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DatabaseConnection.java
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DatabaseConnection.java
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import java.sql.CallableStatement;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
/**
* DatabaseConnection.java
*
* This class is used to connect to the database.
*
* @author Shivalik
*
*/
public class DatabaseConnection {
public ResultSet rs;
protected Connection conn;
protected PreparedStatement pst;
protected Statement stmt;
/*
* DatabaseConnection()
*/
public DatabaseConnection(String URL, String driver, String user,
String password) {
try {
Class.forName(driver);
System.out.println("Connecting to database...");
conn = DriverManager.getConnection(URL, user, password);
} catch (Exception e) {
e.printStackTrace();
}
}
/*
* executeQuery()
*/
public ResultSet executeQuery(String sql, String value1, String value2) {
try {
pst = conn.prepareStatement(sql, ResultSet.TYPE_SCROLL_SENSITIVE,
ResultSet.CONCUR_UPDATABLE);
// to assign the argument passed in the TestConnection class to the
// "app_num" in SQL Query
pst.setString(1, value1);
pst.setString(2, value2);
return pst.executeQuery();
} catch (Exception e) {
System.out.println("Error in Command \n" + e);
e.printStackTrace();
}
return null;
}
public void executeArchive(String date) throws SQLException
{
CallableStatement cs = conn.prepareCall("{call archive_history(?)}");
cs.setString(1,date);
cs.executeUpdate();
}
public void executeUpdate(String query) throws SQLException {
try {
pst.executeUpdate(query);
} catch (Exception e) {
System.out.println("Error in Command\n" + e);
e.printStackTrace();
}
}
/*
* execute()
*/
public ResultSet execute(String sql) {
try {
pst = conn.prepareStatement(sql, ResultSet.TYPE_SCROLL_SENSITIVE,
ResultSet.CONCUR_UPDATABLE);
return pst.executeQuery();
} catch (Exception e) {
System.out.println("Error in Command\n" + e);
e.printStackTrace();
}
return null;
}
/*
* closeConnection()
*/
public void closeConnection() {
if (rs != null) {
try {
rs.close();
} catch (SQLException e) {
}
}
if (pst != null) {
try {
pst.close();
} catch (SQLException e) {
}
}
if (conn != null) {
try {
conn.close();
} catch (SQLException e) {
}
}
}
}