插入命令

Question

  

03-27 10：39：55.279 23303-23303 / com.example.danyalahmed.stockmanagement   E / SQLiteLog：（1）外键不匹配 - “产品”引用   “类别”03-27 10：39：55.280   23303-23303 / com.example.danyalahmed.stockmanagement E / SQLiteDatabase：   插入代码时出错= 2536 Price = 5 CategoryID = 1 Quantity = 2 Name =Olá                                                                                            android.database.sqlite.SQLiteException：外键不匹配 -   “Product”引用“Category”（代码1）:,同时编译：INSERT   INTO PRODUCT（代码，价格，类别ID，数量，名称）价值（？，？，？，？，？）                                                                                                在   android.database.sqlite.SQLiteConnection.nativePrepareStatement（母语   方法）                                                                                                在   android.database.sqlite.SQLiteConnection.acquirePreparedStatement（SQLiteConnection.java:895）                                                                                                在   android.database.sqlite.SQLiteConnection.prepare（SQLiteConnection.java:506）                                                                                                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.insertWithOnConflict（SQLiteDatabase.java:1469）                                                                                                在   android.database.sqlite.SQLiteDatabase.insert（SQLiteDatabase.java:1341）                                                                                                在   com.example.danyalahmed.stockmanagement.Classes.DbAdapter.insertData（DbAdapter.java:131）                                                                                                在   com.example.danyalahmed.stockmanagement.Activities.Scan_Page $ 3.onClick（Scan_Page.java:162）                                                                                                在android.view.View.performClick（View.java:4856）                                                                                                在android.view.View $ PerformClick.run（View.java:19956）                                                                                                在android.os.Handler.handleCallback（Handler.java:739）                                                                                                在android.os.Handler.dispatchMessage（Handler.java:95）                                                                                                在android.os.Looper.loop（Looper.java:211）                                                                                                在android.app.ActivityThread.main（ActivityThread.java:5373）                                                                                                at java.lang.reflect.Method.invoke（Native Method）                                                                                                在java.lang.reflect.Method.invoke（Method.java:372）                                                                                                在   com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:1020）                                                                                                在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:815）

如果你检查一下，

Error inserting Code=2536 Price=5 CategoryID=1 Quantity=2 Name=Olá

你可以看到我有CategoryID = 1。

当我创建数据库时，我将类别放在那里：

INSERT INTO Category VALUES(1, 'OTHERS');
INSERT INTO Category VALUES(2, 'Crisp');
INSERT INTO Category VALUES(3, 'Sweet');

这是产品结构：

CREATE TABLE IF NOT EXISTS Product (" +
      " _id INTEGER PRIMARY KEY  AUTOINCREMENT  NOT NULL  UNIQUE," +
      "Name VARCHAR NOT NULL," +
      "Code VARCHAR NOT NULL," +
      "Quantity INTEGER NOT NULL," +
      "PRICE DOUBLE NOT NULL," +
      "CategoryID INTEGER NOT NULL," +
      "FOREIGN KEY(CategoryID) REFERENCES Category(ID));

这是查询：

public boolean insertData(String Table, String[] Columns, String[] Values) {   
    db = this.getWritableDatabase();
    ContentValues contentValues = new ContentValues();
    for (int i = 1; i < Columns.length; i++) {
        contentValues.put(Columns[i].replace(Table + ".", ""), Values[i].trim());
    }
    return ((db.insert(Table, null, contentValues)) != -1);
}

感谢任何帮助。

感谢。

Answer 1

我的水晶球告诉我你没有看过documentation而忘记将ID表的Category列作为主键。