public static DataTable GetDataTable(string query)
{
DataSet tempDataSet = new DataSet();
SqliteDataAdapter tempAdapter = null;
try
{
__connection.Open();
tempAdapter = new SqliteDataAdapter(query, __connection);
tempDataSet.Reset();
tempAdapter.Fill(tempDataSet);
}
catch (Exception ex)
{
throw new InvalidOperationException("Error in the DataBase", ex);
}
finally
{
if (tempAdapter != null)
tempAdapter.Dispose();
__connection.Close();
}
return tempDataSet.Tables[0];
}
/// <summary>
/// 查询数据集
/// </summary>
/// <param name="cmd">SQLiteCommand对象</param>
/// <returns>返回数据集</returns>
public static DataSet ExecuteDataSet (SqliteCommand cmd)
{
if (cmd.Connection.State == ConnectionState.Closed)
cmd.Connection.Open ();
DataSet ds = new DataSet ();
SqliteDataAdapter da = new SqliteDataAdapter (cmd);
da.Fill (ds);
da.Dispose ();
cmd.Connection.Close ();
cmd.Dispose ();
return ds;
}
static void Test(bool v3, string encoding) {
if (!v3)
Console.WriteLine("Testing Version 2" + (encoding != null ? " with " + encoding + " encoding" : ""));
else
Console.WriteLine("Testing Version 3");
System.IO.File.Delete("SqliteTest.db");
SqliteConnection dbcon = new SqliteConnection();
// the connection string is a URL that points
// to a file. If the file does not exist, a
// file is created.
// "URI=file:some/path"
string connectionString =
"URI=file:SqliteTest.db";
if (v3)
connectionString += ",Version=3";
if (encoding != null)
connectionString += ",encoding=" + encoding;
dbcon.ConnectionString = connectionString;
dbcon.Open();
SqliteCommand dbcmd = new SqliteCommand();
dbcmd.Connection = dbcon;
dbcmd.CommandText =
"CREATE TABLE MONO_TEST ( " +
"NID INT, " +
"NDESC TEXT, " +
"NTIME DATETIME); " +
"INSERT INTO MONO_TEST " +
"(NID, NDESC, NTIME) " +
"VALUES(1,'One (unicode test: \u05D0)', '2006-01-01')";
Console.WriteLine("Create & insert modified rows = 1: " + dbcmd.ExecuteNonQuery());
dbcmd.CommandText =
"INSERT INTO MONO_TEST " +
"(NID, NDESC, NTIME) " +
"VALUES(:NID,:NDESC,:NTIME)";
dbcmd.Parameters.Add( new SqliteParameter("NID", 2) );
dbcmd.Parameters.Add( new SqliteParameter(":NDESC", "Two (unicode test: \u05D1)") );
dbcmd.Parameters.Add( new SqliteParameter(":NTIME", DateTime.Now) );
Console.WriteLine("Insert modified rows with parameters = 1, 2: " + dbcmd.ExecuteNonQuery() + " , " + dbcmd.LastInsertRowID());
dbcmd.CommandText =
"INSERT INTO MONO_TEST " +
"(NID, NDESC, NTIME) " +
"VALUES(3,'Three, quoted parameter test, and next is null; :NTIME', NULL)";
Console.WriteLine("Insert with null modified rows and ID = 1, 3: " + dbcmd.ExecuteNonQuery() + " , " + dbcmd.LastInsertRowID());
dbcmd.CommandText =
"INSERT INTO MONO_TEST " +
"(NID, NDESC, NTIME) " +
"VALUES(4,'Four with ANSI char: ü', NULL)";
Console.WriteLine("Insert with ANSI char ü = 1, 4: " + dbcmd.ExecuteNonQuery() + " , " + dbcmd.LastInsertRowID());
dbcmd.CommandText =
"INSERT INTO MONO_TEST " +
"(NID, NDESC, NTIME) " +
"VALUES(?,?,?)";
dbcmd.Parameters.Clear();
IDbDataParameter param1 = dbcmd.CreateParameter();
param1.DbType = DbType.DateTime;
param1.Value = 5;
dbcmd.Parameters.Add(param1);
IDbDataParameter param2 = dbcmd.CreateParameter();
param2.Value = "Using unnamed parameters";
dbcmd.Parameters.Add(param2);
IDbDataParameter param3 = dbcmd.CreateParameter();
param3.DbType = DbType.DateTime;
param3.Value = DateTime.Parse("2006-05-11 11:45:00");
dbcmd.Parameters.Add(param3);
Console.WriteLine("Insert with unnamed parameters = 1, 5: " + dbcmd.ExecuteNonQuery() + " , " + dbcmd.LastInsertRowID());
dbcmd.CommandText =
"SELECT * FROM MONO_TEST";
SqliteDataReader reader;
reader = dbcmd.ExecuteReader();
Console.WriteLine("read and display data...");
while(reader.Read())
for (int i = 0; i < reader.FieldCount; i++)
Console.WriteLine(" Col {0}: {1} (type: {2}, data type: {3})",
i, reader[i] == null ? "(null)" : reader[i].ToString(), reader[i] == null ? "(null)" : reader[i].GetType().FullName, reader.GetDataTypeName(i));
dbcmd.CommandText = "SELECT NDESC FROM MONO_TEST WHERE NID=2";
Console.WriteLine("read and display a scalar = 'Two': " + dbcmd.ExecuteScalar());
dbcmd.CommandText = "SELECT count(*) FROM MONO_TEST";
Console.WriteLine("read and display a non-column scalar = 3: " + dbcmd.ExecuteScalar());
Console.WriteLine("read and display data using DataAdapter/DataSet...");
SqliteDataAdapter adapter = new SqliteDataAdapter("SELECT * FROM MONO_TEST", connectionString);
DataSet dataset = new DataSet();
adapter.Fill(dataset);
foreach(DataTable myTable in dataset.Tables){
foreach(DataRow myRow in myTable.Rows){
foreach (DataColumn myColumn in myTable.Columns){
Console.WriteLine(" " + myRow[myColumn]);
}
}
}
/*Console.WriteLine("read and display data using DataAdapter/DataTable...");
DataTable dt = new DataTable();
adapter.Fill(dt);
DataView dv = new DataView(dt);
foreach (DataRowView myRow in dv) {
foreach (DataColumn myColumn in myRow.Row.Table.Columns) {
Console.WriteLine(" " + myRow[myColumn.ColumnName]);
}
}*/
try {
dbcmd.CommandText = "SELECT NDESC INVALID SYNTAX FROM MONO_TEST WHERE NID=2";
dbcmd.ExecuteNonQuery();
Console.WriteLine("Should not reach here.");
} catch (Exception e) {
Console.WriteLine("Testing a syntax error: " + e.GetType().Name + ": " + e.Message);
}
/*try {
dbcmd.CommandText = "SELECT 0/0 FROM MONO_TEST WHERE NID=2";
Console.WriteLine("Should not reach here: " + dbcmd.ExecuteScalar());
} catch (Exception e) {
Console.WriteLine("Testing an execution error: " + e.GetType().Name + ": " + e.Message);
}*/
dataset.Dispose();
adapter.Dispose();
reader.Close();
dbcmd.Dispose();
dbcon.Close();
}
/// <summary>
/// 查询数据集
/// </summary>
/// <param name="cn">连接.</param>
/// <param name="commandText">查询语句.</param>
/// <param name="paramList">object参数列表.</param>
/// <returns></returns>
public static DataSet ExecuteDataSet (string commandText, params object[] paramList)
{
SqliteCommand cmd = Conn.CreateCommand ();
cmd.CommandText = commandText;
if (paramList != null) {
AttachParameters (cmd, commandText, paramList);
}
DataSet ds = new DataSet ();
if (Conn.State == ConnectionState.Closed)
Conn.Open ();
SqliteDataAdapter da = new SqliteDataAdapter (cmd);
da.Fill (ds);
da.Dispose ();
cmd.Dispose ();
Conn.Close ();
return ds;
}
