Question

我在使用带有Java的sqlite时遇到了问题。我的应用程序，在第一次启动时，在文件夹中创建一个文件夹，其中是jar文件，并在该文件夹中放置我的sqlite db;问题是，当我从Netbeans运行我的项目时，一切正常，没有任何问题，但是当我构建jar并尝试从中创建它时，应用程序创建文件夹但不创建内部数据库，程序崩溃。为什么？这是我创建数据库及其文件夹的代码：

public Db()
{
    if (!checker())
    {
        File f = new File("dbecprp");
        f.mkdir();
        try {
            String url = "jdbc:sqlite:dbecprp/dbecprp.db";
            Class.forName("org.sqlite.JDBC");
            conn = (Connection)DriverManager.getConnection(url);
            s = conn.createStatement();
            s.executeUpdate("CREATE TABLE Utente (idUtente integer primary key autoincrement, nome varchar(45) not null, email varchar(45) not null, password varchar(15) not null);");
            s.executeUpdate("CREATE TABLE Prodotto (idProdotto integer primary key autoincrement, tipologia varchar(3) not null, titolo varchar(45) not null, creatore varchar(45) not null, prezzo float not null, descrizione varchar(45), qta_magazzino int(3) not null);");
            s.executeUpdate("CREATE TABLE Ordine (idOrdine integer primary key autoincrement, qta_prodotto int(3) not null, totale_ordine float not null, data_ordine long not null, nome_consegna varchar(45) not null, indirizzo_spedizione varchar(150) not null, idUtente int not null, idProdotto int not null, FOREIGN KEY (idUtente) REFERENCES Utente(idUtente), FOREIGN KEY (idProdotto) REFERENCES Prodotto(idProdotto));");
        } catch (ClassNotFoundException | SQLException ex) {
            JOptionPane.showMessageDialog(null, "Db creation failed. Program will terminate.");
            System.exit(1);
        }
        filler();
    }
}

public boolean checker()
{
    File f = new File("dbecprp");
    return f.isDirectory();
}

这是清洁和构建输出：

    ant -f C:\\Users\\paolo2\\Documents\\NetBeansProjects\\Server clean jar
init:
deps-clean:
Updating property file: C:\Users\paolo2\Documents\NetBeansProjects\Server\build\built-clean.properties
Deleting directory C:\Users\paolo2\Documents\NetBeansProjects\Server\build
clean:
init:
deps-jar:
Created dir: C:\Users\paolo2\Documents\NetBeansProjects\Server\build
Updating property file: C:\Users\paolo2\Documents\NetBeansProjects\Server\build\built-jar.properties
Created dir: C:\Users\paolo2\Documents\NetBeansProjects\Server\build\classes
Created dir: C:\Users\paolo2\Documents\NetBeansProjects\Server\build\empty
Created dir: C:\Users\paolo2\Documents\NetBeansProjects\Server\build\generated-sources\ap-source-output
Compiling 4 source files to C:\Users\paolo2\Documents\NetBeansProjects\Server\build\classes
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
compile:
Created dir: C:\Users\paolo2\Documents\NetBeansProjects\Server\dist
Copying 1 file to C:\Users\paolo2\Documents\NetBeansProjects\Server\build
Not copying library C:\Users\paolo2\Documents\NetBeansProjects\Server\dist\lib\sqlite-jdbc-3.7.2.jar , it can't be read.
Copy libraries to C:\Users\paolo2\Documents\NetBeansProjects\Server\dist\lib.
Building jar: C:\Users\paolo2\Documents\NetBeansProjects\Server\dist\Server.jar
To run this application from the command line without Ant, try:
java -jar "C:\Users\paolo2\Documents\NetBeansProjects\Server\dist\Server.jar"
jar:
BUILD SUCCESSFUL (total time: 7 seconds)

也许问题是没有包含的sqlite-jdbc-3.7.2.jar ...我曾经手动添加它，但也许因为它不起作用。

Answer 1

名为 dbecprp.db 的数据库不会自动创建

您需要将 dbecprp.db 放在项目目录 dbecprp文件夹中

依旧......

为什么我的sqlite数据库没有创建？

1 个答案: