[英]My second table isn't being filled with data
Alright.. So I've made a small application which makes a connection to my database. 好吧..所以我做了一个小应用程序,它连接到我的数据库。 I can read out an excel file and store those files into an array.
我可以读出一个excel文件并将这些文件存储到一个数组中。 My database has multiple tables.
我的数据库有多个表。 I can fill in one table, but when I want to fill in the other table aswell, it won't work.
我可以填写一张桌子,但是当我想填写另一张桌子时,它也行不通。 I get a load of red lines in my stack trace and I can't figure out what to do.. So I came here desperately in hope of some help.
我的堆栈跟踪中出现了一堆红线,我无法弄清楚要做什么..所以我拼命地来到这里,希望得到一些帮助。
My program consists of a Main: 我的程序包含一个Main:
public static void main(String[] args){
CustomerMC cmc = new CustomerMC();
ArrayList<Customer> customers = new ArrayList<>();
ArrayList<Order> orders = new ArrayList<>();
ArrayList<ArrayList> gay = new ArrayList<>();
try {
try (FileInputStream file = new FileInputStream(new File("C:/Users/Wout/Desktop/ProjectTest.xlsx"))) {
XSSFWorkbook wb = new XSSFWorkbook(file);
XSSFSheet sh = wb.getSheetAt(0);
Iterator<Row> rowIterator = sh.iterator();
while(rowIterator.hasNext()) {
Row row = rowIterator.next();
Iterator<Cell> cellIterator = row.cellIterator();
int counter = 0;
int cid = 0;
int OrderID = 0;
String name = "";
String purchase = "";
String age = "";
String product = "";
while (cellIterator.hasNext() && row.getRowNum() != 0) {
Cell cell = cellIterator.next();
counter++;
switch (counter) {
case 1:
cid = (int)cell.getNumericCellValue();
break;
case 2:
name = cell.getStringCellValue();
break;
case 3:
purchase = cell.getStringCellValue();
break;
case 4:
age = "" + cell.getNumericCellValue();
break;
case 5:
OrderID = (int)cell.getNumericCellValue();
break;
case 6:
product = "" + cell.getStringCellValue();
break;
case 7:
cid = (int)cell.getNumericCellValue();
break;
}
}
if(row.getRowNum() != 0) {
Customer customer = new Customer(cid,name,purchase,age);
Order order = new Order(OrderID, product, cid);
customers.add(customer);
orders.add(order);
gay.add(customers);
gay.add(orders);
}
}
}
} catch (FileNotFoundException ex) {
System.out.println("File has not been found");
} catch (IOException ex) {
System.out.println("An error has occured");
}
for(Customer customer : customers){
for(Order order : orders) {
System.out.println(order.toString());
cmc.insertOrder(""+order.getOrderid(), order.getProduct(), ""+customer.getCid());
}
System.out.println(customer.toString());
cmc.insertCustomer(""+customer.getCid(), customer.getName(), customer.getPurchase(), customer.getAge());
}
}
Two container classes: 两个容器类:
public class Customer {
private int cid;
private String name;
private String purchase;
private String age;
public Customer(int cid, String name, String purchase, String age) {
this.cid = cid;
this.name = name;
this.purchase = purchase;
this.age = age;
}
public int getCid() {
return cid;
}
public void setCid(int cid) {
this.cid = cid;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPurchase() {
return purchase;
}
public void setPurchase(String purchase) {
this.purchase = purchase;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
@Override
public String toString() {
return "" + cid + " ; "+ name + " ; " + purchase + " ; " + age;
----------------------------------------------------------------------------
public class Order {
private int orderid;
private String product;
private int cid;
public Order(int orderid, String product, int cid) {
this.orderid = orderid;
this.product = product;
this.cid = cid;
}
public int getOrderid() {
return orderid;
}
public void setOrderid(int orderid) {
this.orderid = orderid;
}
public String getProduct() {
return product;
}
public void setProduct(String product) {
this.product = product;
}
public int getCid() {
return cid;
}
public void setCid(int cid) {
this.cid = cid;
}
@Override
public String toString() {
return "" + orderid + " ; " + product + " ; " + cid;
}
My model class customer with queries and such: 我的模型类客户有查询等:
public class CustomerMC {
private Connection connection;
private PreparedStatement pst;
String query;
ResultSet rs;
public CustomerMC(){
try{
connection = SimpleDataSourceV2.getConnection();
}
catch(SQLException e){
System.out.println("Connection failure");
e.printStackTrace();
}
}
public String insertCustomer(String cid, String name, String purchase, String age) {
String returning = null;
try {
query = "insert into CustomerService values(?,?,?,?);";
pst = connection.prepareStatement(query);
pst.setInt(1, Integer.parseInt(cid));
pst.setString(2, name);
pst.setString(3, purchase);
pst.setString(4, age);
int response = pst.executeUpdate();
returning = response +" Records has/have been edited";
} catch (SQLException e) {
returning = "An error has occured";
}
return returning;
}
public String insertOrder(String orderid, String product, String id) {
String returning = null;
try {
query = "insert into Order values(?,?,?);";
pst = connection.prepareStatement(query);
pst.setInt(1, Integer.parseInt(orderid));
pst.setString(2, product);
pst.setInt(3, Integer.parseInt(id));
int response = pst.executeUpdate();
returning = response +" Records has/have been edited";
} catch (SQLException e) {
System.out.println();
e.printStackTrace();
}
return returning;
}
The first class; 第一堂课; which is the customer table fills in perfectly fine.
这是客户表填写完全正常。 It prints out what it has to do.
它打印出它必须做的事情。 However, the order table, second one, doesn't.
但是,订单表,第二个,没有。 The output I get for that is as following:
我得到的输出如下:
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.Util.getInstance(Util.java:386)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1053)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4120)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4052)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2503)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2664)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2794)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2155)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2458)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2375)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2359)
at p4project.CustomerMC.insertOrder(CustomerMC.java:65)
at p4project.Main.main(Main.java:102)
com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'Order values(2,'Couch',1)' at line 1
I hope someone can help, any help is welcome. 我希望有人能提供帮助,欢迎任何帮助。
Sincerely, 此致
Double 双
com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax;
com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException:您的SQL语法中有错误; check the manual that corresponds to your MySQL server version for the right syntax to use near 'Order values(2,'Couch',1)' at line 1
检查与MySQL服务器版本对应的手册,以便在第1行的“订单值(2,'Couch',1)'附近使用正确的语法
Order is a reserved word for MySQL so instead you have to put the name of your table between `` like this: Order是MySQL的保留字,所以你必须把你的表名放在``喜欢这个:
query = "insert into `Order` values(?, ?, ?);";
//-------------------^-----^
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