Develop Reference

Dynamically insert into SQLite from text file

I am trying to create dynamical insert statements from text file, with only SQLite.
What I have done so far, is to create the SQL query with necessary parameters, add those parameters during run time, and try to select.
However I get error inside try block, when try to cmd.ExecuteNonQuery();
Caught exception: SQL logic error or missing database
near "#0": syntax error
using System;
using System.Data.SQLite;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
using System.Data.SqlClient;
namespace TestApp
class Program
{
static void Main(string[] args)
{
//To store the index and column name in the file
Dictionary<int, string> Columns = new Dictionary<int, string>();
char[] delimiterChars = { '\t' };
string createQuery = #" create table if not exists products(id integer not null primary key, name text);
insert into products (name) values ('A');
insert into products (name) values ('B');
insert into products (name) values ('C');
insert into products (name) values ('D');
insert into products (name) values ('E');
insert into products (name) values ('F');
insert into products (name) values ('G');
create table if not exists orders(id integer, dt datetime, product_id integer, amount real);";
System.Data.SQLite.SQLiteConnection.CreateFile("myDB.db3");
using (System.Data.SQLite.SQLiteConnection conn = new System.Data.SQLite.SQLiteConnection("data source=myDB.db3")){
using (System.Data.SQLite.SQLiteCommand cmd = new System.Data.SQLite.SQLiteCommand(conn)){
conn.Open();
cmd.CommandText = createQuery;
cmd.ExecuteNonQuery();
string[] lines = System.IO.File.ReadAllLines(Directory.GetCurrentDirectory() + #"../../../App_Data/import.txt");
cmd.CommandText = "INSERT INTO orders (";
// Identify the column order from first row of the import file
string[] elements = lines[0].Split(delimiterChars);
for (int i = 0; i < elements.Length; i++)
{
Columns[i] = elements[i];
cmd.CommandText = cmd.CommandText + "#COLUMN" + i + ", ";
cmd.Parameters.AddWithValue("#COLUMN" + i, Columns[i]);
System.Console.WriteLine(i + " : " + Columns[i]);
}
cmd.CommandText = cmd.CommandText.Remove(cmd.CommandText.Length - 2);
cmd.CommandText = cmd.CommandText + ") VALUES (";
string temp = cmd.CommandText;
System.Console.WriteLine(cmd.CommandText);
System.Console.WriteLine("Contents of Import File.txt = ");
for (int i = 1; i < lines.Length; i++)
{
cmd.CommandText = temp;
elements = lines[i].Split(delimiterChars);
for (int j = 0; j < elements.Length; j++)
{
cmd.CommandText = cmd.CommandText + "#VALUE" + j + ", ";
cmd.Parameters.AddWithValue("#VALUE" + j, elements[j]);
}
cmd.CommandText = cmd.CommandText.Remove(cmd.CommandText.Length - 2);
cmd.CommandText = cmd.CommandText + ")";
try
{
cmd.ExecuteNonQuery();
}
catch (Exception ex)
{
Console.WriteLine("Caught exception: " + ex.Message);
}
Console.WriteLine(cmd.CommandText);
Console.WriteLine(lines[i]);
}
cmd.CommandText = "Select * from orders";
cmd.ExecuteNonQuery();
using (System.Data.SQLite.SQLiteDataReader reader = cmd.ExecuteReader()){
while (reader.Read())
{
Console.WriteLine(reader["ID"] + " | " + reader["dt"] + " | " + reader["product_id"] + " | " + reader["amount"]);
}
conn.Close();
}
}
}
Console.WriteLine("Press any key to exit.");
Console.ReadLine();
}
}
}
I am not sure on what am I doing wrong?
The import.txt file consists of
id dt amount product_id
1 2017-02-01T10:01:12 343.33 1
2 2017-02-01T10:02:12 12 2
3 2017-03-01T10:03:12 344.3 1
4 2017-04-01T10:04:12 12 3
5 2017-05-01T10:05:12 66.5 1
6 2017-06-01T10:06:12 4
All items divided by TAB

The loop over the column names is useless because you already know the column names from the CREATE TABLE ORDERS command executed at the first lines.
By the way, you cannot use parameters to express the name of a column.
This is not allowed in any kind of database system that I know of.
You can safely remove it but note that you have declared the column order wrongly. In the CREATE TABLE you have
create table if not exists orders(
id integer, dt datetime, product_id integer, amount real
while in the file the product_id is the last column. So you need to adapt your CREATE TABLE to your file
create table if not exists orders(
id integer, dt datetime, amount real, product_id integer;
Next your insertion loop code could be rewritten in this way (ignoring the variable number of arguments as you explain)
string baseQuery = "INSERT INTO orders (id, dt, amount, product_id ) VALUES(";
string[] lines = System.IO.File.ReadAllLines(#"e:\temp\orders.txt");
// Skip the first line
for (int i = 1; i < lines.Length; i++)
{
string[] elements = lines[i].Split(delimiterChars);
// Keep the parameter names in a list to get an easy way to
// concatenate them all together at the end of the loop
List<string> text = new List<string>();
for (int j = 0; j < elements.Length; j++)
{
text.Add("#VALUE" + j);
cmd.Parameters.AddWithValue("#VALUE" + j, elements[j]);
}
// Create the command text in a single shot
cmd.CommandText = baseQuery + string.Join(",", text) + ")";
try
{
cmd.ExecuteNonQuery();
}
catch (Exception ex)
{
Console.WriteLine("Caught exception: " + ex.Message);
}
}
Consider also to enclose your database code inside a transaction like this as suggested by the link posted below by Alexander Petrov
using (System.Data.SQLite.SQLiteConnection conn = new System.Data.SQLite.SQLiteConnection("data source=myDB.db3"))
using (System.Data.SQLite.SQLiteCommand cmd = new System.Data.SQLite.SQLiteCommand(conn))
{
conn.Open();
using(SQLiteTransaction tr = conn.BeginTransaction())
{
cmd.Transaction = tr;
.....
for(....)
{
.....
}
tr.Commit();
}
}

Copying tables among databases

Let's say I want to copy all tables with their complete data from one database to another without specifically knowing detailed information about them(column count, data types...). The user would input a connection string to his database, and all data from it would be copied to an internal DB.
I tried to achieve it by using SqlConnection and writing direct T-SQL queries and managed to write a script that creates empty tables in Internal database with correct columns:
string createDestinationTableQuery = "create table " + schemaName + ".[" + tableName + "](";
DataTable ColumnsDT = new DataTable();
string getTableColumnDataQuery = "SELECT * FROM "+originalDBName+".INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME = N'" + tableName +"'";
SqlCommand getTableColumnDataCommand = new SqlCommand(getTableColumnDataQuery, originalCon);
SqlDataAdapter TableDA = new SqlDataAdapter(getTableColumnDataCommand);
TableDA.Fill(ColumnsDT);
for (int x = 0; x < ColumnsDT.Rows.Count; x++)
{
createDestinationTableQuery += "[" + ColumnsDT.Rows[x].ItemArray[3].ToString() + "] " + "[" + ColumnsDT.Rows[x].ItemArray[7].ToString() + "], ";
}
createDestinationTableQuery = createDestinationTableQuery.Remove(createDestinationTableQuery.Length - 2);
createDestinationTableQuery += " )";
SqlCommand createDestinationTableCommand = new SqlCommand(createDestinationTableQuery, destinationCon);
createDestinationTableCommand.ExecuteNonQuery();
Console.WriteLine("Table " + schemaName + "." + tableName + " created succesfully!");
However, I am struggling with data insertion as the following code simply doesn't work:
DataTable dataTable = new DataTable();
string getTableDataquery = "select * from " + originalTableWithSchema;
SqlCommand getTableDataCommand = new SqlCommand(getTableDataquery, originalCon);
SqlDataAdapter da = new SqlDataAdapter(getTableDataCommand);
da.Fill(dataTable);
for (int x = 0; x < dataTable.Rows.Count; x++)
{
string insertQuery = "insert into " + schemaName + ".["+tableName+"](" ;
string values = "VALUES(";
for (int y = 0; y < dataTable.Columns.Count; y++)
{
insertQuery += dataTable.Columns[y].ColumnName + ", ";
values += dataTable.Rows[x].ItemArray[y].ToString() + ", ";
}
insertQuery = insertQuery.Remove(insertQuery.Length - 2);
insertQuery += " )";
values = values.Remove(values.Length - 2);
values += " )";
insertQuery += " " + values;
SqlCommand insertCommand = new SqlCommand(insertQuery, destinationCon);
insertCommand.ExecuteNonQuery();
}
da.Dispose();
How can I correctly Achieve this functionality? I was thinking of maybe scrapping all the code and using SMO instead?

If you are only looking to copy the data (because you have structure creation already working), then you could use DataTable to hold the data in a non-dbms specific structure, and a DataAdapter to generate the dbms specific insert statements. Here is an excerpt from code I wrote a while ago to copy data from Access to MySQL:
List<string> tableNames = new List<string>();
try
{
// Open connect to access db
sourceConn.Open();
// Build table names list from schema
foreach (DataRow row in sourceConn.GetSchema("Tables").Select("table_type = 'TABLE'"))
tableNames.Add(row["table_name"].ToString());
}
catch (Exception ex)
{
throw ex;
}
finally
{
if(sourceConn.State != ConnectionState.Closed)
sourceConn.Close();
}
foreach (string table in tableNames)
{
//Get all table data from Access
string query = string.Format("SELECT * FROM {0}", table);
DataTable accessTable = new DataTable(table);
try
{
sourceConn.Open();
System.Data.OleDb.OleDbCommand accessSqlCommand = new System.Data.OleDb.OleDbCommand(query, accessConn);
System.Data.OleDb.OleDbDataReader reader = (System.Data.OleDb.OleDbDataReader)accessSqlCommand.ExecuteReader();
// Load all table data into accessTable
accessTable.Load(reader);
}
catch(Exception ex)
{
throw ex;
}
finally
{
if(sourceConn.State != ConnectionState.Closed)
sourceConn.Close();
}
// Import data into MySQL
accessTable.AcceptChanges();
// The table should be empty, so set everything as new rows (will be inserted)
foreach (DataRow row in accessTable.Rows)
row.SetAdded();
try
{
destConn.Open();
MySql.Data.MySqlClient.MySqlDataAdapter da = new MySql.Data.MySqlClient.MySqlDataAdapter(query, mySqlConn);
MySql.Data.MySqlClient.MySqlCommandBuilder cb = new MySql.Data.MySqlClient.MySqlCommandBuilder(da);
da.InsertCommand = cb.GetInsertCommand();
// Update the destination table 128 rows at a time
da.UpdateBatchSize = 128;
// Perform inserts (and capture row counts for output)
int insertCount = da.Update(accessTable);
}
catch (Exception ex)
{
throw ex;
}
finally
{
if(destConn.State != ConnectionState.Closed)
destConn.Close();
}
}
This could certainly be more efficient, but I wrote it for a quick conversion. Also, since this is copied and pasted you may need to tweak it. Hope it helps.

It might be worth thinking about using a linked server. Once a linked server is defined in the destination server, a table can be created and automatically filled with data using a SELECT…INTO statement.
Query executed in destination server database:
SELECT * INTO NewTableName FROM
SourceServername.SourceDatabasename.dbo.SourceTableName

Handling 'NULL' and key constraints when inserting data from a gridview

I'm trying to insert values into the database via gridview from a C# Windows application. I tried 2 different methods but neither seems to be working for me. The 2 type of code is shown below......
Assuming, even if the code below works.... I'm getting various errors regarding the primary key and foreign key constraints.......
Problem:
I have confactorID and macroID columns as integer with nullable in destination businesslogic table....... I'm not sure how to insert 'NULL' in these columns from the C# gridview tool...
Even if I give integer values as input there seems to be foreign key and primary key (duplication) constraint issues....
What do I need to change in my below code to resolve these issues.... I've been stuck with these problem for more than 8 hours... Any help is much appreciated.
Code type 1:
private void ADD_button_Click(object sender, EventArgs e)
{
try
{
using (SqlConnection con = new SqlConnection(sqlconn))
{
using (SqlCommand cmd = new SqlCommand())
{
cmd.Connection = con;
con.Open();
for (int i = 1; i < dataGridView.Rows.Count; i++)
{
string sql = #"INSERT INTO " + schemaName +"ERSBusinessLogic VALUES ("
+ dataGridView.Rows[i].Cells["ERSBusinessLogic_ID"].Value + ", '"
+ dataGridView.Rows[i].Cells["ERSBusinessLogic_Formula"].Value.ToString() + "', "
+ dataGridView.Rows[i].Cells["ERSBusinessLogic_InputsCount"].Value + ",'"
+ dataGridView.Rows[i].Cells["ERSBusinessLogic_Inputs"].Value.ToString() + "', "
+ dataGridView.Rows[i].Cells["ERSBusinessLogic_ConvFactorID"].Value + ", "
+ dataGridView.Rows[i].Cells["ERSBusinessLogic_MacroID"].Value + ", '"
+ dataGridView.Rows[i].Cells["ERSBusinessLogic_DataSeries"].Value.ToString() + "', '"
+ dataGridView.Rows[i].Cells["ERSBusinessLogic_InputTimeDimensionValue"].Value.ToString() + "', "
+ dataGridView.Rows[i].Cells["ERSBusinessLogic_InputTimeDimensionType"].Value + ", "
+ dataGridView.Rows[i].Cells["ERSBusinessLogic_GeographyDimensionID"].Value + ", "
+ dataGridView.Rows[i].Cells["ERSBusinessLogic_InputsUnitsIDs"].Value + ", '"
+ dataGridView.Rows[i].Cells["ERSBusinessLogic_Type"].Value + "', "
+ dataGridView.Rows[i].Cells["ERSBusinessLogic_PrivacyID"].Value + ", '"
+ dataGridView.Rows[i].Cells["ERSBusinessLogic_LongDesc"].Value.ToString() + "', '"
+ dataGridView.Rows[i].Cells["ERSBusinessLogic_InputSources"].Value.ToString() + "', '"
+ dataGridView.Rows[i].Cells["ERSBusinessLogic_OutputName"].Value.ToString() + "', "
+ dataGridView.Rows[i].Cells["ERSBusinessLogic_OutputUnitID"].Value + ", '"
+ dataGridView.Rows[i].Cells["ERSBusinessLogic_OutputDestination"].Value.ToString() + "', '"
+ dataGridView.Rows[i].Cells["ERSBusinessLogic_OutputTimeDimensionValue"].Value.ToString() + "', "
+ dataGridView.Rows[i].Cells["ERSBusinessLogic_OutputTimeDimensionType"].Value + ", "
+ dataGridView.Rows[i].Cells["ERSBusinessLogic_GroupID"].Value + ");";
if ((dataGridView.Rows[i].Cells["ERSBusinessLogic_ConvFactorID"].Value == " ") && (dataGridView.Rows[i].Cells["ERSBusinessLogic_MacroID"].Value == null))
{
Convert.ToInt32(dataGridView.Rows[i].Cells["ERSBusinessLogic_ConvFactorID"].Value = "NULL");
Convert.ToInt32 (dataGridView.Rows[i].Cells["ERSBusinessLogic_MacroID"].Value = "NULL");
cmd.CommandText = sql;
cmd.ExecuteNonQuery();
}
else
{
cmd.CommandText = sql;
cmd.ExecuteNonQuery();
}
}
}
}
}
catch (Exception ex)
{
MessageBox.Show("Error : " + ex.Message);
}
finally
{
con.Close();
}
}
Code type 2:
private void ADD_button_Click(object sender, EventArgs e)
{
// Getting data from DataGridView
DataTable myDt = new DataTable();
myDt = GetDTfromDGV(dataGridView);
// Writing to sql
WriteToSQL(myDt);
}
private DataTable GetDTfromDGV(DataGridView dgv)
{
// Making our DataTable
DataTable dt = new DataTable();
foreach (DataGridViewColumn column in dgv.Columns)
{
dt.Columns.Add(column.Name, typeof(string));
}
// Getting data
foreach (DataGridViewRow dgvRow in dgv.Rows)
{
DataRow dr = dt.NewRow();
for (int col = 0; col < dgv.Columns.Count; col++)
{
dr[col] = dgvRow.Cells[col].Value;
}
dt.Rows.Add(dr);
}
// removing empty rows
for (int row = dt.Rows.Count - 1; row >= 0; row--)
{
bool flag = true;
for (int col = 0; col < dt.Columns.Count; col++)
{
if (dt.Rows[row][col] != DBNull.Value)
{
flag = false;
break;
}
}
if (flag == true)
{
dt.Rows.RemoveAt(row);
}
}
return dt;
}
private void WriteToSQL(DataTable dt)
{
using (SqlConnection con = new SqlConnection(sqlconn))
{
SqlBulkCopy sqlBulkCopy = new SqlBulkCopy(con);
// Setting the database table name
sqlBulkCopy.DestinationTableName = "[AnimalProductsCoSD].[CoSD].[ERSBusinessLogic]";
// Mapping the DataTable columns with that of the database table
Convert.ToInt32 (sqlBulkCopy.ColumnMappings.Add(dt.Columns[0].ColumnName, "ERSBusinessLogic_ID"));
Convert.ToString(sqlBulkCopy.ColumnMappings.Add(dt.Columns[1].ColumnName, "ERSBusinessLogic_Formula"));
Convert.ToInt32 (sqlBulkCopy.ColumnMappings.Add(dt.Columns[2].ColumnName, "ERSBusinessLogic_InputsCount"));
Convert.ToString (sqlBulkCopy.ColumnMappings.Add(dt.Columns[3].ColumnName, "ERSBusinessLogic_Inputs"));
Convert.ToInt32 (sqlBulkCopy.ColumnMappings.Add(dt.Columns[4].ColumnName, "ERSBusinessLogic_ConvFactorID"));
Convert.ToInt32 (sqlBulkCopy.ColumnMappings.Add(dt.Columns[5].ColumnName, "ERSBusinessLogic_MacroID"));
Convert.ToString (sqlBulkCopy.ColumnMappings.Add(dt.Columns[6].ColumnName, "ERSBusinessLogic_DataSeries"));
Convert.ToString (sqlBulkCopy.ColumnMappings.Add(dt.Columns[7].ColumnName, "ERSBusinessLogic_InputTimeDimensionValue"));
Convert.ToInt32 (sqlBulkCopy.ColumnMappings.Add(dt.Columns[8].ColumnName, "ERSBusinessLogic_InputTimeDimensionType"));
Convert.ToInt32 (sqlBulkCopy.ColumnMappings.Add(dt.Columns[9].ColumnName, "ERSBusinessLogic_GeographyDimensionID"));
Convert.ToInt32 (sqlBulkCopy.ColumnMappings.Add(dt.Columns[10].ColumnName, "ERSBusinessLogic_InputsUnitsIDs"));
Convert.ToString (sqlBulkCopy.ColumnMappings.Add(dt.Columns[11].ColumnName, "ERSBusinessLogic_Type"));
Convert.ToInt32 (sqlBulkCopy.ColumnMappings.Add(dt.Columns[12].ColumnName, "ERSBusinessLogic_PrivacyID"));
Convert.ToString (sqlBulkCopy.ColumnMappings.Add(dt.Columns[13].ColumnName, "ERSBusinessLogic_LongDesc"));
Convert.ToString (sqlBulkCopy.ColumnMappings.Add(dt.Columns[14].ColumnName, "ERSBusinessLogic_InputSources"));
Convert.ToString (sqlBulkCopy.ColumnMappings.Add(dt.Columns[15].ColumnName, "ERSBusinessLogic_OutputName"));
Convert.ToInt32 (sqlBulkCopy.ColumnMappings.Add(dt.Columns[16].ColumnName, "ERSBusinessLogic_OutputUnitID"));
Convert.ToString (sqlBulkCopy.ColumnMappings.Add(dt.Columns[17].ColumnName, "ERSBusinessLogic_OutputDestination"));
Convert.ToString (sqlBulkCopy.ColumnMappings.Add(dt.Columns[18].ColumnName, "ERSBusinessLogic_OutputTimeDimensionValue"));
Convert.ToInt32 (sqlBulkCopy.ColumnMappings.Add(dt.Columns[19].ColumnName, "ERSBusinessLogic_OutputTimeDimensionType"));
Convert.ToInt32 (sqlBulkCopy.ColumnMappings.Add(dt.Columns[20].ColumnName, "ERSBusinessLogic_GroupID"));
con.Open();
sqlBulkCopy.WriteToServer(dt);
}
}
Thanks

First of all check your database table, columns that keeps IDs from another tables must allow null value like so:
And if your table ID is Identity column with auto increment you don't need to write ID, table automatically add ID.
If everything ok then try to do like so:
private DataTable GetDTfromDGV(DataGridView dgv)
{
// Macking our DataTable
DataTable dt = new DataTable();
//Another way to add columns
dt.Columns.AddRange(new DataColumn[5]
{
//new DataColumn("table_ID", typeof(string)), if table_ID is not Identity column with auto increment then uncomment
new DataColumn("sql_col2", typeof(string)),
new DataColumn("sql_col3", typeof(string)),
new DataColumn("sql_col4", typeof(string)),
new DataColumn("Table_2_ID", typeof(int)),
new DataColumn("Table_3_IDt", typeof(int))
});
// Getting data
foreach (DataGridViewRow dgvRow in dgv.Rows)
{
DataRow dr = dt.NewRow();
for (int col = 1; col < dgv.Columns.Count; col++) //if table_ID is not Identity column with auto increment then start with 0
{
dr[col - 1] = dgvRow.Cells[col].Value == null ? DBNull.Value : dgvRow.Cells[col].Value;
}
dt.Rows.Add(dr);
}
// removing empty rows
....
return dt;
}
private void WriteToSQL(DataTable dt)
{
string connectionStringSQL = "Your connection string";
using (SqlConnection sqlConn = new SqlConnection(connectionStringSQL))
{
SqlBulkCopy sqlBulkCopy = new SqlBulkCopy(sqlConn);
// Setting the database table name
sqlBulkCopy.DestinationTableName = "Table_1";
// Mapping the DataTable columns with that of the database table
//sqlBulkCopy.ColumnMappings.Add(dt.Columns[0].ColumnName, "table_ID"); table_ID is Identity column with auto increment
sqlBulkCopy.ColumnMappings.Add(dt.Columns[0].ColumnName, "sql_col2");
sqlBulkCopy.ColumnMappings.Add(dt.Columns[1].ColumnName, "sql_col3");
sqlBulkCopy.ColumnMappings.Add(dt.Columns[2].ColumnName, "sql_col4");
sqlBulkCopy.ColumnMappings.Add(dt.Columns[3].ColumnName, "Table_2_ID");
sqlBulkCopy.ColumnMappings.Add(dt.Columns[4].ColumnName, "Table_3_ID");
sqlConn.Open();
sqlBulkCopy.WriteToServer(dt);
}
}
I tried and that's what I got:

You could use parameterized query.
For example:
var sqlcommand = new SqlCommand
{
CommandText = "INSERT INTO TABLE(Column1,Column2) VALUES(#Column1Value,#Column2Value)"
};
var param1 = new SqlParameter("#Column1Value", SqlDbType.Int)
{
Value = (String.IsNullOrWhiteSpace(dataGridView.Rows[i].Cells["ERSBusinessLogic_ConvFactorID"].Value)) ? DBNull.Value: (object)(dataGridView.Rows[i].Cells["ERSBusinessLogic_ConvFactorID"].Value)
};
var param2 = new SqlParameter("#Column2Value", SqlDbType.Int)
{
Value = (String.IsNullOrWhiteSpace(dataGridView.Rows[i].Cells["ERSBusinessLogic_MacroID"].Value)) ? DBNull.Value : (object)dataGridView.Rows[i].Cells["ERSBusinessLogic_MacroID"].Value)
};
sqlcommand.Parameters.Add(param1);
sqlcommand.Parameters.Add(param2);

If you use method 1 that you tried, you'll probably want to create SqlParameter objects and parameterize your query. Refer to this SO post: Right syntax of SqlParameter. That being said, you just want to get it to work first I'm sure. You could check the value of the DataGridViewCell's Value property for the convFactorID and macroID. If either of these are null, then you can assign a string the text "NULL". For brevity, I've used the C# conditional operator (https://msdn.microsoft.com/en-us/library/ty67wk28.aspx). This is one way you might do what I'm describing:
string convFactorIDText = (dataGridView.Rows[i].Cells["ERSBusinessLogic_ConvFactorID"].Value == null) ? "NULL" : dataGridView.Rows[i].Cells["ERSBusinessLogic_ConvFactorID"].Value.ToString();
string macroIDText = (dataGridView.Rows[i].Cells["ERSBusinessLogic_MacroID"].Value == null) ? "NULL" : dataGridView.Rows[i].Cells["ERSBusinessLogic_MacroID"].Value.ToString();
Then alter you SQL to include the string variables that contain either a actual value or NULL.
string sql = string.Format(#"INSERT INTO {0}.ERSBusinessLogic VALUES ({1}, '{2}', {3}, {4}, {5}, {6}"),
schemaName,
dataGridView.Rows[i].Cells["ERSBusinessLogic_ID"].Value,
dataGridView.Rows[i].Cells["ERSBusinessLogic_Formula"].Value.ToString(),
dataGridView.Rows[i].Cells["ERSBusinessLogic_InputsCount"].Value,
dataGridView.Rows[i].Cells["ERSBusinessLogic_Inputs"].Value,
convFactorIDText,
macroIDText
// and so forth
);

Insert DateTime into Access

The problem:
I'm trying to insert a date time into an access database using the Oledb interface in C#.
Hacking solution: Generate my on insert string without using command.Properties
I can insert text into the database with no problem, but when trying datetime, I end up with this error: System.Data.OleDb.OleDbException {"Data type mismatch in criteria expression."}
There are several posts similar to this but alas with no working solution.
Here is my code:
void TransferData()
{
string instCmd = Get_InsertCommand(0); // hard coded table 0 for testing
Fill_ProductTable_ToInsert();
con.Open();
// It would be nice not to have to separate the date indexes
int[] textIndex = { 0, 1, 2, 3, 4, 7 };
int[] dateIndex = { 5, 6 };
try
{
foreach (DataRow row in DataToStore.Tables[0].Rows)
{
OleDbCommand command = new OleDbCommand();
command.Connection = con;
command.CommandText = instCmd;
foreach(int j in textIndex)
command.Parameters.AddWithValue("#" + j, row[j]);
foreach (int j in dateIndex)
{
// TESTING CODE
///////////////////////////////////////////////////////////////////////////
string input = "#\'" +DateTime.Now.ToString("yyyy-MM-dd hh:mm:ss") +"\'#";
command.Parameters.AddWithValue("#" + j, input.ToString());
Program.WriteLine(input.ToString());
///////////////////////////////////////////////////////////////////////////
}
command.ExecuteNonQuery();
}
}
finally
{
con.Close();
}
}
string Get_InsertCommand(int i)
{
string sqlIns = "INSERT INTO " + DataToStore.Tables[0].TableName + " (";
string temp = "VALUES (";
for (int j = 0; j < expected_header[i].Length - 1; j++)
{
sqlIns += expected_header[i][j] + ", ";
temp += "#" + j + ", ";
}
int lastIndex = expected_header[i].Length -1;
sqlIns += expected_header[i][lastIndex] + ") ";
temp += "#" + lastIndex + ")";
sqlIns += temp;
return sqlIns;
}
Inside the area labeled testing code, I have tried every permutation of date time I could think of.
I tried every format with # and '
I tried these formats: yyyy-MM-dd, yyyyMMdd, yyyy\MM\dd, yyyy/MM/dd
I also tried ToOADate()
And ToString(), ToShortDateString()
I also tried setting the database to accept ANSI-92 Sql
I'm running out of ideas.
Note: This code is set up to deal with multiple tables from multiple databases, mind the loops...

Use parameters properly, and don't worry about the format of the datetime value that you concatenate in your query.
I don't understand why you want to convert the datetime value to a string value ?
DateTime theDate = new DateTime(2012,10,16);
var cmd = new OleDbCommand();
cmd.CommandText = "INSERT INTO sometable (column) VALUES (#p_bar)";
cmd.Parameters.Add ("#p_bar", OleDbType.DateTime).Value = theDate;

I was able to solve this issue by not using command properties. I generated my own sql input and set it to cmd.commandText. The text input for datetime to a data base is #yyyy-MM-dd#

How to write: insert into table ALL except X, if statement

Second question of all time on this community! I am a noob and my weakness are if statements within or amoungst loops and other if statements.
So here is my scenario. This method inserts anything into a database, but I want to validate something. Instead of adding anything into the database, I do not want anything entered in that begins with "LIFT", I want the method to skip over that line and proceed to the next one. Is there a way I can program this into this method? Or do I need to write a new method? Thanks a bunch!
public bool BatchInsert(string table, string[] values)
{
string statement = "INSERT INTO " + table + " VALUES(";
for (var i = 0; i < values.Length - 1; i++)
{
if(values[i].Contains("'")){
values[i] = values[i].Replace("'", "''");
}
statement += "'"+values[i]+"', ";
}
statement += "'" + values[values.Length - 1] + "');";
SqlCommand comm = new SqlCommand(statement, connectionPCICUSTOM);
try
{
comm.Connection.Open();
comm.ExecuteNonQuery();
}
catch (Exception e)
{
KaplanFTP.errorMsg = "Database error: " + e.Message;
}
finally
{
comm.Connection.Close();
}
return true;
}

A couple hints. Don't += string types as it slows down performance. I also prefer foreach loops as the code is cleaner and easier to read/less likely to mess up the index. Also make using of the using statement to ensure proper disposal.
Assuming you have a reference to System.Linq you can use the following. I didn't test it but it should work:
public bool BatchInsert(string table, IEnumerable<string> values)
{
var sql = new StringBuilder();
sql.Append("INSERT INTO " + table + " VALUES(");
var newValues = values.Where(x => !x.StartsWith("LIFT")).Select(x => string.Format("'{0}'", x.Replace("'", "''")));
sql.Append(string.Join("","", newValues.ToArray()));
sql.Append(")");
using (var comm = new SqlCommand(statement, connectionPCICUSTOM))
{
try
{
comm.Connection.Open();
comm.ExecuteNonQuery();
}
catch (Exception e)
{
KaplanFTP.errorMsg = "Database error: " + e.Message;
}
finally
{
comm.Connection.Close();
}
}
return true;
}

If your goal is to iterate through your collection of 'values', leaving values beginning with 'lift' and their corresponding columns untouched, you may have to revise the way your INSERT Query is constructed. You will add columns as needed, instead of assuming that each value will be accounted for. Basically, you will need to use the form:
INSERT INTO tablename (col1, col2...) VALUES (val1, val2...)
For example:
string statement = "INSERT INTO tablename ";
string columns = "(";
string values = "(";
for (var i = 0; i < values.Length - 1; i++)
{
//if values doesn't contain lift, add it to the statement
if(!values[i].contains("LIFT")){
//columnName is a collection of your db column names
columns += "'"+columnName[i]+"'";
values += "'"+values[i]+"'";
}
}
columns += ")";
values += ")";
statement += columns +" VALUES " + values;
Like some of the comments have stated, this approach opens you up to SQL injections. Use with caution.
EDIT : Sorry, I missed where you said 'starts with 'LIFT'. Revise the .contains() line to the following:
if(!values[i].StartsWith("LIFT")){