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How to delete data in a MySQL database with Java?
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.
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