Delete data from a MySQL database with the help of DELETE command. The syntax is as follows.
delete from yourTableName where condition;
I will delete data from a MySQL database with the help of JAVA programming language. First, create a table and insert some records. The following is the query to create a table.
mysql> create table DeleteTableDemo -> ( -> id int, -> Name varchar(200) -> ); Query OK, 0 rows affected (0.94 sec)
Insert records in the above table. The query to insert records is as follows.
mysql> insert into DeleteTableDemo values(101,'Smith'); Query OK, 1 row affected (0.21 sec) mysql> insert into DeleteTableDemo values(102,'Johnson'); Query OK, 1 row affected (0.27 sec)
Now we can check how many records are in my table. The query is as follows.
mysql> select *from DeleteTableDemo;
The following is the output.
+------+---------+ | id | Name | +------+---------+ | 101 | Smith | | 102 | Johnson | +------+---------+ 2 rows in set (0.00 sec)
We have two records in the table. Now, let us deleted data from a MySQL database table with the help of delete command. Here is the JAVA code that deletes the data with id=101. Before that, we will establish a Java Connection to our MySQL database.
import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.SQLException; import com.mysql.jdbc.Connection; import com.mysql.jdbc.PreparedStatement; import com.mysql.jdbc.Statement; public class JavaDeleteDemo { public static void main(String[] args) { Connection conn = null; Statement stmt = null; try { try { Class.forName("com.mysql.jdbc.Driver"); } catch (Exception e) { System.out.println(e); } conn = (Connection) DriverManager.getConnection("jdbc:mysql://localhost/business", "Manish", "123456"); System.out.println("Connection is created successfully:"); stmt = (Statement) conn.createStatement(); String query1 = "delete from DeleteTableDemo " + "where id=101"; stmt.executeUpdate(query1); System.out.println("Record is deleted from the table successfully.................."); } catch (SQLException excep) { excep.printStackTrace(); } catch (Exception excep) { excep.printStackTrace(); } finally { try { if (stmt != null) conn.close(); } catch (SQLException se) {} try { if (conn != null) conn.close(); } catch (SQLException se) { se.printStackTrace(); } } System.out.println("Please check it in the MySQL Table. Record is now deleted......."); } }
The following is the output.
mysql> select *from DeleteTableDemo;
The following is the output.
+------+---------+ | id | Name | +------+---------+ | 102 |Johnson | +------+---------+ 1 row in set (0.00 sec) We have deleted the data with id 101.