jsp-DB

import java.sql.*;

public class DB {

public static Connection getConn() {

Connection conn = null;

try {

Class.forName("com.mysql.jdbc.Driver");

conn = DriverManager.getConnection("jdbc:mysql://localhost/shopping?user=root&password=1234");

} catch (ClassNotFoundException e) {

e.printStackTrace();

} catch (SQLException e) {

e.printStackTrace();

}

return conn;

}

public static PreparedStatement prepare(Connection conn, String sql) {

PreparedStatement pstmt = null;

try {

if(conn != null) {

pstmt = conn.prepareStatement(sql);

}

} catch (SQLException e) {

e.printStackTrace();

}

return pstmt;

}

public static PreparedStatement prepare(Connection conn, String sql, int autoGenereatedKeys) {

PreparedStatement pstmt = null;

try {

if(conn != null) {

pstmt = conn.prepareStatement(sql, autoGenereatedKeys);

}

} catch (SQLException e) {

e.printStackTrace();

}

return pstmt;

}

public static Statement getStatement(Connection conn) {

Statement stmt = null;

try {

if(conn != null) {

stmt = conn.createStatement();

}

} catch (SQLException e) {

e.printStackTrace();

}

return stmt;

}

/*

public static ResultSet getResultSet(Connection conn, String sql) {

Statement stmt = getStatement(conn);

ResultSet rs = getResultSet(stmt, sql);

close(stmt);

return rs;

}

*/

public static ResultSet getResultSet(Statement stmt, String sql) {

ResultSet rs = null;

try {

if(stmt != null) {

rs = stmt.executeQuery(sql);

}

} catch (SQLException e) {

e.printStackTrace();

}

return rs;

}

public static void executeUpdate(Statement stmt, String sql) {

try {

if(stmt != null) {

stmt.executeUpdate(sql);

}

} catch (SQLException e) {

e.printStackTrace();

}

}

public static void close(Connection conn) {

try {

if(conn != null) {

conn.close();

conn = null;

}

} catch (SQLException e) {

e.printStackTrace();

}

}

public static void close(Statement stmt) {

try {

if(stmt != null) {

stmt.close();

stmt = null;

}

} catch (SQLException e) {

e.printStackTrace();

}

}

public static void close(ResultSet rs) {

try {

if(rs != null) {

rs.close();

rs = null;

}

} catch (SQLException e) {

e.printStackTrace();

}

}

}