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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Duplicati.Library.Localization.Short;
namespace Duplicati.Library.Main.Database
{
public static class ExtensionMethods
{
public static void AddParameters(this System.Data.IDbCommand self, int count)
{
for(var i = 0; i < count; i++)
self.Parameters.Add(self.CreateParameter());
}
public static void AddParameter(this System.Data.IDbCommand self)
{
self.Parameters.Add(self.CreateParameter());
}
public static void AddParameter<T>(this System.Data.IDbCommand self, T value, string name = null)
{
var p = self.CreateParameter();
p.Value = value;
if (!string.IsNullOrEmpty(name))
p.ParameterName = name;
self.Parameters.Add(p);
}
public static void SetParameterValue<T>(this System.Data.IDbCommand self, int index, T value)
{
((System.Data.IDataParameter)self.Parameters[index]).Value = value;
}
public static int ExecuteNonQuery(this System.Data.IDbCommand self, string cmd, params object[] values)
{
if (cmd != null)
self.CommandText = cmd;
if (values != null && values.Length > 0)
{
self.Parameters.Clear();
foreach (var n in values)
self.AddParameter(n);
}
using(new Logging.Timer(LC.L("ExecuteNonQuery: {0}", self.CommandText)))
return self.ExecuteNonQuery();
}
public static object ExecuteScalar(this System.Data.IDbCommand self, string cmd, params object[] values)
{
if (cmd != null)
self.CommandText = cmd;
if (values != null && values.Length > 0)
{
self.Parameters.Clear();
foreach (var n in values)
self.AddParameter(n);
}
using(new Logging.Timer(LC.L("ExecuteScalar: {0}", self.CommandText)))
return self.ExecuteScalar();
}
public static long ExecuteScalarInt64(this System.Data.IDbCommand self, long defaultvalue = -1)
{
return ExecuteScalarInt64(self, null, defaultvalue, null);
}
public static long ExecuteScalarInt64(this System.Data.IDbCommand self, string cmd, long defaultvalue = -1)
{
return ExecuteScalarInt64(self, cmd, defaultvalue, null);
}
public static long ExecuteScalarInt64(this System.Data.IDbCommand self, string cmd, long defaultvalue, params object[] values)
{
if (cmd != null)
self.CommandText = cmd;
if (values != null && values.Length > 0)
{
self.Parameters.Clear();
foreach (var n in values)
self.AddParameter(n);
}
using(new Logging.Timer(LC.L("ExecuteScalar: {0}", self.CommandText)))
using(var rd = self.ExecuteReader())
if (rd.Read())
return ConvertValueToInt64(rd, 0, defaultvalue);
return defaultvalue;
}
public static System.Data.IDataReader ExecuteReader(this System.Data.IDbCommand self, string cmd, params object[] values)
{
if (cmd != null)
self.CommandText = cmd;
if (values != null && values.Length > 0)
{
self.Parameters.Clear();
foreach (var n in values)
self.AddParameter(n);
}
using(new Logging.Timer(LC.L("ExecuteReader: {0}", self.CommandText)))
return self.ExecuteReader();
}
public static IEnumerable<System.Data.IDataReader> ExecuteReaderEnumerable(this System.Data.IDbCommand self, string cmd, params object[] values)
{
using(var rd = ExecuteReader(self, cmd, values))
while (rd.Read())
yield return rd;
}
public static string ConvertValueToString(this System.Data.IDataReader reader, int index)
{
var v = reader.GetValue(index);
if (v == null || v == DBNull.Value)
return null;
return v.ToString();
}
public static long ConvertValueToInt64(this System.Data.IDataReader reader, int index, long defaultvalue = -1)
{
try
{
if (!reader.IsDBNull(index))
return reader.GetInt64(index);
}
catch
{
}
return -1;
}
public static System.Data.IDbCommand CreateCommand(this System.Data.IDbConnection self, System.Data.IDbTransaction transaction)
{
var con = self.CreateCommand();
con.Transaction = transaction;
return con;
}
/// <summary> Small helper method querying and returning a textual representation of the SQLite execution plan. </summary>
public static string GetSQLiteExecutionPlan(this System.Data.IDbCommand cmd)
{
using (var qpCmd = cmd.Connection.CreateCommand())
{
qpCmd.CommandText = "EXPLAIN QUERY PLAN " + cmd.CommandText;
qpCmd.Connection = cmd.Connection;
qpCmd.CommandType = cmd.CommandType;
qpCmd.Transaction = cmd.Transaction;
foreach (System.Data.IDataParameter p in cmd.Parameters)
qpCmd.AddParameter(p.Value, p.ParameterName);
System.Data.DataTable dt = new System.Data.DataTable();
using (var rd = qpCmd.ExecuteReader())
dt.Load(rd);
string plan =
String.Join("\t", dt.Columns.Cast<System.Data.DataColumn>().Select(c => c.ColumnName).ToArray()) + "\n"
+ string.Join("\n", dt.Rows.Cast<System.Data.DataRow>().Select(r => String.Join("\t", r.ItemArray.Select(o => o == null ? "" : o.ToString()).ToArray())).ToArray());
return plan;
}
}
public static void DumpSQL(this System.Data.IDbConnection self, System.Data.IDbTransaction trans, string sql, params object[] parameters)
{
using (var c = self.CreateCommand())
{
c.CommandText = sql;
c.Transaction = trans;
if (parameters != null)
foreach (var p in parameters)
c.AddParameter(p);
using (var rd = c.ExecuteReader())
{
for (int i = 0; i < rd.FieldCount; i++)
Console.Write((i == 0 ? "" : "\t") + rd.GetName(i));
Console.WriteLine();
long n = 0;
while (rd.Read())
{
for (int i = 0; i < rd.FieldCount; i++)
Console.Write(string.Format((i == 0 ? "{0}" : "\t{0}"), rd.GetValue(i)));
Console.WriteLine();
n++;
}
Console.WriteLine(LC.L("{0} records", n));
}
}
}
}
}
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