论文网站建设目标,安徽省城乡建设网站,小程序运营推广公司,怎么让网站栏目页收录XQuery创建BaseX数据库实例 文章目录 XQuery创建BaseX数据库实例1、准备工作2、demo目录结构3、IDEA配置BaseX4、工具类BaseXClient5、Example 1、准备工作
开发工具#xff1a;
IDEAOxygen
技术#xff1a;
JavaBaseXXpathXquery
BaseX需要阅读的文档#xff1a;
htt…XQuery创建BaseX数据库实例 文章目录 XQuery创建BaseX数据库实例1、准备工作2、demo目录结构3、IDEA配置BaseX4、工具类BaseXClient5、Example 1、准备工作
开发工具
IDEAOxygen
技术
JavaBaseXXpathXquery
BaseX需要阅读的文档
https://github.com/BaseXdb/basex/blob/9/basex-examples/src/main/java/org/basex/examples/api/Example.javahttps://docs.basex.org/wiki/Table_of_Contents
2、demo目录结构 Base X相当于一个工具类Example是我们写的创建XML数据库的例子。
3、IDEA配置BaseX 4、工具类BaseXClient
package com.linghu.util;import java.io.*;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.nio.charset.Charset;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.ArrayList;/*** Java client for BaseX.* Works with BaseX 7.0 and later** Documentation: https://docs.basex.org/wiki/Clients** (C) BaseX Team 2005-22, BSD License*/
public final class BaseXClient implements Closeable {/** UTF-8 charset. */private static final Charset UTF8 Charset.forName(UTF-8);/** Output stream. */private final OutputStream out;/** Input stream (buffered). */private final BufferedInputStream in;/** Socket. */private final Socket socket;/** Command info. */private String info;/*** Constructor.* param host server name* param port server port* param username user name* param password password* throws*/public BaseXClient(final String host, final int port, final String username,final String password) throws IOException {socket new Socket();socket.setTcpNoDelay(true);socket.connect(new InetSocketAddress(host, port), 5000);in new BufferedInputStream(socket.getInputStream());out socket.getOutputStream();// receive server responsefinal String[] response receive().split(:);final String code, nonce;if(response.length 1) {// support for digest authenticationcode username : response[0] : password;nonce response[1];} else {// support for cram-md5 (Version 8.0)code password;nonce response[0];}send(username);send(md5(md5(code) nonce));// receive success flagif(!ok()) throw new IOException(Access denied.);}/*** Executes a command and serializes the result to an output stream.* param command command* param output output stream* throws IOException Exception*/public void execute(final String command, final OutputStream output) throws IOException {// send {Command}0send(command);receive(in, output);info receive();if(!ok()) throw new IOException(info);}/*** Executes a command and returns the result.* param command command* return result* throws IOException Exception*/public String execute(final String command) throws IOException {final ByteArrayOutputStream os new ByteArrayOutputStream();execute(command, os);return new String(os.toByteArray(), UTF8);}/*** Creates a query object.* param query query string* return query* throws IOException Exception*/public Query query(final String query) throws IOException {return new Query(query);}/*** Creates a database.* param name name of database* param input xml input* throws IOException I/O exception*/public void create(final String name, final InputStream input) throws IOException {send(8, name, input);}/*** Adds a document to a database.* param path path to resource* param input xml input* throws IOException I/O exception*/public void add(final String path, final InputStream input) throws IOException {send(9, path, input);}/*** Replaces a document in a database.* param path path to resource* param input xml input* throws IOException I/O exception*/public void replace(final String path, final InputStream input) throws IOException {send(12, path, input);}/*** Stores a binary resource in a database.* param path path to resource* param input xml input* throws IOException I/O exception*/public void store(final String path, final InputStream input) throws IOException {send(13, path, input);}/*** Returns command information.* return string info*/public String info() {return info;}/*** Closes the session.* throws IOException Exception*/Overridepublic void close() throws IOException, IOException {send(exit);out.flush();socket.close();}/*** Checks the next success flag.* return value of check* throws IOException Exception*/private boolean ok() throws IOException {out.flush();return in.read() 0;}/*** Returns the next received string.* return String result or info* throws IOException I/O exception*/private String receive() throws IOException {final ByteArrayOutputStream os new ByteArrayOutputStream();receive(in, os);return new String(os.toByteArray(), UTF8);}/*** Sends a string to the server.* param string string to be sent* throws IOException I/O exception*/private void send(final String string) throws IOException {out.write((string \0).getBytes(UTF8));}/*** Receives a string and writes it to the specified output stream.* param input input stream* param output output stream* throws IOException I/O exception*/private static void receive(final InputStream input, final OutputStream output)throws IOException {for(int b; (b input.read()) 0;) {// read next byte if 0xFF is receivedoutput.write(b 0xFF ? input.read() : b);}}/*** Sends a command, argument, and input.* param code command code* param path name, or path to resource* param input xml input* throws IOException I/O exception*/private void send(final int code, final String path, final InputStream input) throws IOException {out.write(code);send(path);send(input);}/*** Sends an input stream to the server.* param input xml input* throws IOException I/O exception*/private void send(final InputStream input) throws IOException {final BufferedInputStream bis new BufferedInputStream(input);final BufferedOutputStream bos new BufferedOutputStream(out);for(int b; (b bis.read()) ! -1;) {// 0x00 and 0xFF will be prefixed by 0xFFif(b 0x00 || b 0xFF) bos.write(0xFF);bos.write(b);}bos.write(0);bos.flush();info receive();if(!ok()) throw new IOException(info);}/*** Returns an MD5 hash.* param pw String* return String*/private static String md5(final String pw) {final StringBuilder sb new StringBuilder();try {final MessageDigest md MessageDigest.getInstance(MD5);md.update(pw.getBytes());for(final byte b : md.digest()) {final String s Integer.toHexString(b 0xFF);if(s.length() 1) sb.append(0);sb.append(s);}} catch(final NoSuchAlgorithmException ex) {// should not occurex.printStackTrace();}return sb.toString();}/*** Inner class for iterative query execution.*/public class Query implements Closeable {/** Query id. */private final String id;/** Cached results. */private ArrayListbyte[] cache;/** Cache pointer. */private int pos;/*** Standard constructor.* param query query string* throws IOException I/O exception*/Query(final String query) throws IOException {id exec(0, query);}/*** Binds a value to an external variable.* param name name of variable* param value value* throws IOException I/O exception*/public void bind(final String name, final String value) throws IOException {bind(name, value, );}/*** Binds a value with the specified type to an external variable.* param name name of variable* param value value* param type type (can be an empty string)* throws IOException I/O exception*/public void bind(final String name, final String value, final String type) throws IOException {cache null;exec(3, id \0 name \0 value \0 type);}/*** Binds a value to the context item.* param value value* throws IOException I/O exception*/public void context(final String value) throws IOException {context(value, );}/*** Binds a value with the specified type to the context item.* param value value* param type type (can be an empty string)* throws IOException I/O exception*/public void context(final String value, final String type) throws IOException {cache null;exec(14, id \0 value \0 type);}/*** Checks for the next item.* return result of check* throws IOException I/O exception*/public boolean more() throws IOException {if(cache null) {out.write(4);send(id);cache new ArrayList();final ByteArrayOutputStream os new ByteArrayOutputStream();while(in.read() 0) {receive(in, os);cache.add(os.toByteArray());os.reset();}if(!ok()) throw new IOException(receive());pos 0;}if(pos cache.size()) return true;cache null;return false;}/*** Returns the next item.* return item string* throws IOException I/O Exception*/public String next() throws IOException {return more() ? new String(cache.set(pos, null), UTF8) : null;}/*** Returns the whole result of the query.* return query result* throws IOException I/O Exception*/public String execute() throws IOException {return exec(5, id);}/*** Returns query info in a string.* return query info* throws IOException I/O exception*/public String info() throws IOException {return exec(6, id);}/*** Returns serialization parameters in a string.* return query info* throws IOException I/O exception*/public String options() throws IOException {return exec(7, id);}/*** Closes the query.* throws IOException I/O exception*/Overridepublic void close() throws IOException {exec(2, id);}/*** Executes the specified command.* param code command code* param arg argument* return resulting string* throws IOException I/O exception*/private String exec(final int code, final String arg) throws IOException {out.write(code);send(arg);final String s receive();if(!ok()) throw new IOException(receive());return s;}}
}5、Example
接下来开始创建数据库
package com.linghu.util;import java.io.IOException;
import java.io.OutputStream;/*** This example shows how commands can be executed on a server.** This example requires a running database server instance.* Documentation: https://docs.basex.org/wiki/Clients** author BaseX Team 2005-22, BSD License*/
public final class Example {/*** Main method.* param args command-line arguments* throws IOException I/O exception*/public static void main(final String... args) throws IOException {// create sessiontry(BaseXClient session new BaseXClient(localhost, 1984, admin, admin)) {session.query(db:create(Zhang)).execute();}}
}
