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Set Data Types by using Prepared Statement

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In this section we are going to learn the method for setting data types (String, int, float and double) in the PreparedStatement interface of java.sql package.

Set Data Types by using Prepared Statement

     

In this section we are going to learn the method for setting data types (String, int, float and double) in the PreparedStatement interface of java.sql package. We know that the data types of MySQL and java programming language are not same but we need some mechanism for transferring the data to each other Java and MySQL. Mapping between both java and MySQL provides the facility for supporting each data types like: 

Java data type    MySQL data type
int   integer (INTEGER)
double  double, float (DOUBLE, FLOAT)
float  real (REAL)

Description of program:

Here, we are going to set some java data types by using the PreparedStatement with the help of this program. The program first of all establishes the connection with MySQL database through the JDBC driver. After establishing a connection the prepareStatement takes SQL query statement and then returns the PreparedStatement object. Now,  we will set all data types like String, int, double and float by using some methods like: setString, setInt, setDouble and setFloat method. These methods set the data in the database table (student) individually according to it's nature that is supported by both java and MySQL. Data is then added in the database table (student) that can be seen in a message as "row(s) affected" otherwise a display phrase as "SQL statement is not executed!". 

Here is the code of program:

import java.sql.*;

public class SetDataTypes{
  public static void main(String[] args) {
  System.out.println("Set string,ingeger,double 
and float example by using the Prepared Statement!"
);
  Connection con = null;
  try{
  Class.forName("com.mysql.jdbc.Driver");
  con = DriverManager.getConnection("jdbc:mysql:
//localhost:3306/jdbctutorial"
,"root","root");
  try{
  String sql = "INSERT student VALUES(?,?,?,?)";
  PreparedStatement prest = con.prepareStatement(sql);
  prest.setString(1,"deepak");
  prest.setInt(2,95);
  prest.setDouble(3,32.50);
  prest.setFloat(4,41.52f);
  int row = prest.executeUpdate();
  System.out.println(row + " row(s) affected)");
  }
  catch (SQLException s){
  System.out.println("SQL statement is not executed!");
  }
  }
  catch (Exception e){
  e.printStackTrace();
  }
  }
}

Download this example.

Database Table: student 

Stu_name Stu_marks Stu_ave Stu_total
raju (NULL) (NULL) (NULL)
virendra 86 35.255 56.05
deepak 95 32.5 41.52

Output of program:

C:\vinod\jdbc\jdbc\PreparedStatement>javac SetDataTypes.java

C:\vinod\jdbc\jdbc\PreparedStatement>java SetDataTypes
Set string,ingeger,double and float example by using the Prepared Statement!
1 row(s) affected)

After executing the program:

Database Table: student

Stu_name Stu_marks Stu_ave Stu_total
raju (NULL) (NULL) (NULL)
virendra 86 35.255 56.05
deepak 95 32.5 41.52
vinod 86 47.52 65.025
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Posted on: April 13, 2007

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