Question

我希望有一个查询可以从数据库中选择所有私有= 0的信息，除非用户=＆＃39;用户名＆＃39;

像这样：

  // Volley request


StringRequest stringRequest = new StringRequest(Request.Method.POST, URLUtils.URL,
                new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response) {


                        try {
                            JSONObject jObj = new JSONObject(response);
                            if((jObj.getString("Ack").equals("1"))){
                                Toast.makeText(getApplicationContext(), jObj.getString("msg"), Toast.LENGTH_SHORT).show();
                                System.out.println(jObj.getString("image"));
                            }


                        } catch (JSONException e) {
                            // JSON error
                            e.printStackTrace();
                            Toast.makeText(getApplicationContext(), "Json error: " + e.getMessage(), Toast.LENGTH_LONG).show();
                        }
                    }
                }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                Toast.makeText(getApplicationContext(), "VolleyError" + error.toString(), Toast.LENGTH_LONG).show();
            }
        }) {
            @Override
            protected Map<String, String> getParams() {



                Map<String, String> params = new HashMap<String, String>();
                params.put("auth", "abc167");
                params.put("action", "editprofile");
                params.put("first_name", fname_et.getText().toString());
                params.put("last_name", lname_et.getText().toString());
                params.put("address", address_str);
                params.put("zipcode", zip_et.getText().toString());
                params.put("phoneno", phone_et.getText().toString());
                params.put("device_token_id", "1234567890");
                params.put("device_type", "android");
                params.put("lat", lat_str);
                params.put("long", lng_str);
                params.put("photo", imagepath);
                params.put("userid", "121");


                return params;
            }

        };

        RequestQueue requestQueue = Volley.newRequestQueue(getApplicationContext());
        requestQueue.add(stringRequest);

Answer 1

这是逻辑：

SELECT *
FROM table
WHERE private = 0 AND user != 'username';

此版本假定user不是NULL。

您可能会发现它更容易解释为：

SELECT *
FROM table
WHERE private = 0 AND NOT (user = 'username');

Answer 2

SELECT * FROM table WHERE private = 0 AND user != 'username'

Answer 3

回答原始问题：

SELECT * FROM table 
WHERE private = 0 
and user <> 'username'

编辑：OP添加了以下评论：

如果我想选择private = 0，除非private = 1且user =＆＃39; username＆＃39;

然后听起来你只是想要这个（但它不是100％清楚）：

SELECT * FROM table 
WHERE private = 0 
OR (private = 1 and user = 'username')

Answer 4

SELECT * FROM table_name 
WHERE private = 0 AND user != 'username'

SQL查询：SELECT * FROM表WHERE private = 0＆＃34;除非＆＃34; user =＆＃39;用户名＆＃39;

4 个答案: