jdbc 在 javafx 应用程序中使用嵌入式 derby：Table/View 'TABLE NAME' 不存在异常

Question

我正在创建一个 JavaFX 独立应用程序并使用嵌入式 derby 数据库并通过 JDBC 连接到它。问题是每当我尝试与数据库 tables 交互时，我得到 "java.sql.SQLSyntaxErrorException: Table/View 'BUILDINGS' does not exist."。

我找了很多，还是解决不了。我查了这三个原因here, but I'm still getting the same error. This post 听起来和我的情况很相似，但我不知道他是如何解决的。我已经从连接元数据和 netbeans 服务选项卡检查了数据库 URL，结果是一样的。

以下是与问题相关的代码片段：

public class DataBaseUtility {

public Connection derbyDBConnection(String url){
    Connection con = null;

    String driver = "org.apache.derby.jdbc.EmbeddedDriver";
    try {
        Class.forName(driver).newInstance();
        con = DriverManager.getConnection(url, "", "");
        con.setSchema("APP");
    } catch (ClassNotFoundException | SQLException | 
            InstantiationException | IllegalAccessException ex) {
        Logger.getLogger(DataBaseUtility.class.getName())
                .log(Level.SEVERE, null, ex);
    }
    return con;
}

public ResultSet databaseQuerying(Connection con, String query){

    ResultSet resultSet = null;
    try {
        PreparedStatement preStmt = con.prepareStatement(query);
        resultSet = preStmt.executeQuery();
    } catch (SQLException ex) {
        Logger.getLogger(DataBaseUtility.class.getName()).log(Level.SEVERE, null, ex);
    }
    return resultSet;
}}

和

public class MainApp extends Application {

public static DataBaseUtility dbUtility ;
public static Connection con;

@Override
public void init(){
    dbUtility = new DataBaseUtility();
    con = dbUtility.derbyDBConnection("jdbc:derby:elsarhEmbedded");
    try {
        DatabaseMetaData dbmd = con.getMetaData();
        System.out.println("\n----------------------------------------------------") ;
        System.out.println("Database Name     = " + dbmd.getDatabaseProductName()) ;
        System.out.println("Database User Name= " + dbmd.getUserName()) ;
        System.out.println("Database Version  = " + dbmd.getDatabaseProductVersion()) ;
        System.out.println("Driver Name       = " + dbmd.getDriverName()) ;
        System.out.println("Driver Version    = " + dbmd.getDriverVersion()) ;
        System.out.println("Database URL      = " + dbmd.getURL()) ;
        System.out.println("----------------------------------------------------") ;

 /*
    -------------the result from the above ----------
    Database Name     = Apache Derby
    Database User Name= APP
    Database Version  = 10.14.1.0 - (1808820)
    Driver Name       = Apache Derby Embedded JDBC Driver
    Driver Version    = 10.14.1.0 - (1808820)
    Database URL      = jdbc:derby:elsarhEmbedded
    */

    } catch (SQLException ex) {
        Logger.getLogger(MainApp.class.getName()).log(Level.SEVERE, null, ex);
    }
}

我尝试从 netbeans 向数据库执行命令并将数据插入同一个 table 并且它有效。

Answer 1

正如@Mark Rotteveel 所说，这都是关于相对路径和目录的，@BlueRat 在 this question

的回答中对此进行了很好的解释

jdbc 在 javafx 应用程序中使用嵌入式 derby：Table/View 'TABLE NAME' 不存在异常

jdbc with embedded derby in javafx application: Table/View 'TABLE NAME' does not exist exception

java

jdbc

javafx-8

derby

embedded-database