testpreparedsubqueries.java

hsqldb是100％java实现的数据库,是一个开放源代码的JAVA数据库 l 具有标准的SQL语法和JAVA接口 l HSQLDB可以自由使用和分发 l 非常简洁和快速的

/* Copyright (c) 2001-2005, The HSQL Development Group
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 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of the HSQL Development Group nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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package org.hsqldb.test;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.Statement;

/**
 * @author kloska@users
 */
class TestPreparedSubQueries {

    private Connection con = null;

    private class sqlStmt {

        boolean prepare;
        boolean update;
        String  command;

        sqlStmt(String c, boolean p, boolean u) {

            prepare = p;
            command = c;
            update  = u;
        }
    }
    ;

    private sqlStmt[] stmtArray = {
        new sqlStmt("drop table a if exists", false, false),
        new sqlStmt("create cached table a (a int identity,b int)", false,
                    false),
        new sqlStmt("create index bIdx on a(b)", false, false),
        new sqlStmt("insert into a(b) values(1)", true, true),
        new sqlStmt("insert into a(b) values(2)", true, true),
        new sqlStmt("insert into a(b) values(3)", true, true),
        new sqlStmt("insert into a(b) values(4)", true, true),
        new sqlStmt("insert into a(b) values(5)", true, true),
        new sqlStmt("insert into a(b) values(6)", true, true),
        new sqlStmt(
            "update a set b=100 where b>(select b from a X where X.a=2)",
            true, true),
        new sqlStmt("update a set b=200 where b>(select b from a where a=?)",
                    true, true),
        new sqlStmt(
            "update a set b=300 where b>(select b from a X where X.a=?)",
            true, true)
    };
    private Object[][] stmtArgs = {
        {}, {}, {}, {}, {}, {}, {}, {}, {}, {}, { new Integer(2) },
        { new Integer(2) }
    };

    public static void main(String[] argv) {

        Connection con = null;

        try {
            String url = "jdbc:hsqldb:test";

            Class.forName("org.hsqldb.jdbcDriver");

            con = java.sql.DriverManager.getConnection(url, "sa", "");

            System.out.println("SciSelect::connect -- connected to '" + url
                               + "'");
        } catch (Exception e) {
            System.out.println(" ?? main: Caught Exception " + e);
            System.out.println(" - FAILED - ");

            return;
        }

        TestPreparedSubQueries t = new TestPreparedSubQueries(con);
        boolean                b = t.test();

        System.out.println(b ? " -- OK -- "
                             : " ?? FAILED ?? ");
        System.exit(0);
    }

    public TestPreparedSubQueries(Connection c) {
        con = c;
    }

    public boolean test() {

        try {
            int i = 0;

            for (i = 0; i < stmtArray.length; i++) {
                int j;

                System.out.println(" -- #" + i + " ----------------------- ");

                if (stmtArray[i].prepare) {
                    PreparedStatement ps = null;

                    System.out.println(" -- preparing\n<<<\n"
                                       + stmtArray[i].command + "\n>>>\n");

                    ps = con.prepareStatement(stmtArray[i].command);

                    System.out.print(" -- setting " + stmtArgs[i].length
                                     + " Args [");

                    for (j = 0; j < stmtArgs[i].length; j++) {
                        System.out.print((j > 0 ? "; "
                                                : "") + stmtArgs[i][j]);
                        ps.setObject(j + 1, stmtArgs[i][j]);
                    }

                    System.out.println("]");
                    System.out.println(" -- executing ");

                    if (stmtArray[i].update) {
                        int r = ps.executeUpdate();

                        System.out.println(" ***** ps.executeUpdate gave me "
                                           + r);
                    } else {
                        boolean b = ps.execute();

                        System.out.print(" ***** ps.execute gave me " + b);
                    }
                } else {
                    System.out.println(" -- executing directly\n<<<\n"
                                       + stmtArray[i].command + "\n>>>\n");

                    Statement s = con.createStatement();
                    boolean   b = s.execute(stmtArray[i].command);

                    System.out.println(" ***** st.execute gave me " + b);
                }
            }
        } catch (Exception e) {
            System.out.println(" ?? Caught Exception " + e);

            return false;
        }

        return true;
    }
}