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Question:how to iBATIS - Read Operation?


 

We have following EMPLOYEE table in MySQL:
 
CREATE TABLE EMPLOYEE (
   id INT NOT NULL auto_increment,
   first_name VARCHAR(20) default NULL,
   last_name  VARCHAR(20) default NULL,
   salary     INT  default NULL,
   PRIMARY KEY (id)
);
This table is having only one record as follows:
 
mysql> select * from EMPLOYEE;
+----+------------+-----------+--------+
| id | first_name | last_name | salary |
+----+------------+-----------+--------+
|  1 | Zara       | Ali       |   5000 |
+----+------------+-----------+--------+
1 row in set (0.00 sec)
Employee POJO Class:
To perform read operation we would modify Employee class in Employee.java file as follows:
 
public class Employee {
  private int id;
  private String first_name; 
  private String last_name;   
  private int salary;  
 
  /* Define constructors for the Employee class. */
  public Employee() {}
  
  public Employee(String fname, String lname, int salary) {
    this.first_name = fname;
    this.last_name = lname;
    this.salary = salary;
  }
 
  /* Here are the method definitions */
  public int getId() {
    return id;
  }
  public String getFirstName() {
    return first_name;
  }
  public String getLastName() {
    return last_name;
  }
  public int getSalary() {
    return salary;
  }
} /* End of Employee */
Employee.xml File:
To define SQL mapping statement using iBATIS, we would add
   SELECT * FROM EMPLOYEE
Here we did not use WHERE clause with SQL SELECT statement. Subsequent chapter would demonstrate how you can use WHERE clause with SELECT statement and how you can pass values to that WHERE clause.
 
IbatisRead.java File:
This file would have application level logic to read records from the Employee table:
 
import com.ibatis.common.resources.Resources;
import com.ibatis.sqlmap.client.SqlMapClient;
import com.ibatis.sqlmap.client.SqlMapClientBuilder;
import java.io.*;
import java.sql.SQLException;
import java.util.*;
 
public class IbatisRead{
  public static void main(String[] args)
   throws IOException,SQLException{
   Reader rd = Resources.getResourceAsReader("SqlMapConfig.xml");
   SqlMapClient smc = SqlMapClientBuilder.buildSqlMapClient(rd);
 
   /* This would read all records from the Employee table. */
   System.out.println("Going to read records.....");
   List ems = (List)
                        smc.queryForList("Employee.getAll", null);
   Employee em = null;
   for (Employee e : ems) {
      System.out.print("  " + e.getId());
      System.out.print("  " + e.getFirstName());
      System.out.print("  " + e.getLastName());
      System.out.print("  " + e.getSalary());
      em = e; 
      System.out.println("");
   }    
 
   System.out.println("Records Read Successfully ");
 
  }
} 
Compilation and Run:
Here are the steps to compile and run the above mentioned software. Make sure you have set PATH and CLASSPATH appropriately before proceeding for the compilation and execution.
 
Create Employee.xml as shown above.
 
Create Employee.java as shown above and compile it.
 
Create IbatisRead.java as shown above and compile it.
 
Execute IbatisRead binary to run the program.
 
You would get following result, and a record would be read from the EMPLOYEE table.
 
Going to read records.....
  1  Zara  Ali  5000
Record Reads Successfully
asked Sep 13, 2013 in iBATIS by ashish singh
edited Sep 12, 2013 by ashish singh
0 votes
31 views



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