PHP 中的 MySQL；我的脚本的奇怪行为
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【中文标题】PHP 中的 MySQL；我的脚本的奇怪行为【英文标题】：MySQL in PHP; strange behavior with my script 【发布时间】：2015-06-02 15:15:23 【问题描述】：我的数据库项目一直有问题。我正在使用 XAMPP（3.2.1 [编译：2013 年 5 月 7 日]）并使用 phpMyAdmin 在 localhost 上运行数据库。我在 ASUS X555L 上运行 64 位 Windows 8.1（如果这是有用的信息）。
我写了一个php脚本来加载数据库，但是遇到了麻烦。代码如下：
<html>
<head><title>Load KTCS Database</title></head>
<body>
<?php
/* Program: KTCS_load.php
* Desc: Creates and loads the KTCS database tables with
* sample data.
*/
$host = "localhost";
$user = "11cph2";
$password = "samplePassword";
$database = "ktcs";
$cxn = mysqli_connect($host,$user,$password, $database);
// Check connection
if (mysqli_connect_errno())
echo "Failed to connect to MySQL: " . mysqli_connect_error();
die();
mysqli_query($cxn,"drop table Car;");
mysqli_query($cxn,"drop table Member;");
mysqli_query($cxn,"drop table old_member;");
mysqli_query($cxn,"drop table Reservations;");
mysqli_query($cxn,"drop table Pick_Up;");
mysqli_query($cxn,"drop table Rental_History;");
mysqli_query($cxn,"drop table Locations;");
mysqli_query($cxn,"drop table Fee;");
mysqli_query($cxn,"drop table Comment;");
mysqli_query($cxn,"drop table Reply;");
mysqli_query($cxn,"drop table Administrator;");
mysqli_query($cxn,"drop table Member_Password;");
mysqli_query($cxn,"drop table Admin_Password;");
mysqli_query($cxn,"CREATE TABLE Car(
VIN CHAR(10) NOT NULL,
make VARCHAR(15) NOT NULL,
model VARCHAR(15) NOT NULL,
year CHAR(4) NOT NULL,
type CHAR(3) NOT NULL,
LAddress VARCHAR(40) NOT NULL,
status CHAR(20) NOT NULL,
LastOMRead CHAR(6),
LastGasRead CHAR(2),
LastMaintOMRead CHAR(6),
LastMaintGasRead CHAR(2),
PRIMARY KEY(VIN));");
mysqli_query($cxn,"CREATE TABLE Member(
MNo CHAR(10) NOT NULL,
MName VARCHAR(15) NOT NULL,
MAddress VARCHAR(60) NOT NULL,
MPhoneNo CHAR(10),
MEmail VARCHAR(30),
DLicenseNo CHAR(15) NOT NULL,
CCardNo CHAR(16) NOT NULL,
CCardExpDate CHAR(5) NOT NULL,
RegAnnivDate DATE NOT NULL,
PRIMARY KEY(MNo));");
mysqli_query($cxn,"CREATE TABLE old_member(
MNo CHAR(10) NOT NULL,
MName VARCHAR(15) NOT NULL,
MAddress VARCHAR(40) NOT NULL,
MPhoneNo CHAR(11),
MEmail VARCHAR(30),
PRIMARY KEY(MNo));");
mysqli_query($cxn,"CREATE TABLE Reservations(
ResNo CHAR(10) NOT NULL,
MNo CHAR(10) NOT NULL,
VIN CHAR(10) NOT NULL,
ResDate DATE NOT NULL,
ResTime CHAR(5) NOT NULL,
PickUpAddress VARCHAR(40) NOT NULL,
PRIMARY KEY(ResNo),
FOREIGN KEY (MNo) REFERENCES Member(MNo),
FOREIGN KEY (VIN) REFERENCES Car (VIN));");
mysqli_query($cxn,"CREATE TABLE pick_up(
ResNo CHAR(10) NOT NULL,
MNo CHAR(10) NOT NULL,
VIN CHAR(10) NOT NULL,
ResDate DATE NOT NULL,
ResTime CHAR(5) NOT NULL,
PickUpDate DATE NOT NULL,
PickUpTime CHAR(5) NOT NULL,
PickUpAddress VARCHAR(40) NOT NULL,
PUpOMRead CHAR(6) NOT NULL,
PRIMARY KEY(ResNo),
FOREIGN KEY (MNo) REFERENCES Member(MNo),
FOREIGN KEY (VIN) REFERENCES Car (VIN));");
mysqli_query($cxn,"CREATE TABLE Rental_History(
ResNo CHAR(10) NOT NULL,
MNo CHAR(10) NOT NULL,
VIN CHAR(10) NOT NULL,
PickUpDate DATE NOT NULL,
PickUpTime CHAR(5) NOT NULL,
ReturnDate DATE NOT NULL,
ReturnTime CHAR(5) NOT NULL,
PickUpAddress VARCHAR(40) NOT NULL,
RetAddress VARCHAR(40) NOT NULL,
PUpOMRead CHAR(6) NOT NULL,
RetOMRead CHAR(6) NOT NULL,
PRIMARY KEY(ResNo),
FOREIGN KEY (MNo) REFERENCES Member(MNo),
FOREIGN KEY (VIN) REFERENCES Car (VIN));");
mysqli_query($cxn,"CREATE TABLE Locations(
LAddress VARCHAR(40) NOT NULL,
NoAvailSpaces INTEGER NOT NULL,
PRIMARY KEY(LAddress));");
mysqli_query($cxn,"CREATE TABLE Fee(
MNo CHAR(10) NOT NULL,
AnnualMemFee DECIMAL(5,2) NOT NULL,
UsageFee DECIMAL(5,2),
PRIMARY KEY (MNo),
FOREIGN KEY (MNo) REFERENCES Member(MNo));");
mysqli_query($cxn,"CREATE TABLE Comment(
MNo CHAR(10) NOT NULL,
Date DATE NOT NULL,
Time CHAR(5) NOT NULL,
Topic CHAR(7) NOT NULL,
Comment VARCHAR(300) NOT NULL,
Reply VARCHAR(300) NOT NULL,
PRIMARY KEY(MNo, Date, Time),
FOREIGN KEY (MNo) REFERENCES Member(MNo));");
mysqli_query($cxn,"CREATE TABLE Reply(
ENo CHAR(10) NOT NULL,
ReplyDate DATE NOT NULL,
ReplyTime CHAR(5) NOT NULL,
MNo CHAR(10) NOT NULL,
Date DATE NOT NULL,
Time CHAR(5) NOT NULL,
Reply VARCHAR(300) NOT NULL,
PRIMARY KEY(ENo, ReplyDate, ReplyTime, MNo, Date, Time),
FOREIGN KEY (MNo) REFERENCES Member(MNo),
FOREIGN KEY (ENo) REFERENCES Administrator(ENo));");
mysqli_query($cxn,"CREATE TABLE Administrator(
ENo CHAR(10) NOT NULL,
EName VARCHAR(15) NOT NULL,
EAddress VARCHAR(60) NOT NULL,
EPhoneNo CHAR(10) NOT NULL,
EEmail VARCHAR(30) NOT NULL,
SIN CHAR(9) NOT NULL,
Salary INTEGER NOT NULL,
PRIMARY KEY(ENo));");
mysqli_query($cxn,"CREATE TABLE Member_Password(
MNo CHAR(10) NOT NULL,
MPassword VARCHAR(20) NOT NULL,
PRIMARY KEY(MNo),
FOREIGN KEY (MNo) REFERENCES Member(MNo));");
mysqli_query($cxn,"CREATE TABLE Admin_Password(
ENo CHAR(10) NOT NULL,
EPassword VARCHAR(20) NOT NULL,
PRIMARY KEY(ENo),
FOREIGN KEY (ENo) REFERENCES Administrator(ENo));");
mysqli_query($cxn,"insert into Car values
('0000000050', 'Toyota', 'Corolla', 'Car', '2003', '240 Princess Street, Kingston', 'in-use', '2015007', '54','185064', '66'),
('0000000051', 'Toyota', 'Corolla', 'Car', '2003', '240 Princess Street, Kingston', 'in-use', '2015007', '54','185064', '66'),
('0000000052', 'Toyota', 'Corolla', 'Car', '2003', '240 Princess Street, Kingston', 'available', '2015007', '54','185064', '66'),
('0000000053', 'Toyota', 'Corolla', 'Car', '2003', '240 Princess Street, Kingston', 'out-for-maintenance', '2015007', '54','185064', '66'),
('0000000054', 'Toyota', 'Corolla', 'Car', '2003', '240 Princess Street, Kingston', 'in-use', '2015007', '54','185064', '66'),
('0000000055', 'Toyota', 'Corolla', 'Car', '2003', '240 Princess Street, Kingston', 'available', '2015007', '54','185064', '66'),
('0000000056', 'Toyota', 'Corolla', 'Car', '2003', '240 Princess Street, Kingston', 'in-use', '2015007', '54','185064', '66'),
('0000000057', 'Toyota', 'Corolla', 'Car', '2003', '240 Princess Street, Kingston', 'out-for-maintenance', '2015007', '54','185064', '66'),
('0000000058', 'Toyota', 'Corolla', 'Car', '2003', '240 Princess Street, Kingston', 'in-use', '2015007', '54','185064', '66'),
('0000000059', 'Toyota', 'Corolla', 'Car', '2003', '240 Princess Street, Kingston', 'in-use', '2015007', '54','185064', '66'),
('0000000010', 'Hyundai', 'Accent Sedan', 'Van', '2007', '427 king Street, Kingston, ON', 'available', '079430', '33','022542', '27'),
('0000000011', 'Hyundai', 'Accent Sedan', 'Van', '2007', '427 king Street, Kingston, ON', 'available', '079430', '33','022542', '27'),
('0000000012', 'Hyundai', 'Accent Sedan', 'Van', '2007', '427 king Street, Kingston, ON', 'out-for-maintenance', '079430', '33','022542', '27'),
('0000000013', 'Hyundai', 'Accent Sedan', 'Van', '2007', '427 king Street, Kingston, ON', 'available', '079430', '33','022542', '27'),
('0000000014', 'Hyundai', 'Accent Sedan', 'Van', '2007', '427 king Street, Kingston, ON', 'out-for-maintenance', '079430', '33','022542', '27'),
('0000000015', 'Hyundai', 'Accent Sedan', 'Van', '2007', '427 king Street, Kingston, ON', 'available', '079430', '33','022542', '27'),
('0000000016', 'Hyundai', 'Accent Sedan', 'Van', '2007', '427 king Street, Kingston, ON', 'available', '079430', '33','022542', '27'),
('0000000017', 'Hyundai', 'Accent Sedan', 'Van', '2007', '427 king Street, Kingston, ON', 'in-use', '079430', '33','022542', '27'),
('0000000018', 'Hyundai', 'Accent Sedan', 'Van', '2007', '427 king Street, Kingston, ON', 'in-use', '079430', '33','022542', '27'),
('0000000019', 'Hyundai', 'Accent Sedan', 'Van', '2007', '427 king Street, Kingston, ON', 'available', '079430', '33','022542', '27'),
('0000000060', 'KIA', 'Sorento', 'Van', '2004', '240 Princess Street, Kingston', 'in-use', '071900', '12','065405', '50'),
('0000000061', 'KIA', 'Sorento', 'Van', '2004', '240 Princess Street, Kingston', 'available', '071900', '12','065405', '50'),
('0000000062', 'KIA', 'Sorento', 'Van', '2004', '240 Princess Street, Kingston', 'in-use', '071900', '12','065405', '50'),
('0000000063', 'KIA', 'Sorento', 'Van', '2004', '240 Princess Street, Kingston', 'in-use', '071900', '12','065405', '50'),
('0000000064', 'KIA', 'Sorento', 'Van', '2004', '240 Princess Street, Kingston', 'out-for-maintenance', '071900', '12','065405', '50'),
('0000000065', 'KIA', 'Sorento', 'Van', '2004', '240 Princess Street, Kingston', 'in-use', '071900', '12','065405', '50'),
('0000000066', 'KIA', 'Sorento', 'Van', '2004', '240 Princess Street, Kingston', 'available', '071900', '12','065405', '50'),
('0000000067', 'KIA', 'Sorento', 'Van', '2004', '240 Princess Street, Kingston', 'in-use', '071900', '12','065405', '50'),
('0000000068', 'KIA', 'Sorento', 'Van', '2004', '240 Princess Street, Kingston', 'in-use', '071900', '12','065405', '50'),
('0000000069', 'KIA', 'Sorento', 'Van', '2004', '240 Princess Street, Kingston', 'available', '071900', '12','065405', '50'),
('0000000030', 'Honda', 'Civic', 'Car', '2004', '746 Gardiners Road, Kingston, ON', 'out-for-maintenance', '160547', '27','120548', '38'),
('0000000031', 'Honda', 'Civic', 'Car', '2004', '746 Gardiners Road, Kingston, ON', 'available', '160547', '27','120548', '38'),
('0000000032', 'Honda', 'Civic', 'Car', '2004', '746 Gardiners Road, Kingston, ON', 'available', '160547', '27','120548', '38'),
('0000000033', 'Honda', 'Civic', 'Car', '2004', '746 Gardiners Road, Kingston, ON', 'in-use', '160547', '27','120548', '38'),
('0000000034', 'Honda', 'Civic', 'Car', '2004', '746 Gardiners Road, Kingston, ON', 'available', '160547', '27','120548', '38'),
('0000000035', 'Honda', 'Civic', 'Car', '2004', '746 Gardiners Road, Kingston, ON', 'available', '160547', '27','120548', '38'),
('0000000036', 'Honda', 'Civic', 'Car', '2004', '746 Gardiners Road, Kingston, ON', 'in-use', '160547', '27','120548', '38'),
('0000000037', 'Honda', 'Civic', 'Car', '2004', '746 Gardiners Road, Kingston, ON', 'in-use', '160547', '27','120548', '38'),
('0000000038', 'Honda', 'Civic', 'Car', '2004', '746 Gardiners Road, Kingston, ON', 'available', '160547', '27','120548', '38'),
('0000000039', 'Honda', 'Civic', 'Car', '2004', '746 Gardiners Road, Kingston, ON', 'available', '160547', '27','120548', '38');");
mysqli_query($cxn,"insert into Member values
('0000000001', 'Johnny Graph', '25 Collingwood Street, Kingston, ON', null, null, 'H1479681425432', '4560792363707025', '12/15', '2015-06-12'),
('0000000002', 'Brian Moore', '246 Albert Street, Kingston, ON', '6134829215', 'brianmoorecsqueensuca', 'F61374545461262', '3460602855077016', '03/17', '2015-10-06'),
('0000000003', 'Aaron Abbey', '38 Sydenham Street, Kingston, ON', null, null, 'E94384541504362', '7148061363696900', '09/18', '2015-03-27'),
('0000000004', 'Annie Wang', '1060 Woodbine Road, Kingston, ON', '6135579438', null, 'H14682024658751', '4590286617636329', '01/16', '2016-01-19');");
mysqli_query($cxn,"insert into Reservations values
('0000000020', '0000000001', '0000000037', '2015-06-10', '11:00', '240 Princess Street, Kingston, ON'),
('0000000068', '0000000002', '0000000050', '2015-04-05', '10:30', '185 Bath Road, Kingston, ON'),
('0000000076', '0000000001', '0000000036', '2015-04-09', '09:30', '427 king Street, Kingston, ON'),
('0000000098', '0000000004', '0000000057', '2015-05-14', '10:00', '240 Princess Street, Kingston, ON'),
('0000000104', '0000000004', '0000000013', '2015-08-23', '17:00', '185 Bath Road, Kingston, ON'),
('0000000130', '0000000001', '0000000065', '2015-07-06', '12:30', '240 Princess Street, Kingston, ON'),
('0000000147', '0000000003', '0000000055', '2015-04-17', '15:00', '240 Princess Street, Kingston, ON');");
mysqli_close($cxn);
echo "KTCS database created.";
?>
</body></html>
这是我的 ER 图的链接。抱歉，如果我遗漏了很多事情或逻辑错误。我对此很陌生。
ER Diagram
以下是我的问题列表：
有时我在向表中添加值时遇到问题。
当我注释掉所有“创建表”和“添加值”代码（也就是只剩下“删除表”）时，我无法一次性删除所有表（需要运行脚本两次）。会不会是外键约束？
当我让整个数据库为空（没有表）并且只包含“删除表”和“创建表”代码时，并非所有表都一次添加到数据库中。仅当我第二次运行脚本时才会添加表“回复”。这是为什么呢？
现在我已成功将所有值添加到数据库中，但在继续之前，我只想清除程序的所有这些奇怪行为。我不知道是什么原因造成的，但可能与外键有关。
不一致的行为真的很令人沮丧，因为我花了很长时间检查数据类型和语法错误。很多时候语法是完美的，但我只需要再运行几次脚本才能显示表格，或者在尝试加载表格之前删除所有表格。
任何帮助都会很棒。
【问题讨论】：
【参考方案1】：为了更好地删除和创建表
DROP TABLE IF EXIST
CREATE TABLE IF NOT EXIST
【讨论】：
我试过DROP TABLE IF EXIST table_name;和CREATE TABLE IF NOT EXIST table_name (...)；但它似乎没有运行.. 它应该是正确的，根据drop table 和create table。所以我真的不知道.. 但无论如何，我发现我创建和删除表格的顺序也很重要。我将具有外键的表放在删除表代码的末尾，并将它们放在创建表代码的开头。它似乎有效。以上是关于PHP 中的 MySQL；我的脚本的奇怪行为的主要内容，如果未能解决你的问题，请参考以下文章