public static EntityTypeBuilder ToTable([NotNullAttribute] this EntityTypeBuilder entityTypeBuilder, [CanBeNullAttribute] string name);

时间: 2024-01-07 22:05:37 浏览: 11
这是一个扩展方法,用于在Fluent API中将实体映射到数据库中的表。它需要两个参数,一个是EntityTypeBuilder类型的对象,表示正在构建映射的实体。另一个是字符串类型的name参数,表示实体在数据库中所映射的表名。 在EF Core中,您可以使用Fluent API来配置实体模型,并将其映射到数据库中的表和列。使用ToTable方法可以指定实体所映射的表名。例如: ``` public class PersonConfiguration : IEntityTypeConfiguration<Person> { public void Configure(EntityTypeBuilder<Person> builder) { builder.ToTable("Persons"); //其他配置... } } ``` 在此示例中,我们将Person实体映射到名为"Persons"的表中。配置完成后,EF Core将在数据库中创建一个名为"Persons"的表,并将Person实体的属性映射到表的列中。
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public static EntityTypeBuilder ToTable

`ToTable` 是 Entity Framework 中 `EntityTypeBuilder` 类的一个扩展方法,用于指定实体类型映射到的数据库表名。它的语法通常是这样的: ``` public static EntityTypeBuilder<TEntity> ToTable<TEntity>(this EntityTypeBuilder<TEntity> builder, string name) where TEntity : class; ``` 其中,`builder` 是 `EntityTypeBuilder<TEntity>` 类的实例,`name` 是实体类型映射到的数据库表名。`ToTable` 方法返回一个 `EntityTypeBuilder<TEntity>` 实例,它可以用于进一步配置实体类型的映射规则。 需要注意的是,`ToTable` 方法通常是在 `OnModelCreating` 方法中使用的,用于配置实体类型与数据库表之间的映射关系。如果你想了解更多关于 Entity Framework 和 `EntityTypeBuilder` 的内容,可以参考相关的文档。

public static void scanTable(String tableName) throws IOException{

As an AI language model, I cannot provide the entire implementation of the method. However, I can give you an idea of what this method can potentially do. The method `scanTable` takes in a parameter `tableName` which is the name of a table that needs to be scanned. Based on this input, the method can perform the following actions: 1. Connect to the database where the table is stored. 2. Retrieve the schema of the given table. 3. Fetch all the rows from the table. 4. Iterate through each row and extract the required data. 5. Perform any necessary data processing or analysis on the retrieved data. 6. Close the database connection. In summary, the `scanTable` method can be used to scan and retrieve data from a given database table.

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import java.awt.event.*; import java.awt.*; import javax.swing.*; import javax.swing.table.DefaultTableModel; public class MyTableWin extends JFrame implements ActionListener { Object rows[][] = { { "001", "zhang", "03/04/2002", "Computer" }, { "002", "Li", "05/10/2002", "Chinese" }, { "003", "Wang", "09/10/2002", "English" } }; String cols[] = { "number", "name", "birthday", "department" }; JTable table; JLabel lbl_show; JTextField txt_show; JButton btn_update; JPanel pSouth, pNorth; JScrollPane jp; public MyTableWin() { table = new JTable(rows, cols); // 表格里点谁就显示谁 table.addMouseListener(new MouseAdapter() { public void mouseClicked(MouseEvent e) { int row = table.getSelectedRow(); int column = table.getSelectedColumn(); Object selectedvalue = table.getModel().getValueAt(row, column); txt_show.setText((String) selectedvalue); btn_update.setEnabled(true); } }); lbl_show = new JLabel("Info."); txt_show = new JTextField(15); btn_update = new JButton("Update"); btn_update.setEnabled(false); btn_update.addActionListener(this); pSouth = new JPanel(); pNorth = new JPanel(); jp = new JScrollPane(table); pNorth.add(jp); pSouth.add(lbl_show); pSouth.add(txt_show); pSouth.add(btn_update); add(pNorth, BorderLayout.CENTER); add(pSouth, BorderLayout.SOUTH); setVisible(true); setSize(800, 500); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } public void actionPerformed(ActionEvent e) { int row = table.getSelectedRow(); int column = table.getSelectedColumn(); rows[row][column] = txt_show.getText(); int option = JOptionPane.showConfirmDialog(this, "do you confirm to update the table content?", "warning", JOptionPane.OK_CANCEL_OPTION); if (option == JOptionPane.OK_OPTION) { table.setModel(new DefaultTableModel(rows, cols)); } btn_update.setEnabled(false); } public static void main(String[] args) { MyTableWin win = new MyTableWin(); } }修改该程序,使得点击表格时,在控件台显示所在行一行的数据。

根据以下要求:Instead of using a binary file to save the arraylist of points, change the savaData method and the constructor of the Model class to use a database to write / read the coordinates of all the points. Use XAMPP and phpMyAdmin to create a database called "java" with a table called "points" that has two integer columns x and y (in addition to the ID primary key). Hint: make sure you delete all the old point coordinates from the database before inserting new ones. Hint: use phpMyAdmin to check what is stored in the database。修改下述代码:public class Model implements Serializable { private ArrayList points; private ArrayList<ModelListener> listeners; private static final String FILE_NAME = "points.bin"; public Model() { points = new ArrayList(); listeners = new ArrayList<ModelListener>(); // Read points from file if it exists File file = new File(FILE_NAME); if (file.exists()) { try { ObjectInputStream in = new ObjectInputStream(new FileInputStream(file)); points = (ArrayList) in.readObject(); in.close(); } catch (IOException e) { e.printStackTrace(); } catch (ClassNotFoundException e) { e.printStackTrace(); } } } public void addListener(ModelListener l) { listeners.add(l); } public ArrayList getPoints() { return points; } public void addPoint(Point p) { points.add(p); notifyListeners(); // points changed so notify the listeners. saveData(); // save point to file } public void clearAllPoints() { points.clear(); notifyListeners(); // points changed so notify the listeners. saveData(); // save empty list to file } public void deleteLastPoint() { if (points.size() > 0) { points.remove(points.size() - 1); notifyListeners(); // points changed so notify the listeners. saveData(); // save updated list to file } } private void notifyListeners() { for (ModelListener l : listeners) { l.update(); // Tell the listener that something changed. } } public int numberOfPoints() { return points.size(); } public void saveData() { try { ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(FILE_NAME)); out.writeObject(points); out.close(); } catch (IOException e) { e.printStackTrace(); } } }

根据以下要求:Instead of using a binary file to save the arraylist of points, change the savaData method and the constructor of the Model class to use a database to write / read the coordinates of all the points. Use XAMPP and phpMyAdmin to create a database called "java" with a table called "points" that has two integer columns x and y (in addition to the ID primary key). Hint: make sure you delete all the old point coordinates from the database before inserting new ones. Hint: use phpMyAdmin to check what is stored in the database. Use the Test class to run all the tests for the software and check that all the tests still work. Use the Start class to run the software and check that closing the software correctly saves the point coordinates in the database (use phpMyAdmin to check the content of the database). Run the software again and check that all the points from the previous run are correctly displayed,修改下述代码:public class Model implements Serializable { private ArrayList points; private ArrayList<ModelListener> listeners; private static final String FILE_NAME = "points.bin"; public Model() { points = new ArrayList(); listeners = new ArrayList<ModelListener>(); // Read points from file if it exists File file = new File(FILE_NAME); if (file.exists()) { try { ObjectInputStream in = new ObjectInputStream(new FileInputStream(file)); points = (ArrayList) in.readObject(); in.close(); } catch (IOException e) { e.printStackTrace(); } catch (ClassNotFoundException e) { e.printStackTrace(); } } } public void addListener(ModelListener l) { listeners.add(l); } public ArrayList getPoints() { return points; } public void addPoint(Point p) { points.add(p); notifyListeners(); // points changed so notify the listeners. saveData(); // save point to file } public void clearAllPoints() { points.clear(); notifyListeners(); // points changed so notify the listeners. saveData(); // save empty list to file } public void deleteLastPoint() { if (points.size() > 0) { points.remove(points.size() - 1); notifyListeners(); // points changed so notify the listeners. saveData(); // save updated list to file } } private void notifyListeners() { for (ModelListener l : listeners) { l.update(); // Tell the listener that something changed. } } public int numberOfPoints() { return points.size(); } public void saveData() { try { ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(FILE_NAME)); out.writeObject(points); out.close(); } catch (IOException e) { e.printStackTrace(); } }

The following is the data that you can add to your input file (as an example). Notice that the first line is going to be a line representing your own hobbies. In my case, it is the Vitaly,table tennis,chess,hacking line. Your goal is to create a class called Student. Every Student will contain a name (String) and an ArrayList<String> storing hobbies. Then, you will add all those students from the file into an ArrayList<Student>, with each Student having a separate name and ArrayList of hobbies. Here is an example file containing students (the first line will always represent yourself). NOTE: eventually, we will have a different file containing all our real names and hobbies so that we could find out with how many people each of us share the same hobby. Vitaly,table tennis,chess,hacking Sean,cooking,guitar,rainbow six Nolan,gym,piano,reading,video games Jack,cooking,swimming,music Ray,piano,video games,volleyball Emily,crochet,drawing,gardening,tuba,violin Hudson,anime,video games,trumpet Matt,piano,Reading,video games,traveling Alex,swimming,video games,saxophone Roman,piano,dancing,art Teddy,chess,lifting,swimming Sarah,baking,reading,singing,theatre Maya,violin,knitting,reading,billiards Amy,art,gaming,guitar,table tennis Daniel,video games,tennis,soccer,biking,trumpet Derek,cooking,flute,gaming,swimming,table tennis Daisey,video games,guitar,cleaning,drawing,animated shows,reading,shopping Lily,flute,ocarina,video games,baking Stella,roller skating,sudoku,watching baseball,harp Sophie,viola,ukulele,piano,video games

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