问题描述
import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import javax.swing.BorderFactory;
import javax.swing.BoxLayout;
import javax.swing.ButtonGroup;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
public class PizzaOrdering implements Runnable {
public static void main(String[] args) {
SwingUtilities.invokelater(new PizzaOrdering());
}
@Override
public void run() {
JFrame frame = new JFrame("KRUSTY KRAB PIZZA");
frame.setDefaultCloSEOperation(JFrame.EXIT_ON_CLOSE);
frame.add(getDeliveryMethodPanel(),BorderLayout.BEFORE_FirsT_LINE);
frame.add(getUser@R_547_4045@ionPanel(),BorderLayout.CENTER);
frame.add(getPizzaSizePanel(),BorderLayout.AFTER_LAST_LINE);
frame.add(getMeatToppingsPanel(),BorderLayout.AFTER_LINE_ENDS);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
private JPanel getDeliveryMethodPanel() {
JPanel deliveryMethodPanel = new JPanel(new FlowLayout());
ButtonGroup orderTypeGroup = new ButtonGroup();
JRadioButton takeouTradioButton =
new JRadioButton("Take Out");
orderTypeGroup.add(takeouTradioButton);
deliveryMethodPanel.add(takeouTradioButton);
JRadioButton deliveryRadioButton =
new JRadioButton("Delivery (Currently Unavailable)");
deliveryRadioButton.setEnabled(false);
orderTypeGroup.add(deliveryRadioButton);
deliveryMethodPanel.add(deliveryRadioButton);
return deliveryMethodPanel;
}
private JPanel getUser@R_547_4045@ionPanel() {
JPanel user@R_547_4045@ionPanel = new JPanel(new GridBagLayout());
user@R_547_404[email protected](
BorderFactory.createEmptyBorder(5,5,5));
GridBagConstraints gbc = new GridBagConstraints();
gbc.anchor = GridBagConstraints.LINE_START;
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.gridx = 0;
gbc.gridy = 0;
gbc.insets = new Insets(5,5);
gbc.weightx = 1d;
JLabel nameLabel = new JLabel("First Name:");
user@R_547_404[email protected](nameLabel,gbc);
gbc.gridx++;
JTextField userNameField = new JTextField(20);
user@R_547_404[email protected](userNameField,gbc);
gbc.gridx = 0;
gbc.gridy++;
JLabel phoneNumberLabel = new JLabel("Phone Number:");
user@R_547_404[email protected](phoneNumberLabel,gbc);
gbc.gridx++;
JTextField userPhoneNumberField = new JTextField(20);
user@R_547_404[email protected](userPhoneNumberField,gbc);
gbc.gridx = 0;
gbc.gridy++;
JLabel zipCodeLabel = new JLabel("Zip Code:");
user@R_547_404[email protected](zipCodeLabel,gbc);
gbc.gridx++;
JTextField userZipCodeField = new JTextField(20);
user@R_547_404[email protected](userZipCodeField,gbc);
return user@R_547_4045@ionPanel;
}
private JPanel getPizzaSizePanel() {
JPanel pizzaSizePanel = new JPanel(new FlowLayout());
ButtonGroup sizeGroup = new ButtonGroup();
JRadioButton smallRadioButton = new JRadioButton("Small");
sizeGroup.add(smallRadioButton);
pizzaSizePanel.add(smallRadioButton);
JRadioButton mediumRadioButton = new JRadioButton("Medium");
sizeGroup.add(mediumRadioButton);
pizzaSizePanel.add(mediumRadioButton);
JRadioButton largeRadioButton = new JRadioButton("Large");
sizeGroup.add(largeRadioButton);
pizzaSizePanel.add(largeRadioButton);
return pizzaSizePanel;
}
private JPanel getMeatToppingsPanel() {
JPanel meatToppingsPanel = new JPanel();
meatToppingsPanel.setBorder(
BorderFactory.createEmptyBorder(5,5));
meatToppingsPanel.setLayout(new BoxLayout(
meatToppingsPanel,BoxLayout.Y_AXIS));
JCheckBox pepperoniCheckBox = new JCheckBox("Pepperoni");
meatToppingsPanel.add(pepperoniCheckBox);
JCheckBox meatballCheckBox = new JCheckBox("Meatball");
meatToppingsPanel.add(meatballCheckBox);
JCheckBox chickenCheckBox = new JCheckBox("Grilled Chicken");
meatToppingsPanel.add(chickenCheckBox);
JCheckBox sausageCheckBox = new JCheckBox("Italian Sausage");
meatToppingsPanel.add(sausageCheckBox);
JCheckBox baconCheckBox = new JCheckBox("Bacon");
meatToppingsPanel.add(baconCheckBox);
return meatToppingsPanel;
}
}
这是我的基本存储库：
Expression<Func<Tips,bool>> lastTipsPredicate = x => x.Status == (int)EnumGringo.LU_Status.active;
IQueryable<Tips> lastQueryBase(DbSet<Tips> t) => t.OrderByDescending(x => x.CreateDate).Take(6);
IEnumerable<Tips> latestTips = await base.GetAllByCondition(lastTipsPredicate,lastQueryBase);
public virtual async Task<IEnumerable<TEntity>> GetAllByCondition(Expression<Func<TEntity,bool>> predicate,Func<DbSet<TEntity>,IQueryable<TEntity>> baseQuery = null)
{
IQueryable<TEntity> q = context.Set<TEntity>();
if (baseQuery != null)
{
q = baseQuery(context.Set<TEntity>());
}
return await q.Where(predicate).ToListAsync();
}
仅返回5条记录，而不是我期望的6条记录，因为它具有状态，所以将过滤掉1条记录！= 1。
此查询正确无误，并返回最后6条记录：
exec sp_executesql N'SELECT [t].[ID],[t].[CreateDate],[t].[Description],[t].[InsertedByGringo],[t].[IsRecommended],[t].[IsSubscribe],[t].[LanguageType],[t].[SEOId],[t].[Slug],[t].[Status],[t].[Title],[t].[UserID],[t].[ViewCount]
FROM (
SELECT TOP(@__p_0) [x].[ID],[x].[CreateDate],[x].[Description],[x].[InsertedByGringo],[x].[IsRecommended],[x].[IsSubscribe],[x].[LanguageType],[x].[SEOId],[x].[Slug],[x].[Status],[x].[Title],[x].[UserID],[x].[ViewCount]
FROM [Tips] AS [x]
ORDER BY [x].[CreateDate] DESC
) AS [t]
WHERE [t].[Status] = 1',N'@__p_0 int',@__p_0=6
解决方法
Efcore 2.2- where子句在选择后运行并返回错误结果
这既不是EF Core也不是LINQ问题，而是您的存储库方法构建LINQ查询的方式。
如果您要先应用过滤（Where，然后再选择其余过滤，则应将baseQuery函数输入类型从DbSet<TEntity>更改为IQueryable<TEntity>，然后实现如下：
public virtual async Task<IEnumerable<TEntity>> GetAllByCondition(
Expression<Func<TEntity,bool>> predicate,Func<IQueryable<TEntity>,IQueryable<TEntity>> baseQuery = null)
{
var q = context.Set<TEntity>()
.Where(predicate); // <-- (1)
if (baseQuery != null)
q = baseQuery(q); // <-- (2)
return await q.ToListAsync();
}