此处已经提出了类似的问题：constraint check against values of foreign key，此处Having data from another table put in into check constraint，但这并不是我的意思（或者除了函数之外还有其他方式）。
我的问题是。不是引用复合FOREIGN KEY，然后通过CHECK约束检查引用列的值，我可以在Table A中引用来自Table B的代理PK并检查值Table A中Table A中的列的唯一标识，来自[test_table_a_id]的代理PK，例如CHECK CONSTRAINT
换句话说。我是否可以在Table B中Table A显式引用特定列，而是引用行的ID并在-- ===============================
-- ---------- TABLE A ------------
CREATE TABLE [r_Test_Table_A](
[test_table_a_id] [int] IDENTITY(1,1)
CONSTRAINT [PK_r_test_table_a] PRIMARY KEY CLUSTERED ([test_table_a_id] ASC)
, [a_attribute_1] [nvarchar] (50) NOT NULL
, [a_attribute_2] [nvarchar] (50) NOT NULL
, CONSTRAINT [ak_r_Test_Table_A_a_attribute1_a_attribute_2]
UNIQUE ([a_attribute_1], [a_attribute_2])
)
-- ===============================
-- ---------- TABLE B ------------
CREATE TABLE [r_Test_Table_B](
[test_table_b_id] [int] IDENTITY(1,1)
CONSTRAINT [PK_r_test_table_b] PRIMARY KEY CLUSTERED ([test_table_b_id] ASC)
, [b_attribute_1] [nvarchar] (50) NOT NULL
, [a_attribute_1] [nvarchar] (50) NOT NULL
CONSTRAINT [ch_Test_Table_A_a_attribute_1] CHECK ([a_attribute_1] = 'Cookie')
, [a_attribute_2] [nvarchar] (50) NOT NULL
, CONSTRAINT [fk_comp_r_Test_Table_B_r_Test_Table_A]
FOREIGN KEY ([a_attribute_1], [a_attribute_2])
REFERENCES [r_Test_Table_A]([a_attribute_1], [a_attribute_2])
)
中查找值。 （希望我对问题描述不太感兴趣）
public class Recipe extends ActionBarActivity {
TextView tex;
Button but;
String URL ="http://10.0.2.2/my_prog/www/mango/android/publico.php";
HttpClient Client = new DefaultHttpClient();
InputStream is =null;
int response;
@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.recipe);
but=(Button) findViewById(R.id.button1);
tex=(TextView) findViewById(R.id.textView1);
but.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View arg0) {
int len = 500;
try{
String Url = "http://10.0.2.2/my_prog/www/mango/android/publico.php";
URL url = new URL(Url);
HttpURLConnection conn =(HttpURLConnection) url.openConnection();
conn.setReadTimeout(10000);
conn.setConnectTimeout(15000);
conn.setDoInput(true);
conn.connect();
response = conn.getResponseCode();
is = conn.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(is));
StringBuffer sb =new StringBuffer();
String line="";
while ((line =br.readLine()) != null){
sb.append(line);
}
String data = sb.toString();
tex.setText(data);
}
catch(Exception ex){
tex.setText("problema di connetion" + response);
}
}
private String readIt(InputStream is, int len) {
Reader reader= null;
try{
reader =new InputStreamReader(is, "UTF-8");
char[] buffer =new char[len];
reader.read(buffer);
return new String(buffer);
}
catch(Exception ex){
return new String("problem on convert");
}
}
});
}
}