the package to the users filesystem
             [fileManager copyItemAtPath:pathDataBasePath toPath:dbPath error:error];
         }
         const char *dbPathChar = [dbPath UTF8String];
         if(sqlite3_open(dbPathChar,&database) == SQLITE_OK)
         {
             return self;
         }
         else
         {
             [self disconnect];
             return nil;
         }
     }
     return nil;
 }
 - (BOOL) NoneQueryWithSqlString:(NSString*) sqlString
 {
     const char *noneQuerySqlChar = [sqlString UTF8String];
     sqlite3_stmt *noneQueryStatement;
     if(sqlite3_prepare_v2(database,noneQuerySqlChar,-1,&noneQueryStatement,NULL) == SQLITE_OK)
     {
         int success = sqlite3_step(noneQueryStatement);
         if (success == SQLITE_DONE) {
             sqlite3_finalize(noneQueryStatement);
             return YES;
         }
         sqlite3_reset(noneQueryStatement);
     }
     sqlite3_finalize(noneQueryStatement);
     return NO;
 }
 //添加组
 -(BOOL) InsertGroup:(EntityGroup*)group
 {
     NSString *insertString = [NSString stringWithFormat:insertGroup,group.GroupName];
     BOOL result = [self NoneQueryWithSqlString:insertString];
     return result;
 }
 -(BOOL) DeleteGroup:(NSInteger) groupID
 {
     NSString *sqlStringForGroup = [NSString stringWithFormat:deleteGroup,groupID];
  return [self NoneQueryWithSqlString:sqlStringForGroup];
 }
 - (BOOL) ModifyGroupName:(EntityGroup*)group
 {
     NSString *sqlString = [NSString stringWithFormat:updateGroupName,group.GroupName,group.GroupID];
     return [self NoneQueryWithSqlString:sqlString];
 }
 //查询群组信息
 -(NSArray*) SelectGroup
 {
     sqlite3_stmt *statement;
     NSMutableArray *GroupArray = nil;
     NSString *sql = selectGroup;
     const char *sql_char = [sql UTF8String];

     if (database != nil) {
         if (sqlite3_prepare_v2(database, sql_char, -1, &statement, NULL) == SQLITE_OK)
         {
             while (sqlite3_step(statement) == SQLITE_ROW) {
                 if(GroupArray == nil)
                     GroupArray = [[NSMutableArray alloc] init];
                 EntityGroup *group = [[EntityGroup alloc] init];
                 group.GroupID = sqlite3_column_int(statement, 0);
                 group.GroupName = [NSString stringWithUTF8String:(char *)sqlite3_column_text(statement, 1)];
                 group.GroupNmuber = sqlite3_column_int(statement, 2);
                 [GroupArray addObject:group];
                 [group release];
             }
             if (GroupArray !=nil) {
                 sqlite3_finalize(statement);
                 [GroupArray autorelease];
                 return GroupArray;
             }
         }
         sqlite3_finalize(statement);
         return nil;
     }
     else {
         [self disconnect];
     }
     return nil;
 }
 - (void) dealloc
 {
     [self disconnect];
     [super dealloc];
 }
 @end