+(NSArray *)findAll{
sqlite3 * db = [DB DBOpen]; //调用DB open方法 获取数据库指针 sqlite3_stmt * stmt;//镜像 copy出来的镜像 不影响sqlite里的内容 int result = sqlite3_prepare_v2(db, "select * from student", -1, &stmt, Nil); //-1是不限制字符串的长度 &stmt是往stmt里面赋值 Const char **pzTail是设置前面哪个是不用的 NSMutableArray * peopels = [NSMutableArray array]; //制作容器 要装数据 //判断结果 0进判断 result==0表示正确 if (SQLITE_OK == result) { //判断是否有下一行 while (sqlite3_step(stmt) == SQLITE_ROW) { //int iCol 是第几个 int stuId = sqlite3_column_int(stmt, 0); //取一行中的一个 int是值的类型 const unsigned charchar * stuName = sqlite3_column_text(stmt, 1); //取一行中的一个 text是值的类型 const unsigned charchar * stuSex = sqlite3_column_text(stmt, 2); //取一行中的一个 text是值的类型 float stuScore = sqlite3_column_double(stmt, 3); //取一行中的一个 double是值的类型 //转换 NSString * currentName = [NSString stringWithUTF8String:(const charchar *)stuName]; NSString * currentSex = [NSString stringWithUTF8String:(const charchar *)stuSex]; StudentModel * student = [StudentModel studentModelWithId:stuId name:currentName sex:currentSex score:stuScore]; //将model中内容 添加到 之前的容器 数组 [peopels addObject:student]; } sqlite3_finalize(stmt);//关闭镜像 return peopels;//将这个装有数据的数组 返回 }else{ sqlite3_finalize(stmt); return [NSArray array]; //如果没进入if 返回一个空数组 } } //查找单个数据 +(StudentModel *)findPeopleWith:(NSInteger )stuId{ sqlite3 * db = [DB DBOpen]; sqlite3_stmt * stmt; int result = sqlite3_prepare_v2(db, "select stuName,stuId,stuSex,stuScore from student where stuId=?", -1, &stmt, Nil); sqlite3_bind_int(stmt, 1, stuId);// 第一个int是第几个问好？ 第二个int 是绑定的内容 绑定问好 if (SQLITE_OK == result) { if (sqlite3_step(stmt) == SQLITE_ROW) { const unsigned charchar * stuName = sqlite3_column_text(stmt, 0); int stuId = sqlite3_column_int(stmt, 1); const unsigned charchar * stuSex = sqlite3_column_text(stmt, 2); float stuScore = sqlite3_column_double(stmt, 3); NSString * currentName = [NSString stringWithUTF8String:(const charchar *)stuName]; NSString * currentSex = [NSString stringWithUTF8String:(const charchar *)stuSex]; StudentModel * student = [StudentModel studentModelWithId:stuId name:currentName sex:currentSex score:stuScore]; sqlite3_finalize(stmt); NSLog(@"000"); return student; }else{ NSLog(@"11111"); return nil; } }else{ NSLog(@"222222"); sqlite3_finalize(stmt); return nil; } } //插入数据 +(void)insertIntoModel:(StudentModel *)model{ sqlite3 * db = [DB DBOpen]; sqlite3_stmt * stmt; int result = sqlite3_prepare_v2(db, "insert into student values(?,?,?,?)", -1, &stmt, Nil); sqlite3_bind_int(stmt, 1, model.stuId); sqlite3_bind_text(stmt, 2, [model.stuName UTF8String], -1, Nil); sqlite3_bind_text(stmt, 3, [model.stuSex UTF8String], -1, nil); sqlite3_bind_double(stmt, 4, model.stuScore); if (SQLITE_OK == result) { if (sqlite3_step(stmt) == SQLITE_DONE) { NSLog(@"添加成功"); sqlite3_finalize(stmt); return; }else{ NSLog(@"添加失败"); sqlite3_finalize(stmt); return; } }else{ NSLog(@"111"); sqlite3_finalize(stmt); return; } } //更新数据 +(void)updateStuName:(NSString *)name stuSex:(NSString *)sex stuScore:(CGFloat)score stuId:(NSInteger)stuid{ sqlite3 * db = [DB DBOpen]; sqlite3_stmt * stmt; int result = sqlite3_prepare_v2(db, "update student set stuName=?,stuSex=?,stuScore=? where stuId = ?", -1, &stmt, Nil); sqlite3_bind_int(stmt, 4, stuid); sqlite3_bind_text(stmt, 1, [name UTF8String], -1, Nil); sqlite3_bind_text(stmt, 2, [sex UTF8String], -1, nil); sqlite3_bind_double(stmt, 3, score); if (SQLITE_OK == result) { if (sqlite3_step(stmt) == SQLITE_DONE) { NSLog(@"更新成功"); sqlite3_finalize(stmt); return; }else{ NSLog(@"更新失败"); sqlite3_finalize(stmt); } }else{ NSLog(@"shibai"); sqlite3_finalize(stmt); } } //删除数据 +(void)deleteModelStuId:(NSInteger)stuid{ sqlite3 * db = [DB DBOpen]; sqlite3_stmt * stmt; int relust = sqlite3_prepare_v2(db, "delete from student where stuid= ?", -1, &stmt, nil); sqlite3_bind_int(stmt, 1, stuid); if (SQLITE_OK == relust) { //step 截段 if (sqlite3_step(stmt) == SQLITE_DONE) { NSLog(@"删除成功"); sqlite3_finalize(stmt); return; }else{ NSLog(@"删除失败"); sqlite3_finalize(stmt); return; } }else{ NSLog(@"删除失败11"); sqlite3_finalize(stmt); return; } } @end 原文：http://www.cnblogs.com/ooo1/p/5333887.html