Question

我在Win 7平台上使用Eclipse Helios。我有这个Dao课

package com.example.hello;

import com.j256.ormlite.field.DatabaseField;
import com.j256.ormlite.table.DatabaseTable;

@DatabaseTable(tableName = "accounts")
public class Account {

        // for QueryBuilder to be able to find the fields
        public static final String NAME_FIELD_NAME = "name";
        public static final String PASSWORD_FIELD_NAME = "passwd";

        @DatabaseField(generatedId = true)
        private int id;

        @DatabaseField(columnName = NAME_FIELD_NAME, canBeNull = false)
        private String name;

        @DatabaseField(columnName = PASSWORD_FIELD_NAME)
        private String password;

        Account() {
                // all persisted classes must define a no-arg constructor with at least package visibility
        }

        public Account(String name) {
                this.name = name;
        }

        public Account(String name, String password) {
                this.name = name;
                this.password = password;
        }

        public int getId() {
                return id;
        }

        public String getName() {
                return name;
        }

        public void setName(String name) {
                this.name = name;
        }

        public String getPassword() {
                return password;
        }

        public void setPassword(String password) {
                this.password = password;
        }

        @Override
        public int hashCode() {
                return name.hashCode();
        }

        @Override
        public boolean equals(Object other) {
                if (other == null || other.getClass() != getClass()) {
                        return false;
                }
                return name.equals(((Account) other).name);
        }
}

我的DatabaseConfigUtil如下，

package com.example.hello;

import java.io.IOException;
import java.sql.SQLException;

import com.j256.ormlite.android.apptools.OrmLiteConfigUtil;

/**
 * Database helper class used to manage the creation and upgrading of your database. This class also usually provides
 * the DAOs used by the other classes.
 */
public class DatabaseConfigUtil extends OrmLiteConfigUtil {

    public static void main(String[] args) throws SQLException, IOException {
        writeConfigFile("ormlite_config.txt");
    }
}

我的问题是，如果我尝试生成原始数据库配置文件，它在res / raw文件夹中成功生成，但文件中没有添加任何内容，除了

#
# generated on 2013/06/26 05:18:40
#

为什么我的数据库字段不是在这里自动生成的？

Answer 1

根据writeConfigFile(String fileName)的文档：

在当前目录或下面查找带注释的类将配置文件写入原始文件夹中的文件名。

假设您的类和DatabaseConfigUtil位于同一个目录/包中，它应该可以工作。如你所述，它没有。

我不知道为什么你的res/raw/ormlite_config.txt是空的，但我建议修复另一个解决方案。我是这样做的（版本4.45）：

public class DatabaseConfigUtil extends OrmLiteConfigUtil {

    // The logger. We cannot use Android's Log class since this is a standalone command line app.
    private static final Logger logger = Logger.getLogger(DatabaseConfigUtil.class.getName());

    /**
     * The name of the generated ORMLite config file.
     */
    public static final String CONFIG_FILE_NAME = "ormlite_config.txt";

    /**
     * An array of Class-es which will be stored in the local DB.
     */
    public static final Class<?>[] CLASSES = new Class[]{
            Alarm.class,
            Helper.class
    };

    /**
     * A main method that needs to be executed when a new model class is
     * introduced to the code base.
     *
     * @param args command line parameters (which are ignored).
     *
     * @throws IOException  when the config file cannot be written to `res/raw/`.
     * @throws SQLException when one of the Class-es in `CLASSES` contains invalid
     *                      SQL annotations.
     */
    public static void main(String[] args) throws IOException, SQLException {

        File rawFolder = new File("res/raw");

        // Check is `res/raw` exists ...
        if(!rawFolder.exists()) {

            // ... if not create it.
            boolean rawCreated = rawFolder.mkdirs();

            if(!rawCreated) {
                logger.warning("could not create a 'raw' folder inside 'res/'" +
                        " from DatabaseConfigUtil: no DB-config file created!");
                System.exit(1);
            }
            else {
                logger.info("created folder `res/raw/`");
            }
        }

        writeConfigFile(CONFIG_FILE_NAME, CLASSES);
    }
}

生成原始空文件和数据库字段的Ormlite DatabaseConfigUtil.java未添加

1 个答案: