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BulkInserterHelper.cs
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using Simple.Data.Extensions;
namespace Simple.Data.Ado
{
using System;
using System.Collections.Generic;
using System.Data;
using System.Diagnostics;
using System.Linq;
using Schema;
class BulkInserterHelper
{
protected readonly AdoAdapter Adapter;
protected readonly IEnumerable<IDictionary<string, object>> Data;
private readonly Table _table;
private readonly List<Column> _columns;
private Action<IDictionary<string, object>, IDbCommand> _parameterSetter;
public BulkInserterHelper(AdoAdapter adapter, IEnumerable<IDictionary<string, object>> data, Table table, List<Column> columns)
{
Adapter = adapter;
Data = data;
_table = table;
_columns = columns;
}
public virtual void InsertRowsWithoutFetchBack(string insertSql, Func<IDictionary<string, object>, Exception, bool> onError)
{
var connection = Adapter.CreateConnection();
using (connection.MaybeDisposable())
{
using (var insertCommand = new CommandHelper(Adapter).CreateInsert(connection, insertSql, _columns))
{
connection.OpenIfClosed();
TryPrepare(insertCommand);
foreach (var row in Data)
{
InsertRow(row, insertCommand, onError);
}
}
}
}
public virtual IEnumerable<IDictionary<string, object>> InsertRowsWithSeparateStatements(string insertSql, string selectSql, Func<IDictionary<string, object>, Exception, bool> onError)
{
var connection = Adapter.CreateConnection();
using (connection.MaybeDisposable())
{
using (var insertCommand = new CommandHelper(Adapter).CreateInsert(connection, insertSql, _columns))
using (var selectCommand = connection.CreateCommand(Adapter.AdoOptions))
{
selectCommand.CommandText = selectSql;
connection.OpenIfClosed();
TryPrepare(insertCommand, selectCommand);
return Data.Select(row => InsertRow(row, insertCommand, selectCommand, onError)).Where(r => r != null).ToList();
}
}
}
public virtual IEnumerable<IDictionary<string, object>> InsertRowsWithCompoundStatement(string insertSql, string selectSql, Func<IDictionary<string, object>, Exception, bool> onError)
{
insertSql += "; " + selectSql;
var connection = Adapter.CreateConnection();
using (connection.MaybeDisposable())
{
using (var command = new CommandHelper(Adapter).CreateInsert(connection, insertSql, _columns))
{
connection.OpenIfClosed();
TryPrepare(command);
return Data.Select(row => InsertRowAndSelect(row, command, onError)).Where(r => r != null).ToList();
}
}
}
protected IDictionary<string, object> InsertRowAndSelect(IDictionary<string, object> row, IDbCommand command, Func<IDictionary<string,object>, Exception, bool> onError)
{
if (_parameterSetter == null) _parameterSetter = BuildParameterSettingAction(row);
_parameterSetter(row, command);
try
{
var insertedRow = TryExecuteSingletonQuery(command);
return insertedRow;
}
catch (Exception ex)
{
if (onError(row, ex)) return null;
throw;
}
}
protected int InsertRow(IDictionary<string, object> row, IDbCommand command, Func<IDictionary<string, object>, Exception, bool> onError)
{
if (_parameterSetter == null) _parameterSetter = BuildParameterSettingAction(row);
_parameterSetter(row, command);
try
{
return command.TryExecuteNonQuery();
}
catch (Exception ex)
{
if (onError(row, ex)) return 0;
throw;
}
}
protected IDictionary<string, object> InsertRow(IDictionary<string, object> row, IDbCommand insertCommand, IDbCommand selectCommand, Func<IDictionary<string, object>, Exception, bool> onError)
{
if (_parameterSetter == null) _parameterSetter = BuildParameterSettingAction(row);
_parameterSetter(row, insertCommand);
try
{
if (insertCommand.TryExecuteNonQuery() == 1)
return TryExecuteSingletonQuery(selectCommand);
}
catch (Exception ex)
{
if (onError(row, ex)) return null;
throw;
}
return null;
}
private static IDictionary<string, object> TryExecuteSingletonQuery(IDbCommand command)
{
using (var reader = command.TryExecuteReader())
{
if (reader.Read())
{
return reader.ToDictionary();
}
}
return null;
}
private static void TryPrepare(params IDbCommand[] commands)
{
foreach (var command in commands)
{
try
{
command.Prepare();
}
catch (InvalidOperationException e)
{
SimpleDataTraceSources.TraceSource.TraceEvent(TraceEventType.Warning, SimpleDataTraceSources.GenericWarningMessageId,
"Could not prepare command: {0}", e.Message);
}
}
}
private Action<IDictionary<string,object>, IDbCommand> BuildParameterSettingAction(IDictionary<string,object> sample)
{
var actions =
_columns.Select<Column, Action<IDictionary<string,object>, IDbCommand>>((c, i) => (row, cmd) => cmd.SetParameterValue(i, null)).ToArray();
var usedColumnNames = sample.Keys.Where(k => _columns.Any(c => String.Equals(c.HomogenizedName, k.Homogenize(), StringComparison.InvariantCultureIgnoreCase))).ToArray();
foreach (var columnName in usedColumnNames)
{
int index = _columns.IndexOf(_table.FindColumn(columnName));
if (index >= 0)
actions[index] = BuildIndividualFunction(columnName, index);
++index;
}
return actions.Aggregate((working, next) => working + next) ?? ((row,cmd) => { });
}
private Action<IDictionary<string, object>, IDbCommand> BuildIndividualFunction(string key, int index)
{
return (dict, command) => command.SetParameterValue(index, dict[key]);
}
}
}