假设已经通过MySQLi扩展建立与数了据库的连接,连接对象是$mysqli。现在请写出代码,将连接的默认数据库设置为mydb。 A: $mysqli->set_db("mydb"); B: $mysqli.set_db("mydb"); C: $mysqli->select_db("mydb"); D: $mysqli.select_db("mydb");

采用 DAO 完成对"教学管理.mdb"文件中"学生表"的学生年龄都加 1 的操作,程序空白处应填写的语句是 Sub SetAgePlus() Dim ws As DAO.Workspace Dim db As DAO.Database Dim rs As DAO.Recordset Dim fd As DAO.Field Set db = CurrentDb() Set rs = db.OpenRecordset("学生表") Set fd = rs.Fields("年龄") Do While Not rs.EOF ___________ fd = fd + 1 rs.Update rs.MoveNext Loop rs.Close db.Close Set rs = Nothing Set db = Nothing End Sub

假设已经通过MySQLi扩展建立与数了据库的连接,连接对象是$mysqli。现在请写出代码,将连接的默认字符集设置为utf8。 A: $mysqli->query("SET NAMES ‘utf8’"); B: $mysqli.select_charset("utf8"); C: $mysqli->select_charset("utf8"); D: $mysqli.set_charset("utf8");

在学生选课数据库中，将所有选了课程‘DB’且分数在60~70分之间的学生的成绩增加百分之十，SQL语句为（ ） A: UPDATE SC SET Grade=Grade*1.1 WHERE Cno=’DB’ AND Grade BETWEEN 60 AND 70; B: UPDATE SC SET Grade+=Grade*0.1 WHERE Cno=(Select Cno From Course WHERE Cname=’DB’) AND Grade >= 60 AND Grade <=70; C: UPDATE SC SET Grade=Grade*1.1 WHERE Cno=(Select Cno From Course WHERE Cname=’DB’) AND Grade <= 60 AND Grade >=70; D: UPDATE SC SET Grade=Grade*1.1 WHERE Cno IN (Select Cno From Course WHERE Cname=’DB’) AND Grade BETWEEN 60 AND 70;

在学生选课数据库中，将所有选了课程‘DB’且分数在60~70分之间的学生的成绩增加百分之十，SQL语句为（ ） A: UPDATE SC SET Grade=Grade*1.1 WHERE Cno=’DB’ AND Grade BETWEEN 60 AND 70; B: UPDATE SC SET Grade+=Grade*0.1 WHERE Cno=(Select Cno From Course WHERE Cname=’DB’) AND Grade >= 60 AND Grade <=70; C: UPDATE SC SET Grade=Grade*1.1 WHERE Cno=(Select Cno From Course WHERE Cname=’DB’) AND Grade <= 60 AND Grade >=70; D: UPDATE SC SET Grade=Grade*1.1 WHERE Cno IN (Select Cno From Course WHERE Cname=’DB’) AND Grade BETWEEN 60 AND 70;

查看是否开启mysqli扩展，需要查看_____配置文件。

在下列php.ini的配置项中，哪一项可以开启MySQLi扩展（） A: extension=mysql B: extension=mysqli C: extension=pdo_mysql D: extension=oracle

下面( )函数从结果集中取得一行记录，返回的只是数字索引数组。 A: mysqli_query B: mysqli_fetch_array C: mysqli fetch row D: mysqli fetch assoc

某拟建企业厂界与界外居民楼测点背景噪声值为55dB()、53dB(),预测投产后两处测点的噪声贡献值分别为55dB()、53dB(),厂界和居民楼处噪声预测值分别为(A)。A.58 dB(A)、56 dB(A)B.55 dB(A)、53 dB(A)C.55 dB(A)、56 dB(A)D.58 dB(A)、53 dB(A) A: 58 dB(A)、56 dB(A) B: 55 dB(A)、53 dB(A) C: 55 dB(A)、56 dB(A) D: 58 dB(A)、53 dB(A)

The<br/>MYSQLi extensive library supports both process-oriented and<br/>object-oriented access to the MySQL database.( )