我创建了一个名为表的资源的，但是当我在其中插入值，这将引发异常：

I created a table named resources but when I insert values in it, this exception is thrown:

android.database.sqlite.SQLiteConstraintException:
error code 19: constraint failedexception

下面是我的创建表的语句：

public static final String DATABASE_CREATE = 
    "CREATE TABLE " + table_resources + "(ID INTEGER PRIMARY KEY, 
    KEY_TYPE text, KEY_ENCODING text, KEY_WIDTH text, KEY_HEIGHT text, 
    KEY_DATA text, KeyIId text)";

下面是我的插入的code：

JSONObject show = data.getJSONObject(i);
if (show.get("type").equals("resource_updates")) {
    JSONArray resources = show.getJSONArray("resources");
    try {
        System.out.println("length of resources is is " + resources.length());
        for (int resourceIndex = 0; resourceIndex < resources.length(); resourceIndex++) {
            type = resources.getJSONObject(resourceIndex).getString("type").toString();
            encoding = resources.getJSONObject(resourceIndex).getString("encoding").toString();
            data1 = resources.getJSONObject(resourceIndex).getString("data").toString();
            id = resources.getJSONObject(resourceIndex).getString("id").toString();
            try {
                width = resources.getJSONObject(resourceIndex).getString("width").toString();
            } catch (Exception e) {
                System.out.println(e);
                width = "null";
            }
            try {
                height = resources.getJSONObject(resourceIndex).getString("height").toString();
            } catch (Exception e) {
                e.printStackTrace();
                height = "null";
            }
            db.insert(type,encoding,width,height, data1,iid);
        }
    } catch (Exception e) {
        e.printStackTrace();
        System.out.println(e + "exception");
        System.out.println("exception in  the resources");
    }
}

谁能告诉我在哪里，可能是问题？

Can anyone tell me where could be the problem?

推荐答案

约束失败通常表明你不喜欢的东西传递空值到该声明为列不为空当你创建你的表。

Constraint failed usually indicates that you did something like pass a null value into a column that you declare as not null when you create your table.