Question

我创建了嵌入式Derby数据库，它给了我错误。尽管我有APP模式，其中表创建了REST

java.sql.SQLSyntaxErrorException: Table/View 'REST' does not exist.
at org.apache.derby.impl.jdbc.SQLExceptionFactory40.getSQLException(Unknown Source)
at org.apache.derby.impl.jdbc.Util.generateCsSQLException(Unknown Source)
at org.apache.derby.impl.jdbc.TransactionResourceImpl.wrapInSQLException(Unknown Source)
at org.apache.derby.impl.jdbc.TransactionResourceImpl.handleException(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedConnection.handleException(Unknown Source)
at org.apache.derby.impl.jdbc.ConnectionChild.handleException(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedStatement.execute(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedStatement.execute(Unknown Source)

这是java类：

public class Main
{   
    private static String dbURL = "jdbc:derby:tes;create=true";
    private static String tableName = "REST";
    // jdbc Connection
    private static Connection conn = null;
    private static Statement stmt = null;

    public static void main(String[] args)
    {
        createConnection();
       insertRestaurants(5, "LaVals", "Berkeley");
        selectRestaurants();
        shutdown();
    }

    private static void createConnection()
    {
        try
        {
         // System.setProperty("derby.system.home", "/Users/myuser/futbol");
          Class.forName("org.apache.derby.jdbc.EmbeddedDriver");
            //Get a connection
            conn = DriverManager.getConnection(dbURL);
        }
        catch (Exception except)
        {
            except.printStackTrace();
        }
    }
     private static void insertRestaurants(int id, String restName, String cityName)
    {
        try
        {
            stmt = conn.createStatement();
            stmt.execute("insert into REST values (" +
                    id + ",'" + restName + "','" + cityName +"')");
            stmt.close();
        }
        catch (SQLException sqlExcept) 
        {
            sqlExcept.printStackTrace();
        }
    }

}

Answer 1

我知道我落后了四年，但我终于找到了解决问题的方法（因此我在这个问题上的原因）。

我使用数据库脚本编辑器创建了我的表。我在桌子周围使用了双引号。当我进入服务选项卡（netbeans）时，我发现了这一点，并右键单击我的表来查看数据。我明白了：

select * from {schema}."{table}"

所以，我想我会把它翻译成我的java。而且，宾果。希望这会对你的应用程序有所了解，我复制并粘贴了你的一些代码，希望这会有效。

public class Db {
    private final String url = "jdbc:derby://localhost:1527/{db}";
    private final String tab = "{schema}.\"REST\"";

    private static Connection createConnection() throws Exception {
         Connection conn = null;
         conn = DriverManager.getConnection(url);
         return conn;
    }

    private static void insertRestaurants(int id, String restName, String cityName)
    {
        try
        {
            Connection conn = createConnection();
            stmt = conn.createStatement();
            stmt.execute("insert into " + table + " values (" +
                    id + ",'" + restName + "','" + cityName +"')");
            stmt.close();
        }
        catch (SQLException sqlExcept) 
        {
            sqlExcept.printStackTrace();
        }
    }
}

干杯！