问题
Let's suppose we have a JFrame called FrmRegistration. Its function is inserting data into a table called records.
MySQL's command desc records would result the following:
+-----------+--------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-----------+--------------+------+-----+---------+-------+
| id | varchar(7) | NO | PRI | | |
| name | varchar(100) | NO | | NULL | |
| birthday | date | NO | | NULL | |
+-----------+--------------+------+-----+---------+-------+
Within FrmRegistration there's a JFormattedTextField for birthday input we'll call ftfBirthday. In Netbeans, we put names into components by right-clicking it and going to Properties -> Code tab -> Variable name. Or right-click -> Customize code -> Rename... button.
Right-click the field and go to Properties, then in FormatterFactory, click the "..." button. Create a customized field with: ####/##/##
The reason for a JFormattedTextField is that the user wouldn't lose time by typing the slashes. They appear automatically.
What should be done in the source-code of a button in FrmRegistration called Insert?
回答1:
Before going to the source-code, right-click the date field and go to Properties. Copy the content of text. It should be (a = one space):
aaaa/aa/aa
It will be used in the "} else if (" / / ".equals(birthday)) {" line.
(See the code for proper parameter)
I added some things extra, like checking if fields are empty.
try {
Class.forName("com.mysql.jdbc.Driver");
try (Connection con = DriverManager.getConnection(
"jdbc:mysql://localhost/database_name_here",
"username_here", "password_here")) {
String if = txtId.getText();
String name = txtName.getText();
String birthday = ftfBirthday.getText();
PreparedStatement stmt = con.prepareStatement(
"INSERT INTO records "
+ "(id, name, birthday)"
+ "VALUES(?,?,STR_TO_DATE(?,'%Y/%m/%d'))");
if (id.isEmpty()) {
JOptionPane.showMessageDialog(null,
"The ID field must be completed!");
} else if (name.isEmpty()) {
JOptionPane.showMessageDialog(null,
"The Name field must be completed!");
} else if (" / / ".equals(birthday)) {
JOptionPane.showMessageDialog(null,
"The Birthday field must be completed!");
} else {
stmt.setString(1, id);
stmt.setString(2, name);
stmt.setString(3, birthday);
stmt.executeUpdate();
JOptionPane.showMessageDialog(this, " Data was saved successfully! ");
}
}
} catch (SQLException e) {
JOptionPane.showMessageDialog(this, "SQL command error "
+ e.getMessage());
} catch (ClassNotFoundException e) {
JOptionPane.showMessageDialog(this,
" Database driver not found ");
}
That's it. Hope it helps someone! :-)
来源：https://stackoverflow.com/questions/13390827/using-str-to-date-in-java-to-insert-date-with-preparedstatement