自定义查询上的Android SQLite无法识别令牌

Question

我正在尝试查询我的SQLite数据库并隔离发送到游标的数据集。每条记录都有一个颜色字段，我想查询我的数据并返回特定的颜色。

当我运行它时，我得到一个SQLiteException：无法识别的令牌"红色"

以下是我目前所拥有的：

    public Cursor getGroupRecords( String color ) {
    Cursor mCursor = db.query(DATABASE_TABLE, DATABASE_STRUCTURE, 
            KEY_COLOR + "=" + color, null, null, null, null, null);
    if (mCursor != null) {
        mCursor.moveToFirst();
    }
    return mCursor;
}

这是我的日志：

08-23 13:52:00.560: D/szipinf(14301): Initializing inflate state
08-23 13:52:00.560: D/szipinf(14301): Initializing zlib to inflate
08-23 13:52:00.970: I/Database(14301): sqlite returned: error code = 1, msg = no such column: red
08-23 13:52:00.980: D/AndroidRuntime(14301): Shutting down VM
08-23 13:52:00.980: W/dalvikvm(14301): threadid=1: thread exiting with uncaught exception (group=0x2aac0560)
08-23 13:52:00.990: E/AndroidRuntime(14301): FATAL EXCEPTION: main
08-23 13:52:00.990: E/AndroidRuntime(14301): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.cca.pqr/com.cca.pqr.PQRActivity}: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.cca.pqr/com.cca.pqr.PQRListActivity}: android.database.sqlite.SQLiteException: no such column: red: , while compiling: SELECT _id, Color, Class, Subclass, Item, Value, Other, Remarks FROM PQR WHERE Color=red
08-23 13:52:00.990: E/AndroidRuntime(14301):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
08-23 13:52:00.990: E/AndroidRuntime(14301):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
08-23 13:52:00.990: E/AndroidRuntime(14301):    at android.app.ActivityThread.access$1500(ActivityThread.java:117)
08-23 13:52:00.990: E/AndroidRuntime(14301):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
08-23 13:52:00.990: E/AndroidRuntime(14301):    at android.os.Handler.dispatchMessage(Handler.java:99)
08-23 13:52:00.990: E/AndroidRuntime(14301):    at android.os.Looper.loop(Looper.java:123)
08-23 13:52:00.990: E/AndroidRuntime(14301):    at android.app.ActivityThread.main(ActivityThread.java:3683)
08-23 13:52:00.990: E/AndroidRuntime(14301):    at java.lang.reflect.Method.invokeNative(Native Method)
08-23 13:52:00.990: E/AndroidRuntime(14301):    at java.lang.reflect.Method.invoke(Method.java:507)
08-23 13:52:00.990: E/AndroidRuntime(14301):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
08-23 13:52:00.990: E/AndroidRuntime(14301):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
08-23 13:52:00.990: E/AndroidRuntime(14301):    at dalvik.system.NativeStart.main(Native Method)
08-23 13:52:00.990: E/AndroidRuntime(14301): Caused by: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.cca.pqr/com.cca.pqr.PQRListActivity}: android.database.sqlite.SQLiteException: no such column: red: , while compiling: SELECT _id, Color, Class, Subclass, Item, Value, Other, Remarks FROM PQR WHERE Color=red

如有任何建议或帮助，我们将不胜感激。提前感谢！

更新这是工作代码：

    public Cursor getGroupRecords( String color ) {
    final String SELECTION = KEY_COLOR + "=?";
    final String[] SELECTION_ARGS = { color };
    Cursor mCursor = db.query(DATABASE_TABLE, DATABASE_STRUCTURE, 
            SELECTION, SELECTION_ARGS, null, null, null, null);
    if (mCursor != null) {
        mCursor.moveToFirst();
    }
    return mCursor;
}

Answer 1

是的。构建查询的方式有问题。看看这个例子。

public static Cursor getItemWithColor(ContentResolver contentResolver, String color) {
    Uri uri = My.Table.CONTENT_URI;
    final String[] PROJECTION = {
            My.Table._ID, My.Table.COLOR
    };
    final String SELECTION = My.Table.COLOR + "=?";
    final String[] SELECTION_ARGS = {
            color
    };
    Cursor cursor = contentResolver.query(uri, PROJECTION, SELECTION, SELECTION_ARGS, null);
    return cursor;
}

Answer 2

我刚刚遇到了这个问题，发现它可以通过在引号中包含选择参数来解决。仅仅使用标准的选择参数字段似乎对同时包含数字和字母的值无效。

因此产生的查询将是：

db.query(DATABASE_TABLE, DATABASE_STRUCTURE, 
        KEY_COLOR + "="" + color+""", null, null, null, null, null);