memo

问题 Is there any way to set new generic in React.memo? For example, for class components, I can use // set generic class GenericClass<G extends string | number> extends PureComponent {} // and use like this <GenericClass<number> /> In the below scenario, I want to make type G generic. type G = string; const MemoComponent = memo<{ value: G; onValueChange: (newValue: G) => void }>( ({ value, onValueChange }) => { return ( <select onClick={() => { // do calculation onValueChange(value); }} > Button

问题 I've got an msaccess database which have been created in Access 2002. I only have access 2003 and 2008 in my computer. so I've converted the database into access 2003 format. The problem I have is that I have a table named tblItms_F001 in the database with a column named stemtext which is in memo datatype. I just want to be able to read the text inside that column in every row. (have around 150 rows only). Moreover I don't know VB and haven't used access before as database. I've used C#, Java

问题 Suppose I have these React components: const Compo1 = ({theName}) => { return ( <Nested foo={() => console.log('Dr. ' + theName)}/> ); }; const Compo2 = ({theName}) => { function theFoo() { console.log('Dr. ' + theName); } return ( <Nested foo={theFoo}/> ); }; And the nested component, wrapped in memo: const Nested = React.memo(({foo}) => { return ( <Button onClick={foo}>Click me</Button> ); }); Function passed in foo is always recreated in Compo1 and also Compo2 , correct? If so, since foo

问题 I want to insert a data frame from R into an existing table in my Oracle database using this code: sqlSave(connection, df, tablename = "oracle_table", append = TRUE) I get the error could not allocate memory . I tried inserting only one line, but the error still showed up. The type of some fields in the Oracle target table are memo . How can I insert my df in the oracle table? Structure of R data frame: $a: num $b: chr Structure of target table in Oracle database: a: number(10,0) b: CLOB

问题 I want to insert a data frame from R into an existing table in my Oracle database using this code: sqlSave(connection, df, tablename = "oracle_table", append = TRUE) I get the error could not allocate memory . I tried inserting only one line, but the error still showed up. The type of some fields in the Oracle target table are memo . How can I insert my df in the oracle table? Structure of R data frame: $a: num $b: chr Structure of target table in Oracle database: a: number(10,0) b: CLOB

问题 I have an Access 2003 database. A table has a Memo field and I'm having issues with getting that data out. Exporting that field to a txt or csv chops that field off (255 characters) Exporting as Excel gives me strange characters for linebreaks Appending to a mysql database via myODBC gives an error about "incorrect string" Using VBA with Scripting.FileSystemObject doesn't work unless you tell it to create the file as Unicode, which is okay, but then I can't get the file converted to something

问题 perl 5.8.9 Hello folks, I am successful in using DBI/DBD/ODBC to create a new table in an existing Access 2003 (.mdb) database with the following string: $q = "CREATE TABLE memoTestA (name TEXT, addr TEXT)"; # works but I can't figure out how to add a field of type MEMO ie $q = "CREATE TABLE memoTestB (name TEXT, addr TEXT, desc MEMO)"; # throws syntax error There must be a way - what is the trick? switching form using DBD::ODBC to Win32::OLE gets me past the "bad syntax" error thrown by the

问题 I need to be able to select the whole word of a TMemo if the caret is directly adjacent or in a word in the memo. Consider the following (where | is a caret) Here is some text| = Select text Here is so|me text = Select some |Here is some text = Select Here Here is some text | = Select '' 回答1: Check this code with comments to explain how works. function SelectWordUnderCaret(AMemo:TMemo):string; var Line : Integer; Column : Integer; LineText: string; InitPos : Integer; EndPos : Integer; begin /

问题 What datatype in MySQL would be best to use for data that was in Memo on Microsoft Access? 回答1: TEXT would be a good match. Text is a blob field that is meant to store strings. blob is the same for binary data. See: http://dev.mysql.com/doc/refman/5.0/en/blob.html Make sure you use a text/blob variant that is large enough to hold the data that is currently in your memo field. When in doubt longtext will hold up to 4GB. 回答2: I believe that would be the TEXT type in MySQL you are looking for.

问题 Why does Memo.Lines use the abstract class TStrings ? Why doesn't it use TStringList instead? And should I convert it to TStringList before working with it? 回答1: TMemo.Lines , TListBox.Items , TComboBox.Items , etc. ; all are declared as TStrings . Beware, talking about the property that is! The internal created types are TMemoStrings , TListBoxStrings and TComboBoxStrings respectively, which are all descendants of TStrings and differ all in way of storage. And why? For interchangeability and