[英]Java - Out of Bounds Exception Database
I am practicing Java before the semester starts, and I trying to create code that will read in a specified CSV file, and create a database with it. 我在学期开始之前正在练习Java,并且尝试创建将在指定的CSV文件中读取的代码,并使用它创建数据库。 But I am getting an error that says
但是我得到一个错误,说
"Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 3 “线程“主”中的异常” java.lang.ArrayIndexOutOfBoundsException:3
at LoadData.main(LoadKids.java:52)" 在LoadData.main(LoadKids.java:52)“
My code is listed below. 我的代码在下面列出。
The error is on this line "Rating = fields[3].trim();" 该行的错误是“ Rating = fields [3] .trim();”
import java.io.File;
import java.io.FileNotFoundException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Scanner;
public class LoadData {
public static void main(String[] args) {
Connection c = null;
Statement s = null;
Scanner fromFile = null;
String sql1 = null, sql2 = null;
String line = null, ID = null, Console = null, Title = null, Rating = null, Multiplayer = null;
String[ ] fields;
try {
// Define Connection and Statement objects.
Class.forName("org.sqlite.JDBC");
c = DriverManager.getConnection("jdbc:sqlite:games.db");
s = c.createStatement();
// Instantiate scanner to read from file.
fromFile = new Scanner(new File ("FileName.csv"));
// Create the table.
sql1 = "create table if not exists " +
"games(gameid integer, " +
"ID varchar(2), " +
"Console varchar(15), " +
"Title varchar(20), " +
"Rating varchar(2), " +
"Multiplayer varchar(3));";
System.out.println("sql1: " + sql1);
s.executeUpdate(sql1);
// Read and throw away header line.
fromFile.nextLine( );
// Populate the table.
for (int id = 1001; fromFile.hasNextLine( ); id++) {
line = fromFile.nextLine( );
fields = line.split(" ");
ID = fields[0].trim();
Console = fields[1].trim();
Title = fields[2].trim();
Rating = fields[3].trim();
Multiplayer = fields[4].trim();
sql2 = String.format(
"insert into games (gameid, ID, Console, Title, Rating, Multiplayer) " +
"values (%d, '%s', '%s', '%s', '%s', '%s');",
id, ID, Console, Title, Rating, Multiplayer);
System.out.println(sql2);
s.executeUpdate(sql2);
}
c.close( );
}
catch (FileNotFoundException e) {
System.out.println("File queries.sql not found.");
System.err.println( e.getClass().getName() +
": " + e.getMessage() );
}
catch(SQLException e) {
System.out.println("SQLException.");
System.err.println( e.getClass().getName() +
": " + e.getMessage() );
}
catch (ClassNotFoundException e ) {
System.err.println( e.getClass().getName() +
": " + e.getMessage() );
}
finally {
fromFile.close( );
}
}
}
Please post the data in your csv file. 请将数据发布到您的csv文件中。 Normally CSV files are separated by commas, hence the name comma separated values.
通常,CSV文件用逗号分隔,因此名称用逗号分隔。 However, you code is using a space to separate the values.
但是,您的代码使用空格分隔值。
fields = line.split(" ");
If your CSV data is really separated by commas, change that line to 如果您的CSV数据确实用逗号分隔,请将该行更改为
fields = line.split(",");
If your CSV data is separated by spaces, verify there are at least 5 items separated by spaces on every line in the file. 如果您的CSV数据用空格分隔,请确认文件中的每一行至少有5个项目用空格分隔。
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