[英]Derby Database insertion error
我正在編寫一個代碼,它可以很好地在輸出屏幕上顯示輸出。 但是,當我將數據庫鏈接到它時,它會出現某種類型的錯誤,我在Google上進行了很多搜索,但無法獲得幫助。
import java.net.URL;
import java.io.*;
import java.util.ArrayList;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
public class Test{
public ArrayList lines=new ArrayList();// global list contain <item>.......</item>
public static void main(String[] args) throws Exception {
Test obj= new Test();
/* String proxy="172.16.4.7"; //proxy address
String port= "1117"; //proxy port
System.setProperty("http.proxyHost" , proxy); //setting proxy
System.setProperty("http.proxyPort", port); //setting proxy port
*/
URL url = new URL("http://feeds.feedburner.com/geo/GiKR"); //geo url
BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream()));
String line;
line=in.readLine(); //skiping first line of xml version
line= in.readLine();
if (line.contains("<item>")) {
while(line.contains("<item>")) {
line = obj.extractItem(line); //extraction <item>a nd </item> from origional news feed
}
}
}
String extractItem(String line){
int start=0, end=0,length=0;
start= line.indexOf("<item>");
end= line.indexOf("</item>");
length= line.length();
try{
String host = "jdbc:derby://localhost:1527/NewsFinal";
String uName="ashfaq";
String pass="pakistan";
Connection con = DriverManager.getConnection( host, uName, pass );
Statement stmt= con.createStatement();
//lines.add(line.substring(start+6, end));
String item=line.substring(start+6, end+7);
//System.out.println(item);
//String query="INSERT INTO ITEMS2(ITEM) VALUES(" + "'"+item+"'"+")";
String query="insert into ITEMS(ITEMDATA) values("+"'" + item + "'"+")";
stmt.executeUpdate(query);
}
catch(SQLException err)
{System.out.println(err.getMessage());}
//System.out.println(line.substring(start+6, end+7)); //strat+6 to remove item tag, start+13 removes item and title tag
return line.substring(0,start) + line.substring(end+6,length);
}
}
這是它生成的輸出:
run:
Syntax error: Encountered "1" at line 1, column 318.
Syntax error: Encountered "1" at line 1, column 330.
Syntax error: Encountered "1" at line 1, column 342.
Syntax error: Encountered "1" at line 1, column 318.
Syntax error: Encountered "1" at line 1, column 330.
Syntax error: Encountered "1" at line 1, column 326.
Syntax error: Encountered "1" at line 1, column 351.
Syntax error: Encountered "1" at line 1, column 319.
Syntax error: Encountered "1" at line 1, column 299.
Syntax error: Encountered "1" at line 1, column 328.
Syntax error: Encountered "1" at line 1, column 307.
Syntax error: Encountered "1" at line 1, column 331.
Syntax error: Encountered "1" at line 1, column 334.
Syntax error: Encountered "1" at line 1, column 319.
Syntax error: Encountered "1" at line 1, column 334.
Syntax error: Encountered "1" at line 1, column 307.
Syntax error: Encountered "1" at line 1, column 325.
Syntax error: Encountered "1" at line 1, column 301.
Syntax error: Encountered "1" at line 1, column 312.
Syntax error: Encountered "1" at line 1, column 306.
Syntax error: Encountered "1" at line 1, column 327.
Syntax error: Encountered "1" at line 1, column 342.
Syntax error: Encountered "1" at line 1, column 333.
Syntax error: Encountered "1" at line 1, column 338.
Syntax error: Encountered "1" at line 1, column 329.
BUILD SUCCESSFUL (total time: 3 seconds)
在函數extractItem(String line)
,當我取消注釋時
System.out.println(item);
它顯示輸出很好,但不能插入我用它創建的數據庫中。
數據庫運行良好,我從gui中向其中插入了數據,它也可以從execute命令正常工作,但不知道為什么會出現此錯誤。
僅在雙引號周圍加上引號還不足以使它作為VALUE(如果它包含另一個引號)並讓您容易受到SQL Injection攻擊的影響。
使用PreparedStatement
並在其中設置值。
您還將為每個項目創建一個新的Connection
和Statement
,而不關閉其中的任何一個。
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