adding之后从文件到 BaseX 的有效 XML，现在如何从 String 添加有效的 XML？
thufir@dur:~/NetBeansProjects/twitterBaseX$
thufir@dur:~/NetBeansProjects/twitterBaseX$ basex
BaseX 9.0.1 [Standalone]
Try 'help' to get more information.
>
> list
Name Resources Size Input Path
-------------------------------------------------------------------------------
com.w3schools.books 1 6290 https://www.w3schools.com/xml/books.xml
db 1 101838
twitter 0 4570
w3school_data 1 5209 https://www.w3schools.com/xml/note.xml
4 database(s).
>
> drop database twitter
Database 'twitter' was dropped.
>
> exit
Have fun.
thufir@dur:~/NetBeansProjects/twitterBaseX$
thufir@dur:~/NetBeansProjects/twitterBaseX$ gradle clean run
> Task :run FAILED
/home/thufir/basex/.basex: writing new configuration file.
Feb. 03, 2020 2:23:10 A.M. basex.DatabaseHelper add
INFO: <?xml version="1.0" encoding="UTF-8"?><root><metadata><result_type>recent</result_type><iso_language_code>und</iso_language_code></metadata><in_reply_to_status_id_str>1223800963196162049</in_reply_to_status_id_str><in_reply_to_status_id>1223800963196162049</in_reply_to_status_id><created_at>Mon Feb 03 07:50:03 +0000 2020</created_at><in_reply_to_user_id_str>60919433</in_reply_to_user_id_str><source><a href="http://twitter.com/download/iphone" rel="nofollow">Twitter for iPhone</a></source><retweet_count>0</retweet_count><retweeted>false</retweeted><geo>null</geo><in_reply_to_screen_name>lizardbill</in_reply_to_screen_name><is_quote_status>false</is_quote_status><id_str>1224238604437733378</id_str><in_reply_to_user_id>60919433</in_reply_to_user_id><favorite_count>0</favorite_count><id>1224238604437733378</id><text>@lizardbill 👍😊 excised url</text><place>null</place><lang>und</lang><favorited>false</favorited><possibly_sensitive>false</possibly_sensitive><coordinates>null</coordinates><truncated>false</truncated><entities><urls><display_url>shop.yang2020.com</display_url><indices>15</indices><indices>38</indices><expanded_url>http://shop.yang2020.com</expanded_url><url>excised</url></urls><user_mentions><indices>0</indices><indices>11</indices><screen_name>lizardbill</screen_name><id_str>60919433</id_str><name>Bill the Lizard</name><id>60919433</id></user_mentions></entities><contributors>null</contributors><user><utc_offset>null</utc_offset><friends_count>197</friends_count><profile_image_url_https>https://pbs.twimg.com/profile_images/1208330461518237696/GOo2AZX1_normal.jpg</profile_image_url_https><listed_count>1</listed_count><profile_background_image_url>null</profile_background_image_url><default_profile_image>false</default_profile_image><favourites_count>11211</favourites_count><description>WE NEED ALL HANDS ON DECK! #YangGang Quick-Start Guide: excised + @IowaforYang @TeamYangNH @SCforYang @NevadaforYang 👈</description><created_at>Wed Jul 17 04:44:43 +0000 2019</created_at><is_translator>false</is_translator><profile_background_image_url_https>null</profile_background_image_url_https><protected>false</protected><screen_name>humansforyang</screen_name><id_str>1151352001579511808</id_str><profile_link_color>1DA1F2</profile_link_color><is_translation_enabled>false</is_translation_enabled><translator_type>none</translator_type><id>1151352001579511808</id><geo_enabled>false</geo_enabled><profile_background_color>F5F8FA</profile_background_color><lang>null</lang><has_extended_profile>false</has_extended_profile><profile_sidebar_border_color>C0DEED</profile_sidebar_border_color><profile_text_color>333333</profile_text_color><verified>false</verified><profile_image_url>http://pbs.twimg.com/profile_images/1208330461518237696/GOo2AZX1_normal.jpg</profile_image_url><time_zone>null</time_zone><url>excisted</url><contributors_enabled>false</contributors_enabled><profile_background_tile>false</profile_background_tile><profile_banner_url>https://pbs.twimg.com/profile_banners/1151352001579511808/1576927762</profile_banner_url><entities><description><urls><display_url>bit.ly/welcome_to_the…</display_url><indices>56</indices><indices>79</indices><expanded_url>excised </expanded_url><url>edited</url></urls></description><url><urls><display_url>yang2020.com/what-is-freedo…</display_url><indices>0</indices><indices>23</indices><expanded_url>https://www.yang2020.com/what-is-freedom-dividend-faq/</expanded_url><url>excised</url></urls></url></entities><statuses_count>4503</statuses_count><follow_request_sent>false</follow_request_sent><followers_count>410</followers_count><profile_use_background_image>true</profile_use_background_image><default_profile>true</default_profile><following>false</following><name>Humans for Yang 🧢</name><location>UBI FAQ 👉</location><profile_sidebar_fill_color>DDEEF6</profile_sidebar_fill_color><notifications>false</notifications></user></root>
Exception in thread "main" org.basex.core.BaseXException: Name '' is invalid.
at org.basex.core.Command.execute(Command.java:94)
at org.basex.core.Command.execute(Command.java:116)
at basex.DatabaseHelper.add(DatabaseHelper.java:83)
at basex.DatabaseHelper.dropCreateAdd(DatabaseHelper.java:91)
at main.App.twitterToBaseX(App.java:24)
at main.App.main(App.java:28)
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':run'.
> Process 'command '/home/thufir/.sdkman/candidates/java/12.0.1-zulu/bin/java'' finished with non-zero exit value 1
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
* Get more help at https://help.gradle.org
BUILD FAILED in 2s
4 actionable tasks: 4 executed
thufir@dur:~/NetBeansProjects/twitterBaseX$
thufir@dur:~/NetBeansProjects/twitterBaseX$
constructor对于添加:
Add public Add(java.lang.String path, java.lang.String input) Constructor, specifying a target path and an input. Parameters: path - target path, optionally terminated by a new file name. If null, the name of the input will be set as path. input - input file or XML string
代码:
package basex;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Properties;
import java.util.logging.Logger;
import org.basex.core.BaseXException;
import org.basex.core.Context;
import org.basex.core.cmd.Add;
import org.basex.core.cmd.Open;
import org.basex.core.cmd.CreateDB;
import org.basex.core.cmd.DropDB;
import org.basex.core.cmd.List;
import org.basex.core.cmd.Set;
import org.json.XML;
import twitter4j.JSONArray;
import twitter4j.JSONException;
public class DatabaseHelper {
private static final Logger log = Logger.getLogger(DatabaseHelper.class.getName());
private Properties properties = new Properties();
private URL url = null;
private String databaseName = null;
private Context context = null;
private String parserType = null;
private DatabaseHelper() {
}
public DatabaseHelper(Properties properties) {
this.properties = properties;
}
private String wrap(String string) {
StringBuilder stringBuilder = new StringBuilder();
stringBuilder.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
stringBuilder.append("<root>");
stringBuilder.append(string);
stringBuilder.append("</root>");
return stringBuilder.toString();
}
private void init() throws MalformedURLException, BaseXException {
log.fine(properties.toString());
parserType = properties.getProperty("parserType");
url = new URL(properties.getProperty(parserType + "URL"));
databaseName = properties.getProperty("databaseName");
context = new Context();
list();
}
private void list() throws BaseXException {
log.fine(new List().execute(context));
}
private void drop() throws BaseXException {
new Set("parser", parserType).execute(context);
new DropDB(databaseName).execute(context);
list();
}
private void create() throws BaseXException, JSONException {
new Set("parser", parserType).execute(context);
new CreateDB(databaseName).execute(context);
new List().execute(context);
list();
}
private void add(JSONArray tweets) throws JSONException, BaseXException {
long id = 0L;
String jsonStringTweet = null;
org.json.JSONObject jsonObjectTweet = null;
String stringXml = null;
new Open(databaseName).execute(context);
for (int i = 0; i < tweets.length(); i++) {
jsonStringTweet = tweets.get(i).toString();
jsonObjectTweet = new org.json.JSONObject(jsonStringTweet);
stringXml = XML.toString(jsonObjectTweet);
stringXml = wrap(stringXml);
log.info(stringXml);
new Add(null, stringXml).execute(context);
}
}
public void dropCreateAdd(JSONArray tweets) throws MalformedURLException, BaseXException, JSONException {
init();
drop();
create();
add(tweets);
list();
}
}
我添加了 wrap 方法，以便生成的 String 通过 validation如:
The XML document is valid.
话虽如此，我什至不确定错误引用的“名称”是什么。数据库？字符串？同样，在传递 XML 文件的路径时它工作得很好 - 而且我认为我正在按照此构造函数的说明传递字符串。
最佳答案
它可以从文件中添加 XML，如下所示:
thufir@dur:~/NetBeansProjects/twitterBaseX$
thufir@dur:~/NetBeansProjects/twitterBaseX$ ll
total 92
drwxr-xr-x 6 thufir thufir 4096 Feb 3 13:50 ./
drwxr-xr-x 22 thufir thufir 4096 Feb 1 16:05 ../
-rw-rw-r-- 1 thufir thufir 1979 Feb 1 21:17 build.gradle
-rw-rw-r-- 1 thufir thufir 219 Feb 3 01:04 data.xml
drwxr-xr-x 8 thufir thufir 4096 Feb 3 13:50 .git/
-rw-r--r-- 1 thufir thufir 427 Feb 1 16:22 .gitignore
drwxrwxr-x 6 thufir thufir 4096 Jan 30 00:26 .gradle/
drwxrwxr-x 3 thufir thufir 4096 Jan 30 00:24 gradle/
-rwxrwxr-x 1 thufir thufir 5916 Jan 30 00:24 gradlew*
-rw-rw-r-- 1 thufir thufir 2941 Jan 30 00:24 gradlew.bat
-rw-r--r-- 1 thufir thufir 35149 Jan 30 00:22 LICENSE
-rw-r--r-- 1 thufir thufir 51 Jan 30 00:22 README.md
-rw-rw-r-- 1 thufir thufir 361 Jan 31 21:55 settings.gradle
drwxrwxr-x 4 thufir thufir 4096 Jan 30 00:24 src/
thufir@dur:~/NetBeansProjects/twitterBaseX$
thufir@dur:~/NetBeansProjects/twitterBaseX$ basex
BaseX 9.0.1 [Standalone]
Try 'help' to get more information.
>
> list
Name Resources Size Input Path
-----------------------------------------------------------------------------
com.w3schools.books 1 6290 https://www.w3schools.com/xml/books.xml
w3school_data 1 5209 https://www.w3schools.com/xml/note.xml
2 database(s).
>
> exit
Enjoy life.
thufir@dur:~/NetBeansProjects/twitterBaseX$
thufir@dur:~/NetBeansProjects/twitterBaseX$ gradle clean run
> Task :run
/home/thufir/basex/.basex: writing new configuration file.
BUILD SUCCESSFUL in 3s
4 actionable tasks: 3 executed, 1 up-to-date
thufir@dur:~/NetBeansProjects/twitterBaseX$
thufir@dur:~/NetBeansProjects/twitterBaseX$ basex
/home/thufir/basex/.basex: Unknown option 'RESTXQERRORS'.
/home/thufir/basex/.basex: writing new configuration file.
BaseX 9.0.1 [Standalone]
Try 'help' to get more information.
>
> list
Name Resources Size Input Path
------------------------------------------------------------------------------
com.w3schools.books 1 6290 https://www.w3schools.com/xml/books.xml
twitter 15 73551
w3school_data 1 5209 https://www.w3schools.com/xml/note.xml
3 database(s).
>
> open twitter
Database 'twitter' was opened in 63.63 ms.
>
> xquery /
<root>
<metadata>
<result_type>recent</result_type>
...
<notifications>false</notifications>
</user>
<favorited>false</favorited>
</root>
Query executed in 292.16 ms.
>
> exit
Enjoy life.
thufir@dur:~/NetBeansProjects/twitterBaseX$
来源:
package basex;
import java.io.FileWriter;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Properties;
import java.util.logging.Logger;
import org.basex.core.BaseXException;
import org.basex.core.Context;
import org.basex.core.cmd.Open;
import org.basex.core.cmd.CreateDB;
import org.basex.core.cmd.DropDB;
import org.basex.core.cmd.List;
import org.basex.core.cmd.Set;
import org.json.XML;
import twitter4j.JSONArray;
import twitter4j.JSONException;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Paths;
import org.basex.core.cmd.Add;
public class DatabaseHelper {
private static final Logger log = Logger.getLogger(DatabaseHelper.class.getName());
private Properties properties = new Properties();
private URL url = null;
private String databaseName = null;
private Context context = null;
private String parserType = null;
private DatabaseHelper() {
}
public DatabaseHelper(Properties properties) {
this.properties = properties;
}
private String wrap(String string) {
StringBuilder stringBuilder = new StringBuilder();
stringBuilder.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
stringBuilder.append("<root>");
stringBuilder.append(string);
stringBuilder.append("</root>");
return stringBuilder.toString();
}
private void init() throws MalformedURLException, BaseXException {
log.fine(properties.toString());
parserType = properties.getProperty("parserType");
url = new URL(properties.getProperty(parserType + "URL"));
databaseName = properties.getProperty("databaseName");
context = new Context();
list();
}
private void list() throws BaseXException {
log.fine(new List().execute(context));
}
private void drop() throws BaseXException {
new Set("parser", parserType).execute(context);
new DropDB(databaseName).execute(context);
list();
}
private void create() throws BaseXException, JSONException {
new Set("parser", parserType).execute(context);
new CreateDB(databaseName).execute(context);
new List().execute(context);
list();
}
private void add(JSONArray tweets) throws JSONException, BaseXException, IOException {
long id = 0L;
String jsonStringTweet = null;
org.json.JSONObject jsonObjectTweet = null;
String stringXml = null;
String fileName = "tweet.xml";
new Open(databaseName).execute(context);
for (int i = 0; i < tweets.length(); i++) {
jsonStringTweet = tweets.get(i).toString();
jsonObjectTweet = new org.json.JSONObject(jsonStringTweet);
stringXml = XML.toString(jsonObjectTweet);
stringXml = wrap(stringXml);
write(stringXml,fileName);
String stringFromFile = read(fileName);
log.fine(stringFromFile);
new Add(fileName, stringXml).execute(context);
}
}
public void dropCreateAdd(JSONArray tweets) throws MalformedURLException, BaseXException, JSONException, IOException {
init();
drop();
create();
add(tweets);
list();
}
private void write(String tweet, String fileName) throws IOException {
log.fine(tweet);
FileWriter fileWriter = new FileWriter(fileName);
fileWriter.write(tweet);
fileWriter.close();
}
private String read(String fileName) throws IOException {
String content = new String(Files.readAllBytes(Paths.get(fileName)), StandardCharsets.UTF_8);
return content;
}
}
但这并没有显示如何将字符串 XML 添加到数据库。
关于java - 无法将字符串添加到数据库 : BaseXException: Name '' is invalid，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/60037481/