TestHSQLDB.java

/*
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 * and open the template in the editor.
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package examples;

/**
 *
 * @author Ricardo
 */

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

/**
 * Running a database in server mode:
 *
 * 	- java -cp ../lib/hsqldb.jar org.hsqldb.Server -database.0 file:mydb -dbname.0 xdb
 *
 * (de notar que o nome da base de dados não é indicado, mas é usado -database.0 e o nome que é
 * usado é xdb)
 *
 *  Correr a versão swing do Database Manager
 *
 *  - java -cp hsqldb.jar org.hsqldb.util.DatabaseManager
 *
 * @author Ricardo
 *
 */
public class TestHSQLDB {

	 static Connection conn;

	public TestHSQLDB(String db_file_name_prefix){
        // Load the HSQL Database Engine JDBC driver
        // hsqldb.jar should be in the class path or made part of the current jar
        try {
			Class.forName("org.hsqldb.jdbcDriver");
		} catch (ClassNotFoundException e1) {
			e1.printStackTrace();
		}

        // connect to the database.   This will load the db files and start the
        // database if it is not alread running.
        // db_file_name_prefix is used to open or create files that hold the state
        // of the db.
        // It can contain directory names relative to the
        // current working directory
        try {
			conn = DriverManager.getConnection("jdbc:hsqldb:hsql://localhost/xdb", "sa", "");
				/*DriverManager.getConnection("jdbc:hsqldb:"
			                                   + db_file_name_prefix,    // filenames
			                                   "sa",                     // username
			                                   "");*/
		} catch (SQLException e) {
			e.printStackTrace();
		}                      // password

	}

	public void shutdown() throws SQLException {

        Statement st = conn.createStatement();

        // db writes out to files and performs clean shuts down
        // otherwise there will be an unclean shutdown
        // when program ends
        st.execute("SHUTDOWN");
        conn.close();    // if there are no other open connection
    }

    public synchronized void query(String expression) throws SQLException {

        Statement st = null;
        ResultSet rs = null;

        st = conn.createStatement();         // statement objects can be reused with

        // repeated calls to execute but we
        // choose to make a new one each time
        rs = st.executeQuery(expression);    // run the query

        // do something with the result set.
        dump(rs);
        st.close();    // NOTE!! if you close a statement the associated ResultSet is

        // closed too
        // so you should copy the contents to some other object.
        // the result set is invalidated also  if you recycle an Statement
        // and try to execute some other query before the result set has been
        // completely examined.
    }

  //use for SQL commands CREATE, DROP, INSERT and UPDATE
    public synchronized void update(String expression) throws SQLException {

        Statement st = null;

        st = conn.createStatement();    // statements

        int i = st.executeUpdate(expression);    // run the query

        if (i == -1) {
            System.out.println("db error : " + expression);
        }

        st.close();
    }    // void update()

    public static void dump(ResultSet rs) throws SQLException {

        // the order of the rows in a cursor
        // are implementation dependent unless you use the SQL ORDER statement
        ResultSetMetaData meta   = rs.getMetaData();
        int               colmax = meta.getColumnCount();
        int               i;
        Object            o = null;

        // the result set is a cursor into the data.  You can only
        // point to one row at a time
        // assume we are pointing to BEFORE the first row
        // rs.next() points to next row and returns true
        // or false if there is no next row, which breaks the loop
        for (; rs.next(); ) {
            for (i = 0; i < colmax; ++i) {
                o = rs.getObject(i + 1);    // Is SQL the first column is indexed

                // with 1 not 0
                System.out.print(o.toString() + " ");
            }

            System.out.println(" ");
        }
    }                                       //void dump( ResultSet rs )

    public static void main(String[] args) {

        TestHSQLDB db = null;

        try {
            db = new TestHSQLDB("db_file");
        } catch (Exception ex1) {
            ex1.printStackTrace();    // could not start db

            return;                   // bye bye
        }

        try {

            //make an empty table
            //
            // by declaring the id column IDENTITY, the db will automatically
            // generate unique values for new rows- useful for row keys
            db.update(
                "CREATE TABLE sample_table ( id INTEGER IDENTITY, str_col VARCHAR(256), num_col INTEGER)");
        } catch (SQLException ex2) {

            //ignore
            //ex2.printStackTrace();  // second time we run program
            //  should throw execption since table
            // already there
            //
            // this will have no effect on the db
        }

        try {

            // add some rows - will create duplicates if run more then once
            // the id column is automatically generated
            db.update(
                "INSERT INTO sample_table(str_col,num_col) VALUES('Ford', 100)");
            db.update(
                "INSERT INTO sample_table(str_col,num_col) VALUES('Toyota', 200)");
            db.update(
                "INSERT INTO sample_table(str_col,num_col) VALUES('Honda', 300)");
            db.update(
                "INSERT INTO sample_table(str_col,num_col) VALUES('GM', 400)");

            // do a query
            db.query("SELECT * FROM sample_table WHERE num_col < 250");

            // at end of program
            db.shutdown();
        } catch (SQLException ex3) {
            ex3.printStackTrace();
        }
    }    // main()


}