compact.java

来自「非常棒的java数据库」· Java 代码 · 共 53 行

/*
 * Copyright 2004-2008 H2 Group. Licensed under the H2 License, Version 1.0
 * (license2)
 * Initial Developer: H2 Group
 */
package org.h2.samples;

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

import org.h2.tools.Script;
import org.h2.tools.DeleteDbFiles;
import org.h2.tools.RunScript;

/**
 * This sample application shows how to compact the database files.
 * This is done by creating a SQL script, and then re-creating the database
 * using this script.
 */
public class Compact {

    public static void main(String[] args) throws Exception {
        DeleteDbFiles.execute("data", "test", true);
        Class.forName("org.h2.Driver");
        Connection conn = DriverManager.getConnection("jdbc:h2:data/test", "sa", "");
        Statement stat = conn.createStatement();
        stat.execute("CREATE TABLE TEST(ID INT PRIMARY KEY, NAME VARCHAR)");
        stat.execute("INSERT INTO TEST VALUES(1, 'Hello'), (2, 'World');");
        conn.close();
        System.out.println("Compacting...");
        compact("data", "test", "sa", "");
        System.out.println("Done.");
    }

    /**
     * Utility method to compact a database.
     *
     * @param dir the directory
     * @param dbName the database name
     * @param user the user name
     * @param password the password
     */
    public static void compact(String dir, String dbName, String user, String password) throws SQLException {
        String url = "jdbc:h2:" + dir + "/" + dbName;
        String file = "data/test.sql";
        Script.execute(url, user, password, file);
        DeleteDbFiles.execute(dir, dbName, true);
        RunScript.execute(url, user, password, file, null, false);
    }
}