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- package first.mysql;
- import java.sql.Connection;
- import java.sql.DriverManager;
- import java.sql.PreparedStatement;
- import java.sql.ResultSet;
- import java.sql.SQLException;
- import java.sql.Statement;
- import java.util.Date;
- public class MySQLAccess {
- private Connection connect = null;
- private Statement statement = null;
- private PreparedStatement preparedStatement = null;
- private ResultSet resultSet = null;
- public void readDataBase() throws Exception {
- try {
- // load the driver
- Class.forName("com.mysql.jdbc.Driver");
- // Setup the connection with the DB
- connect = DriverManager.getConnection("jdbc:mysql://localhost/" +
- "john?user=john&password=rainbows");
- // Statement to issue SQL queries to the database
- statement = connect.createStatement();
- // Result set get the result of the SQL query
- resultSet = statement.executeQuery(
- "select * from john.ex_comments");
- writeResultSet(resultSet);
- //PreparedStatement can use variables and are more efficient
- preparedStatement = connect.prepareStatement(
- "insert into john.ex_comments values (default," +
- ",?,?,?,?,?,?)");
- preparedStatement.setString(1, "Test");
- preparedStatement.setString(2, "TestEmail");
- preparedStatement.setString(3, "TestWebpage");
- preparedStatement.setDate(4, new java.sql.Date(2013, 04, 01));
- preparedStatement.setString(5, "TestSummary");
- preparedStatement.setString(6, "TestComment");
- preparedStatement.executeUpdate();
- // remove the inserted comment
- preparedStatement = connect.prepareStatement(
- "delete from john.ex_comments where myuser= ? ;");
- preparedStatement.setString(1, "Test");
- preparedStatement.executeUpdate();
- resultSet = statement.executeQuery("select * from john.ex_comments");
- writeMetaData(resultSet);
- } catch (Exception e) {
- throw e;
- } finally {
- close();
- }
- }
- private void writeMetaData(ResultSet resultSet) throws SQLException {
- System.out.println("The columns in the table are: ");
- System.out.println("Table: " + resultSet.getMetaData().getTableName(1));
- for (int i = 1; i <= resultSet.getMetaData().getColumnCount(); i++) {
- System.out.println("Column " + i + " " +
- resultSet.getMetaData().getColumnName(i));
- }
- }
- private void writeResultSet(ResultSet resultSet) throws SQLException {
- while (resultSet.next()) {
- String user = resultSet.getString("myuser");
- String website = resultSet.getString("wepage");
- String summary = resultSet.getString("summary");
- Date date = resultSet.getDate("datum");
- String comment = resultSet.getString("comments");
- System.out.println("User: " + user);
- System.out.println("Website: " + website);
- System.out.println("Summary: " + summary);
- System.out.println("Date: " + date);
- System.out.println("Comment: " + comment);
- }
- }
- private void close() {
- try {
- if (resultSet != null) resultSet.close();
- if (statement != null) statement.close();
- if (connect != null) connect.close();
- } catch (Exception e) {
- }
- }
- }
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