How to export database table data to Excel

1. First, there is a need for a npoi

2. The next code

1 Private voidButton1_Click (Objectsender, EventArgs e)2 {3 //1. Read data via ADO4 stringsql ="SELECT * from Asrs_f1";5 using(SqlDataReader reader =sqlhelper.executereader (SQL, CommandType.Text))6 {7 //If you read the data8 if(reader. HasRows)9 {TenIworkbook wk =NewHssfworkbook (); OneIsheet sheet = wk. Createsheet ("asrs_f1"); A  - #regionCreate first row, set column name - //-------------------------------------------------- the //Create first row, first row indicates column name -IRow Rowhead = sheet. CreateRow (0); - //each column of the loop query -  for(intCol =0; Col < reader. FieldCount; col++) + { - Rowhead.createcell (COL). Setcellvalue (reader. GetName (col)); + } A //-------------------------------------------------- at #endregion -  - intRindex =1; - //The following is the creation of data rows -  while(reader. Read ()) - { in //ID, Position, AName, Acode, Astate, Abatch, Adatetime, Bname, Bcode, Bstate, Bbatch, Bdatetime, ismoving , Istype -IRow CurrentRow =sheet. CreateRow (rindex); torindex++; + intId = reader. GetInt32 (0); - stringPosition = reader. GetString (1); the stringAName = reader. GetString (2); * stringAcode = reader. GetString (3); $ stringAstate = reader. GetString (4);Panax Notoginseng stringAbatch =reader. IsDBNull (5)?NULL: Reader. GetString (5); -Datetime? Lockdate = reader. IsDBNull (6) ?NULL: (DateTime?) Reader. GetDateTime (6); the stringbname = reader. GetString (7); + stringBcode = reader. GetString (8); A stringBstate = reader. GetString (9); the stringBbatch = reader. IsDBNull (Ten)?NULL: Reader. GetString (Ten); +Datetime? Lockdates = reader. IsDBNull ( One) ?NULL: (DateTime?) Reader. GetDateTime ( One); - stringismoving = reader. GetString ( A); $ stringIstype = reader. GetString ( -); $  -Currentrow.createcell (0). Setcellvalue (Id); -Currentrow.createcell (1). Setcellvalue (Position); theCurrentrow.createcell (2). Setcellvalue (AName); -Currentrow.createcell (3). Setcellvalue (Acode);WuyiCurrentrow.createcell (4). Setcellvalue (astate); theCurrentrow.createcell (5). Setcellvalue (Abatch); - if(Lockdate = =NULL) Wu { - //if it is a null value, then just like Excel writes a cell, the type of the cell is blank AboutCurrentrow.createcell (6). Setcelltype (Celltype.blank); $ } - Else - { -  A //Create a cell +Icell celllockdate = Currentrow.createcell (6); the  - //Create a cell style $Icellstyle CellStyle =wk. Createcellstyle (); theCellstyle.dataformat = Hssfdataformat.getbuiltinformat ("m/d/yy h:mm"); the //Set Current cell apply CellStyle style theCelllockdate.cellstyle =CellStyle; the  -  in Celllockdate.setcellvalue (DateTime) lockdate); the } theCurrentrow.createcell (7). Setcellvalue (bname); AboutCurrentrow.createcell (8). Setcellvalue (Bcode); theCurrentrow.createcell (9). Setcellvalue (bstate); theCurrentrow.createcell (Ten). Setcellvalue (Bbatch); the  + if(Lockdates = =NULL) - { the //if it is a null value, then just like Excel writes a cell, the type of the cell is blankBayiCurrentrow.createcell ( One). Setcelltype (Celltype.blank); the } the Else - { -  the //Create a cell theIcell celllockdate = Currentrow.createcell ( One); the  the //Create a cell style -Icellstyle CellStyle =wk. Createcellstyle (); theCellstyle.dataformat = Hssfdataformat.getbuiltinformat ("m/d/yy h:mm"); the //Set Current cell apply CellStyle style theCelllockdate.cellstyle =CellStyle;94  the  the Celllockdate.setcellvalue (DateTime) lockdates); the }98Currentrow.createcell ( A). Setcellvalue (ismoving); AboutCurrentrow.createcell ( -). Setcellvalue (istype); - }101 102 //Write103 using(FileStream fswrite = File.openwrite ("semi-Finished inventory table. xls"))104 { the wk. Write (fswrite);106 }107Label1. Text ="Write Success! "+ DateTime.Now.ToString ("YYYY-MM-DD HH:mm:ss");108 }109 Else the {111Label1. Text ="no data was queried"; the }113 } the  the}

How to export database table data to Excel