Question

我正在使用内容提供商。 Content Provider使用SQLBuilder：

public Cursor query(Uri uri, String[] projection, String selection,
        String[] selectionArgs, String sortOrder) {

    SQLiteQueryBuilder sqlBuilder = new SQLiteQueryBuilder();
    sqlBuilder.setTables(TABLE_NAME);

    if(uriMatcher.match(uri) == ANIMAL_ID)
        sqlBuilder.appendWhere(ID + " = " + uri.getPathSegments().get(0));

    if(uriMatcher.match(uri) == ANIMAL_PID)
        sqlBuilder.appendWhere(PID + " = " + uri.getPathSegments().get(1));

    if(uriMatcher.match(uri) == ANIMAL_NAME)
        sqlBuilder.appendWhere(NAME + " = " + uri.getPathSegments().get(1));

    if(uriMatcher.match(uri) == ANIMAL_RID)
        sqlBuilder.appendWhere("rid = " + uri.getPathSegments().get(1));

    if(sortOrder == null || sortOrder == "")
        sortOrder = "naam";

    Cursor c = sqlBuilder.query(animalDB, projection, selection, selectionArgs, null, null, sortOrder);
    c.setNotificationUri(getContext().getContentResolver(), uri);

    return c;
}

这是我得到的完整错误：

05-30 12:36:43.564: WARN/Database(6746): Reached MAX size for compiled-sql statement cache for database /data/data/nl.actinum.labbook/databases/blue4green; i.e., NO space for this sql statement in cache: SELECT * FROM dier WHERE (rid = 84) ORDER BY naam. Please change your sql statements to use '?' for bindargs, instead of using actual values

我不清楚如何将问号与SQLBuilder结合起来，有人能举例说明吗？

Answer 1

if(uriMatcher.match(uri) == ANIMAL_RID) {
        sqlBuilder.appendWhere("rid = ?");
        selectionArgs = new String[] {uri.getPathSegments().get(1)};
    }

这很有效。没有更多缓存错误。

Content Provider MAX size compile-sql语句

1 个答案: