如何在 ORMLite 中构建一个 Select 查询（没有连接的更多表）答案

【问题标题】：How to build a Select query (more tables without join) in ORMLite如何在 ORMLite 中构建一个 Select 查询（没有连接的更多表）
【发布时间】：2014-03-22 13:35:36
【问题描述】：

在 ORMLite 中查询这个的最好方法是什么？

SELECT JOB.TASK_JOB,
            JOB.NAME_JOB,
            JOB_SETTINGS.DAY1,
            JOB_SETTINGS.DAY2,
            JOB_SETTINGS.DAY3,
            JOB_SETTINGS.DAY4,
            JOB_SETTINGS.DAY5,
            JOB_SETTINGS.DAY6,
            JOB_SETTINGS.DAY7,
            JOB_SETTINGS.HOURSPERWEEK,
            JOB_SETTINGS.PAYPERHOUR,
            JOB_SETTINGS.VARIABLEHOURS,
            WORKINGDAY.DATE_WD,
            WORKINGDAY.H_BREAK,
            WORKINGDAY.H_REAL,
            WORKINGDAY.H_IN,
            WORKINGDAY.H_OUT
        FROM JOB, JOB_SETTINGS,WORKINGDAY
        WHERE JOB.ID_JOB = JOB_SETTINGS.ID_JOB
        AND JOB_SETTINGS.ID_JOB = WORKINGDAY.ID_JOB
        AND JOB.ID_JOB = 2

我对每个表都有一个类（标准 ORMLite），但我不明白如何构建这个查询...

谢谢！！！

编辑：

我写了这段代码，但实际上我无法继续，因为我对 OrmLite 语法感到困惑......

DbHelperJob queryDao = new DbHelperJob(getActivity());

    QueryBuilder<Job, String> qJob = queryDao.getJobDao().queryBuilder();
    qJob.selectColumns("NAME_JOB", "TASK_JOB");

    QueryBuilder<JobSettings, String> qJobSett = queryDao.getJobSettDao().queryBuilder();
    qJobSett.selectColumns("DAY1", "DAY2", "DAY3", "DAY4", "DAY5", "DAY6", "DAY7", "HOURSPERWEEK", "PAYPERHOUR", "VARIABLEHOURS");

    QueryBuilder<WorkingDay, String> qWD = queryDao.getWDDao().queryBuilder();
    qWD.selectColumns("DATE_WD", "H_BREAK", "H_REAL", "H_IN", "H_OUT");

【问题讨论】：

标签： android sql select join ormlite

【解决方案1】：

您可以使用 Dao 的 queryRaw() 方法。例如

GenericRawResults<String[]> rawResults = queryDao.queryRaw("SELECT JOB.TASK_JOB,
                JOB.NAME_JOB,
                JOB_SETTINGS.DAY1,
                JOB_SETTINGS.DAY2,
                JOB_SETTINGS.DAY3,
                JOB_SETTINGS.DAY4,
                JOB_SETTINGS.DAY5,
                JOB_SETTINGS.DAY6,
                JOB_SETTINGS.DAY7,
                JOB_SETTINGS.HOURSPERWEEK,
                JOB_SETTINGS.PAYPERHOUR,
                JOB_SETTINGS.VARIABLEHOURS,
                WORKINGDAY.DATE_WD,
                WORKINGDAY.H_BREAK,
                WORKINGDAY.H_REAL,
                WORKINGDAY.H_IN,
                WORKINGDAY.H_OUT
            FROM JOB, JOB_SETTINGS,WORKINGDAY
            WHERE JOB.ID_JOB = JOB_SETTINGS.ID_JOB
            AND JOB_SETTINGS.ID_JOB = WORKINGDAY.ID_JOB
            AND JOB.ID_JOB = 2")

在此处阅读更多信息enter link description here

【讨论】：

有效！！！非常感谢你！！我会添加 +1 来回答，但我没有最低的声誉分数！谢谢！

【解决方案2】：

这与 ORMLite 无关，但在 SQLiteQueryBuilder 中有一个非常方便的查询工具。你可以这样做：

private static final String COLS = new String[] {
    JOB.TASK_JOB,
    JOB.NAME_JOB,
    JOB_SETTINGS.DAY1,
    JOB_SETTINGS.DAY2,
    JOB_SETTINGS.DAY3,
    JOB_SETTINGS.DAY4,
    JOB_SETTINGS.DAY5,
    JOB_SETTINGS.DAY6,
    JOB_SETTINGS.DAY7,
    JOB_SETTINGS.HOURSPERWEEK,
    JOB_SETTINGS.PAYPERHOUR,
    JOB_SETTINGS.VARIABLEHOURS,
    WORKINGDAY.DATE_WD,
    WORKINGDAY.H_BREAK,
    WORKINGDAY.H_REAL,
    WORKINGDAY.H_IN,
    WORKINGDAY.H_OUT
}

private static String SEL =
    "JOB.ID_JOB = JOB_SETTINGS.ID_JOB"
        + "AND JOB_SETTINGS.ID_JOB = WORKINGDAY.ID_JOB"
        + "AND JOB.ID_JOB = 2"

private static String TABLES = "JOB, JOB_SETTINGS, WORKINGDAY""


// in the query method...
    db.execSQL(
        SQLiteQueryBuilder.buildQueryString(
            false, TABLES, COLS, SEL, null, null, null, null);

【讨论】：

感谢您的回复！但我会用 OrmLite 构建这个查询......实际上，我正在用这个库编写一个 Android 应用程序！ :) 有什么解决方案吗？
是的....我非常反对 ORM，尤其是在 Android 中。如果你真的必须做 ORM，我想你会在这里找到你需要的答案：ormlite.com/javadoc/ormlite-core/doc-files/…。你正在做一个 3-way join，这可能需要一些调整......这是我试图避免 ORM 的原因之一......祝你好运

【解决方案3】：

Android 查询有参数：

columns - 我们想要获取的字段列表
selection - 字符串 WHERE 条件
selectionArgs - 参数数组
选择。在选择时，可以使用“？”并将被这些值替换。
groupBy - 分组
有 - 使用聚合函数的条件
orderBy - 排序

使用它。

【讨论】：

是的，但是在 OrmLite 中有不同的语法，我对此感到非常困惑......谢谢！