Java JDBC: Where clause condition using JDBC Statement Interface

June 25, 2016 SJ JDBC 0

In this article, we will use JDBC API to fetch records using where clause condition from newly created table in MySQL database from Java application i.e.; using Statement Interface

 

1. Pre-requisite:

  • Java JDK 1.8.0_77
  • MySQL database 5.5.16
  • Eclipse Luna IDE 4.4.0
  • mysql-connector-java-5.1.38.jar file

 

2. Database parameters:

Let us move on and code an example to connect MySQL database from Java application to fetch records using where clause condition using JDBC API. But before that, we will list down required things to connect database

  • database server IP or address (localhost)
  • sever port (3306)
  • database name (PLAYER_INFO)
  • username (root)
  • password (root@123)

Note: All bold are database values to connect MySQL database

 

3. Where clause condition using JDBC Statement Interface

  • As we are ready with required things to connect MySQL database from Java application
  • We can use one of the method from Statement Interface to execute “where clause condition to fetch selected records” SQL query
    1. execute(String sqlQuery);
    2. executeUpdate(String sqlQuery);
    3. executeQuery(String sqlQuery);
  • Let us code a simple example using Statement Interface

WhereClauseConditionUsingJDBCStatement.java

package in.bench.resources.mysql.db.clause;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class WhereClauseConditionUsingJDBCStatement {

	public static void main(String[] args) {

		// variables
		Connection connection = null;
		Statement statement = null;
		ResultSet resultSet = null;

		// Step 1: Loading or registering MySQL JDBC driver class
		try {
			Class.forName("com.mysql.jdbc.Driver");
		}
		catch(ClassNotFoundException cnfex) {
			System.out.println("Problem in loading MySQL JDBC driver");
			cnfex.printStackTrace();
		}

		// Step 2: Opening database connection
		try {

			// Step 2.A: Create and get connection using DriverManager
			connection = DriverManager.getConnection(
					"jdbc:mysql://localhost:3306/PLAYER_INFO", 
					"root", 
					"root@123"); 

			// Step 2.B: Creating JDBC Statement 
			statement = connection.createStatement();

			// to get all players with more than 150 matches
			String sqlSelectQuery ="SELECT * FROM PLAYER"
					+ " WHERE MATCHES > 150";

			// Step 2.C: Executing SQL & retrieve data into ResultSet
			resultSet = statement.executeQuery(sqlSelectQuery);

			System.out.println("ID\tName\t\t\tAge\tMatches");
			System.out.println("==\t================\t===\t=======");

			// processing returned data and printing into console
			while(resultSet.next()) {
				System.out.println(resultSet.getInt(1) + "\t" + 
						resultSet.getString(2) + "\t" + 
						resultSet.getInt(3) + "\t" +
						resultSet.getInt(4));
			}
		}
		catch(SQLException sqlex){
			sqlex.printStackTrace();
		}
		finally {
			// Step 3: Closing database connection
			try {
				if(null != connection) {
					// cleanup resources, once after processing
					statement.close();

					// and then finally close connection
					connection.close();
				}
			}
			catch (SQLException sqlex) {
				sqlex.printStackTrace();
			}
		}
	}
}

Output:

ID	Name			Age	Matches
==	================	===	=======
1	Sachin Tendulkar	43	200
8	Jacques Kallis	        40	166
11	Steve Waugh	 	50	168

 

4. Download:

 

Read Also:

 

References:

 

Happy Coding !!
Happy Learning !!

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