Question

我遇到了这个问题INSERT on table＆＃39; PURCHASEDETAILS＆＃39;导致违反外键约束＆＃39; SQL141108214008671＆＃39; SQL141108214008671＆＃39;用于键（P0003）。声明已经回滚。我似乎无法找到问题。

  CREATE TABLE STOCKS (
    stockID VARCHAR(5) not null,
    stockName VARCHAR(50),
    stockPrice DOUBLE,

stockDescrp VARCHAR(100),
stockQty INTEGER,
PRIMARY KEY (stockID)
);

INSERT INTO STOCKS VALUES ('S0001', 'Vitamin C For Kids', 12.90, 'Vitamin C for kids under age of 8.', 100);
INSERT INTO STOCKS VALUES ('S0002', 'Syntha-6 Whey Protein', 180.00,'Ultra lean muscle protein for healthy adults over 18 years old.', 100);
INSERT INTO STOCKS VALUES ('S0003', 'Serious Mass', 190.00,'Extra calories that allows anyone to increase mass efficiently.', 100);
INSERT INTO STOCKS VALUES ('S0004', 'Vitamin C Elite', 15.50, 'Vitamin C for everyone.', 100);

CREATE TABLE PURCHASE (
     purchaseID VARCHAR(5) not null,
     purchaseDate DATE,
     memberID VARCHAR(5),
     PRIMARY KEY (purchaseID),
     FOREIGN KEY (memberID) REFERENCES MEMBERS(memberID)
);

INSERT INTO PURCHASE VALUES ('P0001','2014-10-23','S0001');
INSERT INTO PURCHASE VALUES ('P0002','2014-10-23','G0001');

CREATE TABLE PURCHASEDETAILS (
    purchaseDetailID VARCHAR(7) not null,
    purchaseID VARCHAR(5),
    stockID VARCHAR(5),
    OrderQty INTEGER,
    PRIMARY KEY (purchaseDetailID),
    FOREIGN KEY (purchaseID) REFERENCES PURCHASE(purchaseID),
    FOREIGN KEY (stockID) REFERENCES STOCKS(stockID)
);

INSERT INTO PURCHASEDETAILS VALUES ('PD00001', 'P0001', 'S0001', 4);
INSERT INTO PURCHASEDETAILS VALUES ('PD00002', 'P0001', 'S0002', 10);
INSERT INTO PURCHASEDETAILS VALUES ('PD00003', 'P0002', 'S0003', 5);

这里是插入记录的DA部分：

 public void insertRecord(Purchase purc){

    String queryStr = "INSERT INTO "+ tableName +" VALUES (?,?,?,?)";
    try{
        stmt = conn.prepareStatement(queryStr);
        stmt.setString(1,purc.getPurchaseDetailsID());
        stmt.setString(2,purc.getPurchaseID());
        stmt.setString(3, purc.getStockID());
        stmt.setInt(4, purc.getQuantity());
        stmt.executeUpdate();
    }
    catch (SQLException ex){
        JOptionPane.showMessageDialog(null,ex.getMessage(),"ERROR",JOptionPane.ERROR_MESSAGE);
    }
}

这是UI部分：

 if(e.getSource() == jbtCreate)
        {
            String stockID = jTF.getText();
            String quantity = jTF2.getText();
            Purchase purc = new Purchase();




            if(stockID.isEmpty() || quantity.isEmpty())
            {
                JOptionPane.showMessageDialog(null,"Fields must not be empty","ERROR",JOptionPane.ERROR_MESSAGE);
            }
            else{


            String pID = PID();
            count = count +1;
            String pDID = PDID(count);

            int q = Integer.parseInt(jTF2.getText());
            purc.setQuantity(q);
            String sID= jTF.getText();
            int quantityC = Integer.parseInt(jTF2.getText());


             String priceStr = purcControl.selectPrice(sID);
             double realPrice = Double.parseDouble(priceStr);
             purc.setPurchaseDetailsID(pDID);
             purc.setPrice(realPrice);
             purc.setPurchaseID(pID);
             purc.setQuantity(quantityC);
             purc.setStockID(sID);
             double price = purc.getPrice();
             tableModel.addRow(new Object[]{pDID,sID,price,quantityC});

            purcControl.addRecord(purc);
            }



        }

控制：

 public void addRecord(Purchase purc){
    purcDA.insertRecord(purc);
}

域：

  public Purchase(String purchaseDetailsID,String purchaseID,String stockID,double price,int quantity)
{
    this.purchaseDetailsID = purchaseDetailsID;
    this.purchaseID = purchaseID;
    this.stockID = stockID;
    this.price = price;
    this.quantity = quantity;

    counter ++;
}
public String getPurchaseID(){
    return purchaseID;
}
public void setPurchaseID(String u){
    this.purchaseID = u;
}
public int getCounter(){
    return counter;
}
public String getPurchaseDetailsID(){

    return purchaseDetailsID ;

}
public double getPrice(){
    return price;
}
public String getStockID(){
    return stockID;
}
public int getQuantity(){
    return quantity;
}
public void setPurchaseDetailsID(String r){
    this.purchaseDetailsID = r ;
}
public void setPrice(double p){
    this.price = p;
}
public void setStockID(String s){
    this.stockID = s;
}
public void setQuantity(int q){
    this.quantity = q;
}

我不知道问题出在哪里。每当我进入时，这个错误就出来了。

Answer 1

您似乎正在尝试插入引用＆＃39; P0003＆＃39;在Purchase表中，但该表不包含具有该键值的记录。因此你得到一个外键约束。

首先需要插入缺少的购买记录，或者将您在输入中使用的值更改为在购买表中找到的参考值。

违反外键约束

1 个答案: