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xixu-me committed 2024-07-02 14:34:52 +08:00
1 parent 911b897d5b
commit c32363aefb
2 files changed
+150 -146
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src/client/Client.java
+145 -145
View File
@@ -154,181 +154,181 @@ public class Client {
return response;
}
public static void display() {
private static void openConnection() {
con = DBConnection.getConnection();
}
private static void closeResources() {
try {
if (rs != null)
rs.close();
if (ps != null)
ps.close();
if (statement != null)
statement.close();
DBConnection.close(con, null);
} catch (Exception e) {
e.printStackTrace();
}
}
public static void display() {
openConnection();
String sql = "select * from book limit 10";
try {
statement = con.createStatement();
rs = statement.executeQuery(sql);
while (rs.next()) {
Book book = new Book();
book.setTitle(rs.getString(1));
book.setAuthor(rs.getString(2));
book.setPublisher(rs.getString(3));
book.setOldprice(rs.getDouble(4));
book.setNewprice(rs.getDouble(5));
book.setHref(rs.getString(6));
Book book = new Book(rs.getString(1), rs.getString(2), rs.getString(3), rs.getDouble(4),
rs.getDouble(5), rs.getString(6));
System.out.println(book.toString());
}
} catch (Exception e) {
e.printStackTrace();
} finally {
closeResources();
}
if (rs != null)
try {
rs.close();
} catch (Exception e) {
e.printStackTrace();
}
if (statement != null)
try {
statement.close();
} catch (Exception e) {
e.printStackTrace();
}
DBConnection.close(con, ps);
}
public static void query() {
String sql = null;
System.out.println("====== Querying library data =======");
System.out.println("1. Querying by title;");
System.out.println("2. Querying by author;");
System.out.println("3. Querying by publisher;");
System.out.println("4. Querying by price;");
System.out.println("5. Return to previous menu.");
System.out.println("Please enter options (1-5):");
int n = 0;
n = scan.nextInt();
scan.nextLine();
switch (n) {
case 1:
sql = "select * from book where title = ?";
System.out.println("Please enter the title:");
outputQuery(sql);
break;
case 2:
sql = "select * from book where author = ?";
System.out.println("Please enter the author:");
outputQuery(sql);
break;
case 3:
sql = "select * from book where publisher = ?";
System.out.println("Please enter the publisher:");
outputQuery(sql);
break;
case 4:
sql = "select * from book where newprice = ?";
System.out.println("Please enter the price:");
outputQuery(sql);
break;
default:
break;
}
}
public static void outputQuery(String sql) {
con = DBConnection.getConnection();
String title, author, pubilsher, oldprice, newprice, url;
String inquire = scan.nextLine();
openConnection();
try {
ps = con.prepareStatement(sql);
ps.setString(1, inquire);
rs = ps.executeQuery();
while (rs.next()) {
title = rs.getString(1);
author = rs.getString(2);
pubilsher = rs.getString(3);
oldprice = rs.getString(4);
newprice = rs.getString(5);
url = rs.getString(6);
System.out.println("Title: " + title + ", Author: " + author + ", Publisher: " + pubilsher
+ ", Original Price: " + oldprice + ", Discounted Price: " + newprice + ", URL: " + url);
System.out.println("====== Querying library data =======");
System.out.println("1. Querying by title;");
System.out.println("2. Querying by author;");
System.out.println("3. Querying by publisher;");
System.out.println("4. Querying by price;");
System.out.println("5. Return to previous menu.");
System.out.println("Please enter options (1-5):");
int n = scan.nextInt();
scan.nextLine();
String sql = "";
switch (n) {
case 1:
sql = "select * from book where title = ?";
System.out.println("Please enter the title:");
break;
case 2:
sql = "select * from book where author = ?";
System.out.println("Please enter the author:");
break;
case 3:
sql = "select * from book where publisher = ?";
System.out.println("Please enter the publisher:");
break;
case 4:
sql = "select * from book where newprice = ?";
System.out.println("Please enter the price:");
break;
default:
break;
}
if (!sql.isEmpty()) {
ps = con.prepareStatement(sql);
ps.setString(1, scan.nextLine());
rs = ps.executeQuery();
while (rs.next()) {
String title = rs.getString(1);
String author = rs.getString(2);
String pubilsher = rs.getString(3);
String oldprice = rs.getString(4);
String newprice = rs.getString(5);
String url = rs.getString(6);
System.out.println("Title: " + title + ", Author: " + author + ", Publisher: " + pubilsher
+ ", Original Price: " + oldprice + ", Discounted Price: " + newprice + ", URL: " + url);
}
}
rs.close();
} catch (Exception e) {
e.printStackTrace();
} finally {
closeResources();
}
DBConnection.close(con, ps);
}
public static void delete() {
con = DBConnection.getConnection();
System.out.println("Please enter the title:");
String title = scan.nextLine();
openConnection();
System.out.println("Please enter the title of the book you want to delete:");
String sql = "delete from book where title = ?";
try {
ps = con.prepareStatement(sql);
ps.setString(1, title);
ps.executeUpdate();
System.out.println("Delete successfully!");
ps.setString(1, scan.nextLine());
int affectedRows = ps.executeUpdate();
if (affectedRows > 0) {
System.out.println("Delete successfully!");
} else {
System.out.println("No record found to delete.");
}
} catch (Exception e) {
System.err.println("Delete failed!");
e.printStackTrace();
} finally {
closeResources();
}
DBConnection.close(con, ps);
}
public static void update() {
con = DBConnection.getConnection();
String sql = null;
System.out.println("Please enter the title:");
String title = scan.nextLine();
System.out.println("====== Modifying library data =======");
System.out.println("1. Modifying author;");
System.out.println("2. Modifying publisher;");
System.out.println("3. Modifying price;");
System.out.println("4. Return to previous menu.");
System.out.println("Please enter options (1-4):");
int n = 0;
n = scan.nextInt();
scan.nextLine();
String inquery = null;
switch (n) {
case 1:
System.out.println("Please enter the modified author:");
inquery = scan.nextLine();
sql = "update book set author = ? where title = ?";
try {
ps = con.prepareStatement(sql);
ps.setString(1, inquery);
ps.setString(2, title);
ps.executeUpdate();
} catch (Exception e) {
e.printStackTrace();
}
break;
case 2:
System.out.println("Please enter the modified publisher:");
inquery = scan.nextLine();
sql = "update book set publisher = ? where title = ?";
try {
ps = con.prepareStatement(sql);
ps.setString(1, inquery);
ps.setString(2, title);
ps.executeUpdate();
} catch (Exception e) {
e.printStackTrace();
}
break;
case 3:
System.out.println("Please enter the modified price:");
inquery = scan.nextLine();
sql = "update book set oldprice = newprice where title = ?";
String sql2 = "update book set newprice = ? where title = ?";
try {
ps = con.prepareStatement(sql);
ps.setString(1, title);
ps.executeUpdate();
ps = con.prepareStatement(sql2);
ps.setString(1, inquery);
ps.setString(2, title);
ps.executeUpdate();
} catch (Exception e) {
e.printStackTrace();
}
break;
default:
break;
try {
con = DBConnection.getConnection();
System.out.println("Please enter the title:");
String title = scan.nextLine();
System.out.println("====== Modifying library data =======");
System.out.println("1. Modifying author;");
System.out.println("2. Modifying publisher;");
System.out.println("3. Modifying price;");
System.out.println("4. Return to previous menu.");
System.out.println("Please enter options (1-4):");
int choice = scan.nextInt();
scan.nextLine();
switch (choice) {
case 1:
updateField("author", title);
break;
case 2:
updateField("publisher", title);
break;
case 3:
updatePrice(title);
break;
default:
System.out.println("Returning to previous menu.");
break;
}
} catch (Exception e) {
e.printStackTrace();
} finally {
DBConnection.close(con, ps);
}
}
private static void updateField(String field, String title) throws Exception {
System.out.println("Please enter the modified " + field + ":");
String newValue = scan.nextLine();
String sql = "UPDATE book SET " + field + " = ? WHERE title = ?";
ps = con.prepareStatement(sql);
ps.setString(1, newValue);
ps.setString(2, title);
int affectedRows = ps.executeUpdate();
if (affectedRows > 0)
System.out.println("Update successful!");
else
System.out.println("No record found to update.");
}
private static void updatePrice(String title) throws Exception {
System.out.println("Please enter the modified price:");
String newPrice = scan.nextLine();
String sqlUpdateOldPrice = "UPDATE book SET oldprice = newprice WHERE title = ?";
ps = con.prepareStatement(sqlUpdateOldPrice);
ps.setString(1, title);
ps.executeUpdate();
String sqlUpdateNewPrice = "UPDATE book SET newprice = ? WHERE title = ?";
ps = con.prepareStatement(sqlUpdateNewPrice);
ps.setString(1, newPrice);
ps.setString(2, title);
int affectedRows = ps.executeUpdate();
if (affectedRows > 0) {
System.out.println("Price update successful!");
} else {
System.out.println("No record found to update price.");
}
DBConnection.close(con, ps);
}
}
src/server/vo/User.java
+5 -1
View File
@@ -7,7 +7,11 @@ public class User {
private String role;
public User() {
super();
}
public User(String userName, String password) {
this.userName = userName;
this.password = password;
}
public String getUserName() {