SQLite 在启动 Android 应用程序时触发错误

Question

我正在尝试创建一个在其数据库上使用触发器的应用程序。每当我尝试在 Android Studio 上运行它时，应用程序运行良好并且代码中没有错误。但是当我尝试在逍遥或棒棒糖手机上运行它时，它会显示一些错误消息。我已尝试修复它，但现在当我在修复后尝试启动它时出现此消息。

java.lang.RuntimeException: 无法启动活动 ComponentInfo{com.dexpensemanager/com.dexpensemanager.Home}: android.database.sqlite.SQLiteException: 触发器内的 INSERT、UPDATE 和 DELETE 语句中不允许有限定的表名（代码1）：，编译时：如果不存在则创建触发器sumcalc_income在TRANS.type =收入和strftime（'％Y'-'％m'，'现在'，'月开始'时为每一行插入后） ) BEGIN 插入 SUMTRANS.income SELECT SUM(income) FROM TRANS.amount END; 在 android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2460) 在 android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2522) 在 android.app.ActivityThread.access$800(ActivityThread.java:169) 在 android.app.ActivityThread$H.handleMessage(ActivityThread.java:1421) 在 android.os.Handler.dispatchMessage(Handler.java:111) 在 android.os.Looper.loop(Looper.java:194) 在 android.app.ActivityThread.main(ActivityThread.java:5546) 在 java.lang.reflect.Method.invoke（本机方法） 在 java.lang.reflect.Method.invoke(Method.java:372) 在 com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:967) 在 com.android.internal.os.ZygoteInit.main(ZygoteInit.java:762) 引起：android.database.sqlite.SQLiteException：在触发器（代码 1）中的 INSERT、UPDATE 和 DELETE 语句中不允许有限定的表名：，编译时：如果不存在则创建触发器 sumcalc_income AFTER INSERT ON TRANS FOR EACH WHEN TRANS.type=income AND strftime ('%Y'-'%m','now','start of month') BEGIN insert into SUMTRANS.income SELECT SUM(income) FROM TRANS.amount END; 在 android.database.sqlite.SQLiteConnection.nativePrepareStatement（本机方法） 在 android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:898) 在 android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:509) 在 android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588) 在 android.database.sqlite.SQLiteProgram.(SQLiteProgram.java:58) 在 android.database.sqlite.SQLiteStatement.(SQLiteStatement.java:31) 在 android.database.sqlite.SQLiteDatabase.executeSql(SQLiteDatabase.java:1704) 在 android.database.sqlite.SQLiteDatabase.execSQL(SQLiteDatabase.java:1635) 在 com.example.connectionDB.DBnTrigger.onCreate(DBnTrigger.java:45) 在 android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:251) 在 android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:163) 在 com.example.connectionDB.DBnTrigger.getLastIncome(DBnTrigger.java:459) 在 com.dexpensemanager.Home.onCreate(Home.java:61) 在 android.app.Activity.performCreate(Activity.java:5975) 在 android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1111) 在 android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2413) ... 10 更多

这是我从create trigger 参考中获取的触发器代码

public String insincTrigger() {
    String insinc = "CREATE TRIGGER if not exists sumcalc_income "
            + " AFTER INSERT "
            + " ON "+TRANSACTION_TABLE
            + " FOR  EACH  ROW "
            + " WHEN "
            + " TRANS.type= income "
            + " AND  strftime ('%Y'-'%m','now','start of month') "
            + " BEGIN "
            + " insert into SUMTRANS.income "
            + " SELECT SUM(income) FROM TRANS.amount "
            + " END; ";

    return insinc;
}

public String insexpTrigger(){
    String insexp = "CREATE TRIGGER if not exists sumcalc_expense "
            + " AFTER INSERT "
            + " ON "+TRANSACTION_TABLE
            + " FOR  EACH  ROW "
            + " WHEN "
            + " TRANS.type= expense "
            + " WHERE  strftime ('%Y'-'%m','now','start of month') "
            + " BEGIN "
            + " insert into SUMTRANS.expense "
            + " SELECT SUM(expense) FROM TRANS.amount "
            + " END; ";
    return insexp;
}

public String upincTrigger(){
    String upinc = "CREATE TRIGGER if not exists usumcalc_income "
            + " AFTER UPDATE "
            + " OF [amount] "
            + " ON "+TRANSACTION_TABLE
            + " FOR  EACH  ROW "
            + " WHEN "
            + " TRANS.type= income "
            + " WHERE  strftime ('%Y'-'%m','now','start of month') "
            + " BEGIN "
            + " UPDATE OR REPLACE "+TRANSACTION_SUM
            + " SET [income] = SELECT SUM(income) from TRANS.amount "
            + " END; ";
    return upinc;
}

public String upexpTrigger() {
    String upexp = "CREATE TRIGGER if not exists usumcalc_expense "
            + " AFTER UPDATE "
            + " OF [amount] "
            + " ON "+TRANSACTION_TABLE
            + " FOR  EACH  ROW "
            + " WHEN "
            + " TRANS.type= expense "
            + " WHERE  strftime ('%Y'-'%m','now','start of month') "
            + " BEGIN "
            + " UPDATE OR REPLACE "+TRANSACTION_SUM
            + " SET [expense] = SELECT SUM(expense) from TRANS.amount "
            + " END; ";
    return upexp;
}

public String delTrigger(){
    String del = "CREATE TRIGGER if not exists sumcalc_delete "
            + " AFTER DELETE "
            + " ON "+TRANSACTION_TABLE
            + " FOR  EACH  ROW "
            + " WHEN "
            + " TRANS.type = income AND expense "
            + " WHERE  strftime ('%Y'-'%m','now','start of month') "
            + " BEGIN "
            + " DELETE FROM "+TRANSACTION_SUM
            + " WHERE = SELECT SUM(income AND expense) from TRANS.amount "
            + " END; ";
    return del;
}

public String instimeTrigger(){
    String instime = "CREATE TRIGGER if not exists sumcalc_instime "
            + " AFTER INSERT "
            + " ON "+TRANSACTION_SUM
            + " FOR  EACH  ROW "
            + " BEGIN "
            + " insert into SUMTRANS.month "
            + " VALUES ('%Y'-'%m','now','start of month') "
            + " END;";
    return instime;
}

public String deltimeTrigger(){
    String deltime = "CREATE TRIGGER if not exists sumcalc_instime "
            + " AFTER DELETE "
            + " ON "+TRANSACTION_SUM
            + " FOR  EACH  ROW "
            + " BEGIN "
            + " DELETE FROM SUMTRANS.month "
            + " END; ";
    return deltime;
}

谁能告诉我该怎么办？

谢谢。

Answer 1

异常堆栈清楚地说明了问题：

android.database.sqlite.SQLiteException: qualified table names are not allowed on
INSERT, UPDATE, and DELETE statements within triggers (code 1)

来自您问题中的链接SQLite docs（强调我的）：

触发器中 UPDATE、DELETE 和 INSERT 语句的语法限制

触发器中的 UPDATE、DELETE 和 INSERT 语句不支持 UPDATE、DELETE 和 INSERT 语句的完整语法。以下限制适用：

• 在 UPDATE、DELETE 或 INSERT 中要修改的表的名称 语句必须是非限定表名。换句话说，必须 指定时只使用“tablename”而不是“database.tablename” 桌子。要修改的表必须存在于同一个数据库中 触发器附加到的表或视图。

• INSERT 语句的“INSERT INTO table DEFAULT VALUES”形式 不支持。

• UPDATE 不支持 INDEXED BY 和 NOT INDEXED 子句 和 DELETE 语句。

• UPDATE 和 DELETE 语句中的 ORDER BY 和 LIMIT 子句是 不支持。 ORDER BY 和 LIMIT 通常不支持 在任何上下文中更新或删除，但可以为顶级启用 使用 SQLITE_ENABLE_UPDATE_DELETE_LIMIT 编译时的语句 选项。但是，该编译时选项仅适用于顶级 UPDATE 和 DELETE 语句，而不是 UPDATE 和 DELETE 语句 触发器。

• 内部的语句不支持公用表表达式 触发器。

我想SUMTRANS 语句中的insert into SUMTRANS.expense 是数据库名称。根据文档，这是不支持的。

希望这会有所帮助。