How to check the record in database exist or not if exist add to jtextarea else left blank (netbean) - netbeans-7

Question

Below is my code, which isn't working.
if can please provide example code or edit my code, TY
try {
Class.forName("com.mysql.jdbc.Driver");
con = DriverManager.getConnection("jdbc:mysql://localhost/timetable", "root", "");
String sql1 = "select * from tt where day like '%monday%'";
String sql = "select * from tt where time = 8 ";
pst = con.prepareStatement(sql);
pst = con.prepareStatement(sql1);
rs = pst.executeQuery();
if (rs.next()) {
String sC = rs.getString("subjectcode");
String sN = rs.getString("subjectname");
String Ln = rs.getString("lecturer");
monday8to10.setText(sC + newline + "" + sN + newline + "" + Ln);
} else {
monday8to10.setText("");
}
} catch (Exception e) {
JOptionPane.showMessageDialog(null, e);
}
try {
Class.forName("com.mysql.jdbc.Driver");
con = DriverManager.getConnection("jdbc:mysql://localhost/timetable", "root", "");
String sql1 = "select * from tt where day like '%monday%'";
String sql = "select * from tt where time = 10 ";
pst = con.prepareStatement(sql1);
pst = con.prepareStatement(sql);
rs = pst.executeQuery();
while (rs.next()) {
String sC = rs.getString("subjectcode");
String sN = rs.getString("subjectname");
String Ln = rs.getString("lecturer");
monday10to12.setText(sC + newline + "" + sN + newline + "" + Ln);
}
} catch (Exception e) {
JOptionPane.showMessageDialog(null, e);
}

Answer 1

I believe to start, pst.executeQuery() requires an argument. You are currently no executing a query at all?
pst.executeQuery(sql1);
Seconds, you need to execute 1 query at a time:
String sql1 = "select * from tt where day like '%monday%'";
String sql = "select * from tt where time = 10 ";
becomes
String sql1 = "select * from tt where time = 10 and day like '%monday%'";
For example, I was just looking back at some of my old DB code.
query = "SELECT m.title, m.year_, m.rt_picture, m.imdb_picture, m.movie_id, u.user_score, u.user_id FROM movie_navigator.movies m, movie_navigator.userratings u WHERE m.movie_id=u.movie_id AND u.movie_id=" + movieId + " LIMIT " + queryPageSize + " OFFSET " + (queryPageSize*pageNumber) + ";";
try{
stmt = conn.createStatement();
results = stmt.executeQuery(query);
while(results.next()){