在我的C＃app中，我正在使用Dapper调用存储过程：
return conn.Query<MyList>("check_data", new { dataToCheck }, commandType: CommandType.StoredProcedure);
dataToCheck是DataTable，因为check_data接受TVP。此表类型有2列（from_date varchar（20），to_date varchar（20））并基于以下类。
public class DataToCheckType
{
public DateTime? from_date {get; set;}
public DateTime? to_date {get; set;}
}
Dapper将以下内容发送到SQL Server：
declare @p1 dbo.CheckDataType
insert into @p1 values('2017-04-19 00:00:00','2017-04-19 00:00:00')
exec check_data @dataToCheck=@p1
SP本身很简单。它调用一个构建SQL语句的函数，然后执行该函数：
DECLARE @sql nvarchar(max) = dbo.GetSql(@dataToCheck);
DECLARE @results TABLE (Id int);
INSERT INTO @results EXECUTE(@sql);
GetSql函数的开头如下：
DECLARE @fromDate datetime;
DECLARE @toDate datetime;
SELECT
@fromDate = CONVERT(datetime, from_date, 120),
@toDate = CONVERT(datetime, to_date, 120),
FROM
@dataToCheck;
它继续按预期构建SQL语句。从SP运行T-SQL时一切正常。
但是，当从代码运行相同时，我收到以下错误：
check_data：241从字符串
转换日期和/或时间时转换失败
为什么SP在T-SQL中工作，但在从代码调用时却没有？日期有什么问题？
答案 0 :(得分：0)
通过将表格类型中的列从NullPointerException更改为@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main_menu, menu);
MenuItem item = menu.findItem(R.id.action_search);
searchView = (SearchView) MenuItemCompat.getActionView(item);
searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
@Override
public boolean onQueryTextSubmit(String query) {
Toast.makeText(MainActivity.this, query, Toast.LENGTH_LONG).show();
Intent intent = new Intent(MainActivity.this, SearchActivity.class);
intent.putExtra("query", query);
startActivity(intent);
return true;
}
@Override
public boolean onQueryTextChange(String newText) {
Log.d("Text Changing", newText);
if (newText.length() > 3) {
searchView.setSuggestionsAdapter(provideSuggestionAdapter(newText));
}
return true;
}
});
return true;
}
void jsonParse(String jsonString) throws JSONException {
JSONObject jsonObject = new JSONObject(jsonString);
StringBuilder mAuthorBuilder = new StringBuilder();
if (jsonObject != null) {
JSONArray itemArray = jsonObject.getJSONArray("items");
for (int i = 0; i < itemArray.length(); i++) {
JSONObject itemObject = itemArray.getJSONObject(i);
JSONObject volumeInfo = itemObject.getJSONObject("volumeInfo");
if (volumeInfo.has("title")) {
mBookNames.add(volumeInfo.get("title").toString());
}
if (volumeInfo.has("authors")) {
JSONArray authorArray = volumeInfo.getJSONArray("authors");
if (volumeInfo.getJSONArray("authors") != null) {
mAuthorBuilder.delete(0,mAuthorBuilder.length());
for (int j = 0; j < authorArray.length(); j++) {
mAuthorBuilder.append(authorArray.getString(j) + "\n");
}
mAuthors.add(mAuthorBuilder.toString());
}
}
}
}
}
private SimpleCursorAdapter provideSuggestionAdapter(final String query) {
Log.d("start:","pass");
SimpleCursorAdapter a = new SimpleCursorAdapter(this, R.layout.cust_list_suggestions, null, from, to, 0);
a.setStringConversionColumn(1);
FilterQueryProvider filterQueryProvider = new FilterQueryProvider() {
@Override
public Cursor runQuery(CharSequence constraint) {
constraint = query.trim().replaceAll("\\s+", "+");
Log.d("Query: ", "runQuery constraint: " + constraint);
if (constraint == null) {
return null;
}
String[] columnNames = {BaseColumns._ID, "bName", "bAuthor"};
MatrixCursor c = new MatrixCursor(columnNames);
try {
String urlString = "https://www.googleapis.com/books/v1/volumes?q=" + constraint + "&key=" + getResources().getString(R.string.google_api_key);
URL url = new URL(urlString);
HttpURLConnection con = (HttpURLConnection) url.openConnection();
InputStream is = con.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder builder = new StringBuilder();
String line;
while((line = reader.readLine())!=null){
builder.append(line);
}
String jsonStr = builder.toString();
Log.d("jsonStr",jsonStr);
jsonParse(jsonStr);
for (int i=0;i<mAuthors.size();i++){
c.newRow().add(i).add(mBookNames.get(i)).add(mAuthors.get(i));
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (JSONException e) {
e.printStackTrace();
}
return c;
}
};
a.setFilterQueryProvider(filterQueryProvider);
Log.d("end:","pass");
return a;
}
来解决问题。