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