static void EXECUDFExample()
{
using (SqlDatabaseConnection cnn = new SqlDatabaseConnection("schemaname=db;uri=file://" + ExampleDatabaseFile + "; "))
{
cnn.Open();
// Available from version 2.7
using (SqlDatabaseCommand cmd = new SqlDatabaseCommand())
{
cmd.Connection = cnn;
// SELECT - ExecScalarUDF
// ExecScalarUDF is called once for each row for each call.
// Following will call the event handler twice as ExecScalarUDF is called twice.
DataTable dt = new DataTable();
cmd.CommandText = "SELECT *, ExecScalarUDF('Exec1', Phone) AS ANumber, ExecScalarUDF('Exec2', 1, 2, @Param1, FirstName ) AS ExampleText FROM Customers LIMIT 10;";
cmd.Parameters.AddWithValue("@Param1", 3);
SqlDatabaseDataReader dr = cmd.ExecuteReader();
for (int c = 0; c < dr.VisibleFieldCount; c++)
{
Console.Write(dr.GetName(c) + "\t");
}
Console.WriteLine(Environment.NewLine + "----------------------");
while (dr.Read())
{
for (int c = 0; c < dr.VisibleFieldCount; c++)
{
Console.Write(dr.GetValue(c) + "\t");
}
Console.WriteLine("");
}
;
}
}
}
public int ExportTable(string FilePathAndName, bool AppendToFile = false)
{
int _row_count = 0;
using (SqlDatabaseCommand cmd = new SqlDatabaseCommand(SQLDatabaseConnection))
{
if (SQLDatabaseTransaction != null)
{
cmd.Transaction = SQLDatabaseTransaction;
}
cmd.CommandText = string.Format("SELECT * FROM [{0}].[{1}]", SchemaName, TableName);
using (CsvWriter = new CsvFileWriter(FilePathAndName, AppendToFile, Encoding.UTF8))
{
SqlDatabaseDataReader dataReader = cmd.ExecuteReader();
List <string> ColumnNames = new List <string>();
// Write header i.e. column names
for (int i = 0; i < dataReader.VisibleFieldCount; i++)
{
if (dataReader.GetFieldType(i) != Type.GetType("byte[]")) // BLOB will not be written
{
ColumnNames.Add(dataReader.GetName(i)); //maintain columns in the same order as the header line.
CsvWriter.AddField(dataReader.GetName(i));
}
}
CsvWriter.SaveAndCommitLine();
// Write data i.e. rows.
while (dataReader.Read())
{
foreach (string ColumnName in ColumnNames)
{
CsvWriter.AddField(dataReader.GetString(dataReader.GetOrdinal(ColumnName))); //dataReader.GetOrdinal(ColumnName) provides the position.
}
CsvWriter.SaveAndCommitLine();
_row_count++; //Increase row count to track number of rows written.
}
}
}
return(_row_count);
}
public long ExportTable(string filePathAndName, bool appendToFile = false)
{
SQLDatabaseConnection.Open();
long rowCount = 0;
using (SqlDatabaseCommand cmd = new SqlDatabaseCommand(SQLDatabaseConnection))
{
if (SQLDatabaseTransaction != null)
{
cmd.Transaction = SQLDatabaseTransaction;
}
cmd.CommandText = $@"SELECT * FROM [{SchemaName}].[{TableName}]";
using (DelimitedWriter = new DelimitedFileWriter(filePathAndName, appendToFile, Encoding.UTF8))
{
// set variables
DelimitedWriter.Delimiter = Delimiter;
DelimitedWriter.QuoteWrap = ReplicationFormData.QuoteWrap;
DelimitedWriter.NullValue = ReplicationFormData.NullValue;
// write custom header to file if not empty
if (!string.IsNullOrWhiteSpace(ReplicationFormData.CustomHeader))
{
DelimitedWriter.WriteLineToFile(ReplicationFormData.CustomHeader);
}
SqlDatabaseDataReader dataReader = cmd.ExecuteReader();
List <string> columnNames = new List <string>();
// Write header i.e. column names
for (int i = 0; i < dataReader.VisibleFieldCount; i++)
{
var name = dataReader.GetName(i);
if (dataReader.GetFieldType(i) != Type.GetType("byte[]") &&
name != Constants.ReplicationRecordId &&
name != Constants.ReplicationVersionIds &&
name != Constants.ReplicationVersionRecordId) // BLOB will not be written
{
columnNames.Add(name); //maintain columns in the same order as the header line.
DelimitedWriter.AddField(name);
}
}
DelimitedWriter.SaveAndCommitLine();
// Write data i.e. rows.
while (dataReader.Read())
{
foreach (string columnName in columnNames)
{
DelimitedWriter.AddField(
dataReader.GetString(
dataReader.GetOrdinal(
columnName))); //dataReader.GetOrdinal(ColumnName) provides the position.
}
DelimitedWriter.SaveAndCommitLine();
rowCount++; //Increase row count to track number of rows written.
}
}
}
return(rowCount);
}
static void EncryptionDecryption()
{
Console.WriteLine("*************** Encrypted File Example *******************");
using (SqlDatabaseConnection cnn = new SqlDatabaseConnection("SchemaName=db;uri=file://Encrypted.db;"))
{
cnn.Open();
using (SqlDatabaseCommand cmd = new SqlDatabaseCommand(cnn))
{
//Entire Database File will be encrypted using AES 256
cmd.CommandText = "SYSCMD Key='SecretPassword';";
cmd.ExecuteNonQuery();
cmd.CommandText = "Create table if not exists Users(id integer primary key autoincrement, Username Text, Password Text); ";
cmd.ExecuteNonQuery();
cmd.CommandText = "INSERT INTO Users values(NULL, @username, @password);";
cmd.Parameters.AddWithValue("@username", "sysdba");
cmd.Parameters.AddWithValue("@password", "SecretPassword");
cmd.ExecuteNonQuery();
}
}
using (SqlDatabaseConnection cnn = new SqlDatabaseConnection("SchemaName=db;uri=file://Encrypted.db;"))
{
cnn.Open();
using (SqlDatabaseCommand cmd = new SqlDatabaseCommand(cnn))
{
//Entire Database File will be encrypted using AES 256
cmd.CommandText = "SYSCMD Key = 'SecretPassword'; "; //If incorrect password library will not respond.
cmd.ExecuteNonQuery();
// COLLATE BINARY performs case sensitive search for password
// see http://www.sqldatabase.net/docs/syscmd.aspx for available collation sequences.
cmd.CommandText = "SELECT Id FROM Users WHERE Username = @username AND Password = @password COLLATE BINARY;";
cmd.Parameters.AddWithValue("@username", "sysdba");
cmd.Parameters.AddWithValue("@password", "SecretPassword");
Console.WriteLine("User Found {0}", cmd.ExecuteScalar() == null ? "No" : "Yes");
}
}
Console.Write(string.Empty);
Console.WriteLine("*************** Encrypted Column Example *******************");
string RandomUserName = "******" + System.IO.Path.GetRandomFileName();
using (SqlDatabaseConnection cnn = new SqlDatabaseConnection("SchemaName=db;uri=file://EncryptedColumn.db;"))
{
cnn.Open();
using (SqlDatabaseCommand cmd = new SqlDatabaseCommand(cnn))
{
cmd.CommandText = "CREATE TABLE IF NOT EXISTS UsersCreditCards(Name Text Primary Key, CreditCardNumber Text); ";
cmd.ExecuteNonQuery();
cmd.CommandText = "INSERT INTO UsersCreditCards values(@Name, EncryptText(@CreditCardNumber , 'SecretPassword'));";
cmd.Parameters.AddWithValue("@Name", RandomUserName);
cmd.Parameters.AddWithValue("@CreditCardNumber", "1234-5678");
cmd.ExecuteNonQuery();
}
}
using (SqlDatabaseConnection cnn = new SqlDatabaseConnection("SchemaName=db;uri=file://EncryptedColumn.db;"))
{
cnn.Open();
using (SqlDatabaseCommand cmd = new SqlDatabaseCommand(cnn))
{
cmd.CommandText = "SELECT DecryptText(CreditCardNumber , 'SecretPassword') AS [CreditCardNumber] FROM UsersCreditCards WHERE Name = @Name LIMIT 1;";
cmd.Parameters.AddWithValue("@Name", RandomUserName);
Console.WriteLine("User {0} Credit Card Number is : {1}", RandomUserName, cmd.ExecuteScalar());
Console.WriteLine("*************** All Users *******************");
cmd.CommandText = "SELECT Name, DecryptText(CreditCardNumber , 'SecretPassword') AS CreditCardNumber FROM UsersCreditCards;";
SqlDatabaseDataReader dr = cmd.ExecuteReader();
for (int c = 0; c < dr.VisibleFieldCount; c++)
{
Console.Write(dr.GetName(c) + "\t");
}
Console.WriteLine(Environment.NewLine + "----------------------");
while (dr.Read())
{
for (int c = 0; c < dr.VisibleFieldCount; c++)
{
Console.Write(dr.GetValue(c) + "\t");
}
Console.WriteLine("");
}
;
}
}
if (File.Exists("Encrypted.db"))
{
File.Delete("Encrypted.db");
}
if (File.Exists("EncryptedColumn.db"))
{
File.Delete("EncryptedColumn.db");
}
}
static void MultiThreading()
{
using (SqlDatabaseConnection cnn = new SqlDatabaseConnection("schemaname=db;uri=file://@memory;")) // In Memory database.
{
try
{
cnn.Open();
if (cnn.State != ConnectionState.Open)
{
Console.WriteLine("Unable to open connection.");
return;
}
}
catch (SqlDatabaseException e)
{
Console.WriteLine("Error: {0}", e.Message);
return;
}
using (SqlDatabaseCommand cmd = new SqlDatabaseCommand())
{
cmd.Connection = cnn;
cmd.CommandText = "CREATE TABLE IF NOT EXISTS TestTable (ThreadId Integer, Id Integer, RandomText Text, ByteArray Blob);";
cmd.ExecuteNonQuery();
}
Random rnd = new Random();
Parallel.For(0, Environment.ProcessorCount,
new ParallelOptions
{
MaxDegreeOfParallelism = Environment.ProcessorCount
},
i => {
using (SqlDatabaseCommand cmd = new SqlDatabaseCommand())
{
cmd.Connection = cnn;
string RandomPathForText = System.IO.Path.GetRandomFileName();
cmd.CommandText = "INSERT INTO TestTable VALUES (@ThreadId, @Id, @RandomText, @ByteArray);";
if (!cmd.Parameters.Contains("@ThreadId"))
{
cmd.Parameters.AddWithValue("@ThreadId", System.Threading.Thread.CurrentThread.ManagedThreadId);
}
else
{
cmd.Parameters["@ThreadId"].Value = System.Threading.Thread.CurrentThread.ManagedThreadId;
}
if (!cmd.Parameters.Contains("@Id"))
{
cmd.Parameters.AddWithValue("@Id", rnd.Next(1, 100));
}
else
{
cmd.Parameters["@Id"].Value = rnd.Next(1, 100);
}
if (!cmd.Parameters.Contains("@RandomText"))
{
cmd.Parameters.AddWithValue("@RandomText", RandomPathForText);
}
else
{
cmd.Parameters["@RandomText"].Value = RandomPathForText;
}
if (!cmd.Parameters.Contains("@ByteArray"))
{
cmd.Parameters.AddWithValue("@ByteArray", Encoding.UTF8.GetBytes(RandomPathForText));
}
else
{
cmd.Parameters["@ByteArray"].Value = Encoding.UTF8.GetBytes(RandomPathForText);
}
cmd.ExecuteNonQuery();
}
});
using (SqlDatabaseCommand cmd = new SqlDatabaseCommand(cnn))
{
cmd.CommandText = "SELECT * FROM TestTable; ";
cmd.ExecuteNonQuery();
SqlDatabaseDataReader dr = cmd.ExecuteReader();
while (dr.Read())
{
for (int c = 0; c < dr.VisibleFieldCount; c++)
{
//Console.Write(Encoding.UTF8.GetString(dr.GetFieldValue<byte[]>(c)) + "\t");
//byte[] byteArray = (byte[])dr.GetValue(c);
if (dr.GetName(c).Equals("ByteArray"))
{
Console.Write(Encoding.UTF8.GetString(dr.GetFieldValue <byte[]>(c)) + "\t");
}
else
{
Console.Write(dr.GetValue(c) + "\t");
}
}
Console.WriteLine("");
}
}
}
}
private void CreateDropTable_Click(object sender, EventArgs e)
{
//Create file name
string dbfilepath = Path.Combine(Path.GetDirectoryName(Application.ExecutablePath), "tempdb.db");
//Connection string
string strCon = "schemaname=db;uri=file://" + dbfilepath + ";";
using (SqlDatabaseConnection cnn = new SqlDatabaseConnection(strCon))
{
//Either open the existing database file or create new.
//Other option is DatabaseFileMode.OpenIfExists in which new file is not created.
cnn.DatabaseFileMode = DatabaseFileMode.OpenOrCreate;
//Since we are creating new table, database must be opened in ReadWrite mode.
cnn.DatabaseMode = DatabaseMode.ReadWrite;
try
{
cnn.Open();
} catch (SqlDatabaseException dbe)
{
Debug.WriteLine(dbe.Message);
return;
}
// Check if database connection is open before we create command object to query.
if (cnn.State == ConnectionState.Open)
{
using (SqlDatabaseCommand cmd = new SqlDatabaseCommand())
{
// Assign the connection to this command object.
cmd.Connection = cnn;
cmd.CommandText = "DROP TABLE IF EXISTS ATableName; ";
cmd.ExecuteNonQuery();
StringBuilder sb = new StringBuilder();
sb.AppendLine("CREATE TABLE IF NOT EXISTS ATableName ");
sb.AppendLine(" ( ");
sb.AppendLine(" Id INTEGER PRIMARY KEY AUTOINCREMENT "); // Column with integer data types
sb.AppendLine(" , ProductName TEXT "); // Column with Text data type with no max number of characters same as varchar or string
sb.AppendLine(" , Price REAL "); // double, float or decimal datatype used for money.
sb.AppendLine(" , Picture BLOB "); // BLOB data type for bytes.
sb.AppendLine(" , MoreInfo NONE "); // Not sure and no preference
sb.AppendLine(" ) ");
cmd.CommandText = sb.ToString();
cmd.ExecuteNonQuery();
//SYS_OBJECTS Stores the table , you can verify that table exists or get the original sql from sqltext column.
sb.Clear();
sb.AppendLine("SELECT type [Object Type], crdatetime AS [DateTime Created], tablename [Table Name] FROM SYS_OBJECTS WHERE type = 'table' AND Name = 'ATableName';");
cmd.CommandText = sb.ToString();
SqlDatabaseDataReader dr = cmd.ExecuteReader();
while (dr.Read())
{
// Column Names using GetName function
for (int c = 0; c < dr.VisibleFieldCount; c++)
{
Debug.Write(dr.GetName(c).ToString() + "\t");
}
Debug.WriteLine(Environment.NewLine + "-------------------------------------------");
// Row values
for (int c = 0; c < dr.VisibleFieldCount; c++)
{
Debug.Write(dr.GetValue(c).ToString() + "\t");
}
}
// Drop the table
sb.Clear();
sb.Append("DROP TABLE IF EXISTS ATableName ; ");
cmd.CommandText = sb.ToString();
cmd.ExecuteNonQuery();
}
}
}
try
{
if (File.Exists(dbfilepath))
{
File.Delete(dbfilepath);
}
} catch (IOException ex)
{
throw ex;
}
}