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AdoAdapterGetter.cs
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126 lines (106 loc) · 5.37 KB
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using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Data;
using System.Data.Common;
using System.Dynamic;
using System.Linq;
namespace Simple.Data.Ado
{
class AdoAdapterGetter
{
private readonly ConcurrentDictionary<string, ConcurrentDictionary<string, CommandTemplate>> _commandCaches =
new ConcurrentDictionary<string, ConcurrentDictionary<string, CommandTemplate>>();
private readonly AdoAdapter _adapter;
private readonly IDbTransaction _transaction;
private readonly IDbConnection _connection;
public AdoAdapterGetter(AdoAdapter adapter) : this(adapter, null)
{
}
public AdoAdapterGetter(AdoAdapter adapter, IDbTransaction transaction)
{
if (adapter == null) throw new ArgumentNullException("adapter");
_adapter = adapter;
if (transaction != null)
{
_transaction = transaction;
_connection = transaction.Connection;
}
}
public Func<object[],IDictionary<string,object>> CreateGetDelegate(string tableName, params object[] keyValues)
{
var primaryKey = _adapter.GetSchema().FindTable(tableName).PrimaryKey;
if (primaryKey == null) throw new InvalidOperationException("Table has no primary key.");
if (primaryKey.Length != keyValues.Length) throw new ArgumentException("Incorrect number of values for key.");
var commandBuilder = new GetHelper(_adapter.GetSchema()).GetCommand(_adapter.GetSchema().FindTable(tableName), keyValues);
var command = commandBuilder.GetCommand(_adapter.CreateConnection(), _adapter.AdoOptions);
command = _adapter.CommandOptimizer.OptimizeFindOne(command);
var commandTemplate =
commandBuilder.GetCommandTemplate(
_adapter.GetSchema().FindTable(_adapter.GetSchema().BuildObjectName(tableName)));
var cloneable = command as ICloneable;
if (cloneable != null)
{
return args => ExecuteSingletonQuery((IDbCommand)cloneable.Clone(), args, commandTemplate.Index);
}
return args => ExecuteSingletonQuery(commandTemplate, args);
}
private IDictionary<string, object> ExecuteSingletonQuery(IDbCommand command, object[] parameterValues, IDictionary<string,int> index)
{
for (int i = 0; i < command.Parameters.Count; i++)
{
((IDbDataParameter) command.Parameters[i]).Value = FixObjectType(parameterValues[i]);
}
command.Connection = _connection ?? _adapter.CreateConnection();
command.Transaction = _transaction;
return TryExecuteSingletonQuery(command.Connection, command, index);
}
private IDictionary<string, object> ExecuteSingletonQuery(CommandTemplate commandTemplate, IEnumerable<object> parameterValues)
{
var connection = _connection ?? _adapter.CreateConnection();
var command = commandTemplate.GetDbCommand(_adapter, connection, parameterValues);
command.Transaction = _transaction;
return TryExecuteSingletonQuery(connection, command, commandTemplate.Index);
}
private static IDictionary<string, object> TryExecuteSingletonQuery(IDbConnection connection, IDbCommand command, IDictionary<string, int> index)
{
using (connection.MaybeDisposable())
using (command)
{
connection.OpenIfClosed();
using (var reader = command.TryExecuteReader())
{
if (reader.Read())
{
return reader.ToDictionary(index);
}
}
}
return null;
}
private static object FixObjectType(object value)
{
if (value == null) return DBNull.Value;
if (TypeHelper.IsKnownType(value.GetType())) return value;
var dynamicObject = value as DynamicObject;
if (dynamicObject != null)
{
return dynamicObject.ToString();
}
return value;
}
public IDictionary<string, object> Get(string tableName, object[] parameterValues)
{
var primaryKey = _adapter.GetSchema().FindTable(tableName).PrimaryKey;
if (primaryKey == null) throw new InvalidOperationException("Table has no primary key.");
if (primaryKey.Length != parameterValues.Length) throw new ArgumentException("Incorrect number of values for key.");
var commandBuilder = new GetHelper(_adapter.GetSchema()).GetCommand(_adapter.GetSchema().FindTable(tableName), parameterValues);
var command = commandBuilder.GetCommand(_adapter.CreateConnection(), _adapter.AdoOptions);
command = _adapter.CommandOptimizer.OptimizeFindOne(command);
var commandTemplate =
commandBuilder.GetCommandTemplate(
_adapter.GetSchema().FindTable(_adapter.GetSchema().BuildObjectName(tableName)));
return ExecuteSingletonQuery(command, parameterValues, commandTemplate.Index);
}
}
}