A JDBC PreparedStatement example to delete a row.
RowDelete.java
package com.mkyong.jdbc.preparestatement.row;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;
public class RowDelete {
private static final String SQL_DELETE = "DELETE FROM EMPLOYEE WHERE NAME=?";
public static void main(String[] args) {
try (Connection conn = DriverManager.getConnection(
"jdbc:postgresql://127.0.0.1:5432/test", "postgres", "password");
PreparedStatement preparedStatement = conn.prepareStatement(SQL_DELETE)) {
preparedStatement.setString(1, "mkyong");
int row = preparedStatement.executeUpdate();
// rows affected
System.out.println(row);
} catch (SQLException e) {
System.err.format("SQL State: %s\n%s", e.getSQLState(), e.getMessage());
} catch (Exception e) {
e.printStackTrace();
}
}
}
P.S Tested with PostgreSQL 11 and Java 8
pom.xml
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<version>42.2.5</version>
</dependency>
Download Source Code
$ git clone https://github.com/mkyong/java-jdbc.git
try (Connection conn = DriverManager.getConnection(
“jdbc:postgresql://127.0.0.1:5432/test”, “postgres”, “password”);
PreparedStatement preparedStatement = conn.prepareStatement(“DELETE FROM USER WHERE NAME=? and Keys in (?)”) {
preparedStatement.setString(1, “name”);
preparedStatement.setString(2, “listofkeys”);
( listofkeys , i am sending like ‘AS’,’Asdf’)
int row = preparedStatement.executeUpdate();
unable to perform operation?
statement.setInt(1, 1001); what does this line?
The above delete query “DELETE DBUSER WHERE USER_ID = ?”; is incorrect because the syntax for delete is DELETE FROM table_name
WHERE condition;
Here, FROM keyword is missing.
I created a frontend for my school project using jdbc drivers,i have a issue with the delete button.When i enter nothing in the text field and press the delete button Iam not getting a popup menu as an exception.
the code is pasted below,please suggest changes :
private void billdeleteActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
try{
Class.forName(“oracle.jdbc.driver.OracleDriver”);
int id=Integer.parseInt(billidtext.getText());
try (//step2 create the connection object
Connection con = DriverManager.getConnection(“jdbc:oracle:thin:localhost:xe”,”hr”,”****”)) {
Statement stmt=con.createStatement();
stmt = con.createStatement();
String sql = “DELETE FROM bill ” +
“WHERE bid = (‘”+id+”‘)”;
int w=stmt.executeUpdate(sql);
if(w!=0)
JOptionPane.showMessageDialog(null,”Deleted Successfully!”); //this is displayed successfully
else
JOptionPane.showMessageDialog(null,”value does not exists!”);// this is displayed successfully
supplieridtext.setText(“”);
//view trigger
String sql1=”SELECT * FROM bill”;
stmt = con.createStatement();
ResultSet rs = stmt.executeQuery(sql1);
//STEP 5: Extract data from result set
billtable.setModel(DbUtils.resultSetToTableModel(rs));
rs.close();
//step5 close the connection object
}
}catch( ClassNotFoundException | SQLException e){
JOptionPane.showMessageDialog(null,”no value entered!”);} //this line is not displayed when the text field is empty
}
How about a Chinese character in Where condition Please provide solution of it…
Great article, my question is: I need to add a confirm delete statement, where do I put it and what should it look like?
Should “DELETE DBUSER WHERE USER_ID = ?” be “DELETE FROM DBUSER WHERE USER_ID = ?” instead?
Thanks
yes
this class should be named JDBCPreparedStatementDeleteExample