using System;
using System.Collections.Generic;
using System.Data;
using System.Data.Common;
using System.Data.Common.CommandTrees;
using System.Data.Entity;
using System.Data.EntityClient;
using System.Data.Metadata.Edm;
using System.Data.Objects.DataClasses;
using System.Data.SqlClient;
using System.Linq;
using System.Linq.Dynamic;
using System.Linq.Expressions;
using System.Reflection;
using System.Text;
using System.Data.Objects;
using EntityFramework.Mapping;
using EntityFramework.Reflection;
namespace EntityFramework.Extensions
{
/// <summary>
/// An extensions class for batch queries.
/// </summary>
public static class BatchExtensions
{
/// <summary>
/// Executes a delete statement using the query to filter the rows to be deleted.
/// </summary>
/// <typeparam name="TEntity">The type of the entity.</typeparam>
/// <param name="source">The source used to determine the table to delete from.</param>
/// <param name="query">The IQueryable used to generate the where clause for the delete statement.</param>
/// <returns>The number of row deleted.</returns>
/// <remarks>
/// When executing this method, the statement is immediately executed on the database provider
/// and is not part of the change tracking system. Also, changes will not be reflected on
/// any entities that have already been materialized in the current context.
/// </remarks>
public static int Delete<TEntity>(
this ObjectSet<TEntity> source,
IQueryable<TEntity> query)
where TEntity : class
{
if (source == null)
throw new ArgumentNullException("source");
if (query == null)
throw new ArgumentNullException("query");
ObjectContext objectContext = source.Context;
if (objectContext == null)
throw new ArgumentException("The ObjectContext for the source query can not be null.", "source");
EntityMap entityMap = source.GetEntityMap<TEntity>();
if (entityMap == null)
throw new ArgumentException("Could not load the entity mapping information for the source ObjectSet.", "source");
ObjectQuery<TEntity> objectQuery = query.ToObjectQuery();
if (objectQuery == null)
throw new ArgumentException("The query must be of type ObjectQuery or DbQuery.", "query");
return Delete(objectContext, entityMap, objectQuery);
}
/// <summary>
/// Executes a delete statement using an expression to filter the rows to be deleted.
/// </summary>
/// <typeparam name="TEntity">The type of the entity.</typeparam>
/// <param name="source">The source used to determine the table to delete from.</param>
/// <param name="filterExpression">The filter expression used to generate the where clause for the delete statement.</param>
/// <returns>The number of row deleted.</returns>
/// <example>Delete all users with email domain @test.com.
/// <code><![CDATA[
/// var db = new TrackerEntities();
/// string emailDomain = "@test.com";
/// int count = db.Users.Delete(u => u.Email.EndsWith(emailDomain));
/// ]]></code>
/// </example>
/// <remarks>
/// When executing this method, the statement is immediately executed on the database provider
/// and is not part of the change tracking system. Also, changes will not be reflected on
/// any entities that have already been materialized in the current context.
/// </remarks>
public static int Delete<TEntity>(
this ObjectSet<TEntity> source,
Expression<Func<TEntity, bool>> filterExpression)
where TEntity : class
{
if (source == null)
throw new ArgumentNullException("source");
if (filterExpression == null)
throw new ArgumentNullException("filterExpression");
return source.Delete(source.Where(filterExpression));
}
/// <summary>
/// Executes a delete statement using the query to filter the rows to be deleted.
/// </summary>
/// <typeparam name="TEntity">The type of the entity.</typeparam>
/// <param name="source">The source used to determine the table to delete from.</param>
/// <param name="query">The IQueryable used to generate the where clause for the delete statement.</param>
/// <returns>The number of row deleted.</returns>
/// <remarks>
/// When executing this method, the statement is immediately executed on the database provider
/// and is not part of the change tracking system. Also, changes will not be reflected on
/// any entities that have already been materialized in the current context.
/// </remarks>
public static int Delete<TEntity>(
this DbSet<TEntity> source,
IQueryable<TEntity> query)
where TEntity : class
{
if (source == null)
throw new ArgumentNullException("source");
if (query == null)
throw new ArgumentNullException("query");
ObjectQuery<TEntity> sourceQuery = source.ToObjectQuery();
if (sourceQuery == null)
throw new ArgumentException("The query must be of type ObjectQuery or DbQuery.", "source");
ObjectContext objectContext = sourceQuery.Context;
if (objectContext == null)
throw new ArgumentException("The ObjectContext for the source query can not be null.", "source");
EntityMap entityMap = sourceQuery.GetEntityMap<TEntity>();
if (entityMap == null)
throw new ArgumentException("Could not load the entity mapping information for the source ObjectSet.", "source");
ObjectQuery<TEntity> objectQuery = query.ToObjectQuery();
if (objectQuery == null)
throw new ArgumentException("The query must be of type ObjectQuery or DbQuery.", "query");
return Delete(objectContext, entityMap, objectQuery);
}
/// <summary>
/// Executes a delete statement using an expression to filter the rows to be deleted.
/// </summary>
/// <typeparam name="TEntity">The type of the entity.</typeparam>
/// <param name="source">The source used to determine the table to delete from.</param>
/// <param name="filterExpression">The filter expression used to generate the where clause for the delete statement.</param>
/// <returns>The number of row deleted.</returns>
/// <example>Delete all users with email domain @test.com.
/// <code><![CDATA[
/// var db = new TrackerContext();
/// string emailDomain = "@test.com";
/// int count = db.Users.Delete(u => u.Email.EndsWith(emailDomain));
/// ]]></code>
/// </example>
/// <remarks>
/// When executing this method, the statement is immediately executed on the database provider
/// and is not part of the change tracking system. Also, changes will not be reflected on
/// any entities that have already been materialized in the current context.
/// </remarks>
public static int Delete<TEntity>(
this DbSet<TEntity> source,
Expression<Func<TEntity, bool>> filterExpression)
where TEntity : class
{
if (source == null)
throw new ArgumentNullException("source");
if (filterExpression == null)
throw new ArgumentNullException("filterExpression");
return source.Delete(source.Where(filterExpression));
}
/// <summary>
/// Executes an update statement using the query to filter the rows to be updated.
/// </summary>
/// <typeparam name="TEntity">The type of the entity.</typeparam>
/// <param name="source">The source used to determine the table to update.</param>
/// <param name="query">The query used to generate the where clause.</param>
/// <param name="updateExpression">The MemberInitExpression used to indicate what is updated.</param>
/// <returns>The number of row updated.</returns>
/// <remarks>
/// When executing this method, the statement is immediately executed on the database provider
/// and is not part of the change tracking system. Also, changes will not be reflected on
/// any entities that have already been materialized in the current context.
/// </remarks>
public static int Update<TEntity>(
this ObjectSet<TEntity> source,
IQueryable<TEntity> query,
Expression<Func<TEntity, TEntity>> updateExpression)
where TEntity : class
{
if (source == null)
throw new ArgumentNullException("source");
if (query == null)
throw new ArgumentNullException("query");
if (updateExpression == null)
throw new ArgumentNullException("updateExpression");
ObjectContext objectContext = source.Context;
if (objectContext == null)
throw new ArgumentException("The ObjectContext for the source query can not be null.", "source");
EntityMap entityMap = source.GetEntityMap<TEntity>();
if (entityMap == null)
throw new ArgumentException("Could not load the entity mapping information for the source ObjectSet.", "source");
ObjectQuery<TEntity> objectQuery = query.ToObjectQuery();
if (objectQuery == null)
throw new ArgumentException("The query must be of type ObjectQuery or DbQuery.", "query");
return Update(objectContext, entityMap, objectQuery, updateExpression);
}
/// <summary>
/// Executes an update statement using an expression to filter the rows that are updated.
/// </summary>
/// <typeparam name="TEntity">The type of the entity.</typeparam>
/// <param name="source">The source used to determine the table to update.</param>
/// <param name="filterExpression">The filter expression used to generate the where clause.</param>
/// <param name="updateExpression">The MemberInitExpression used to indicate what is updated.</param>
/// <returns>The number of row updated.</returns>
/// <example>Update all users in the test.com domain to be inactive.
/// <code><![CDATA[
/// var db = new TrackerEntities();
/// string emailDomain = "@test.com";
/// int count = db.Users.Update(
/// u => u.Email.EndsWith(emailDomain),
/// u => new User { IsApproved = false, LastActivityDate = DateTime.Now });
/// ]]></code>
/// </example>
/// <remarks>
/// When executing this method, the statement is immediately executed on the database provider
/// and is not part of the change tracking system. Also, changes will not be reflected on
/// any entities that have already been materialized in the current context.
/// </remarks>
public static int Update<TEntity>(
this ObjectSet<TEntity> source,
Expression<Func<TEntity, bool>> filterExpression,
Expression<Func<TEntity, TEntity>> updateExpression)
where TEntity : class
{
if (source == null)
throw new ArgumentNullException("source");
if (filterExpression == null)
throw new ArgumentNullException("filterExpression");
return source.Update(source.Where(filterExpression), updateExpression);
}
/// <summary>
/// Executes an update statement using the query to filter the rows to be updated.
/// </summary>
/// <typeparam name="TEntity">The type of the entity.</typeparam>
/// <param name="source">The source used to determine the table to update.</param>
/// <param name="query">The query used to generate the where clause.</param>
/// <param name="updateExpression">The MemberInitExpression used to indicate what is updated.</param>
/// <returns>The number of row updated.</returns>
/// <remarks>
/// When executing this method, the statement is immediately executed on the database provider
/// and is not part of the change tracking system. Also, changes will not be reflected on
/// any entities that have already been materialized in the current context.
/// </remarks>
public static int Update<TEntity>(
this DbSet<TEntity> source,
IQueryable<TEntity> query,
Expression<Func<TEntity, TEntity>> updateExpression)
where TEntity : class
{
if (source == null)
throw new ArgumentNullException("source");
if (query == null)
throw new ArgumentNullException("query");
if (updateExpression == null)
throw new ArgumentNullException("updateExpression");
ObjectQuery<TEntity> sourceQuery = source.ToObjectQuery();
if (sourceQuery == null)
throw new ArgumentException("The query must be of type ObjectQuery or DbQuery.", "source");
ObjectContext objectContext = sourceQuery.Context;
if (objectContext == null)
throw new ArgumentException("The ObjectContext for the source query can not be null.", "source");
EntityMap entityMap = sourceQuery.GetEntityMap<TEntity>();
if (entityMap == null)
throw new ArgumentException("Could not load the entity mapping information for the source.", "source");
ObjectQuery<TEntity> objectQuery = query.ToObjectQuery();
if (objectQuery == null)
throw new ArgumentException("The query must be of type ObjectQuery or DbQuery.", "query");
return Update(objectContext, entityMap, objectQuery, updateExpression);
}
/// <summary>
/// Executes an update statement using an expression to filter the rows that are updated.
/// </summary>
/// <typeparam name="TEntity">The type of the entity.</typeparam>
/// <param name="source">The source used to determine the table to update.</param>
/// <param name="filterExpression">The filter expression used to generate the where clause.</param>
/// <param name="updateExpression">The MemberInitExpression used to indicate what is updated.</param>
/// <returns>The number of row updated.</returns>
/// <example>Update all users in the test.com domain to be inactive.
/// <code><![CDATA[
/// var db = new TrackerContext();
/// string emailDomain = "@test.com";
/// int count = db.Users.Update(
/// u => u.Email.EndsWith(emailDomain),
/// u => new User { IsApproved = false, LastActivityDate = DateTime.Now });
/// ]]></code>
/// </example>
/// <remarks>
/// When executing this method, the statement is immediately executed on the database provider
/// and is not part of the change tracking system. Also, changes will not be reflected on
/// any entities that have already been materialized in the current context.
/// </remarks>
public static int Update<TEntity>(
this DbSet<TEntity> source,
Expression<Func<TEntity, bool>> filterExpression,
Expression<Func<TEntity, TEntity>> updateExpression)
where TEntity : class
{
if (source == null)
throw new ArgumentNullException("source");
if (filterExpression == null)
throw new ArgumentNullException("filterExpression");
return source.Update(source.Where(filterExpression), updateExpression);
}
private static int Delete<TEntity>(ObjectContext objectContext, EntityMap entityMap, ObjectQuery<TEntity> query)
where TEntity : class
{
DbConnection deleteConnection = null;
DbTransaction deleteTransaction = null;
DbCommand deleteCommand = null;
bool ownConnection = false;
bool ownTransaction = false;
try
{
var store = GetStore(objectContext);
deleteConnection = store.Item1;
deleteTransaction = store.Item2;
if (deleteConnection.State != ConnectionState.Open)
{
deleteConnection.Open();
ownConnection = true;
}
if (deleteTransaction == null)
{
deleteTransaction = deleteConnection.BeginTransaction();
ownTransaction = true;
}
deleteCommand = deleteConnection.CreateCommand();
deleteCommand.Transaction = deleteTransaction;
if (objectContext.CommandTimeout.HasValue)
deleteCommand.CommandTimeout = objectContext.CommandTimeout.Value;
var innerSelect = GetSelectSql(query, entityMap, deleteCommand);
var sqlBuilder = new StringBuilder(innerSelect.Length * 2);
sqlBuilder.Append("DELETE ");
sqlBuilder.Append(entityMap.TableName);
sqlBuilder.AppendLine();
sqlBuilder.AppendFormat("FROM {0} AS j0 INNER JOIN (", entityMap.TableName);
sqlBuilder.AppendLine();
sqlBuilder.AppendLine(innerSelect);
sqlBuilder.Append(") AS j1 ON (");
bool wroteKey = false;
foreach (var keyMap in entityMap.KeyMaps)
{
if (wroteKey)
sqlBuilder.Append(" AND ");
sqlBuilder.AppendFormat("j0.{0} = j1.{0}", keyMap.ColumnName);
wroteKey = true;
}
sqlBuilder.Append(")");
deleteCommand.CommandText = sqlBuilder.ToString();
int result = deleteCommand.ExecuteNonQuery();
if (ownTransaction)
deleteTransaction.Commit();
return result;
}
finally
{
if (deleteCommand != null)
deleteCommand.Dispose();
if (deleteTransaction != null && ownTransaction)
deleteTransaction.Dispose();
if (deleteConnection != null && ownConnection)
deleteConnection.Close();
}
}
private static int Update<TEntity>(ObjectContext objectContext, EntityMap entityMap, ObjectQuery<TEntity> query, Expression<Func<TEntity, TEntity>> updateExpression)
where TEntity : class
{
DbConnection updateConnection = null;
DbTransaction updateTransaction = null;
DbCommand updateCommand = null;
bool ownConnection = false;
bool ownTransaction = false;
try
{
var store = GetStore(objectContext);
updateConnection = store.Item1;
updateTransaction = store.Item2;
if (updateConnection.State != ConnectionState.Open)
{
updateConnection.Open();
ownConnection = true;
}
if (updateTransaction == null)
{
updateTransaction = updateConnection.BeginTransaction();
ownTransaction = true;
}
updateCommand = updateConnection.CreateCommand();
updateCommand.Transaction = updateTransaction;
if (objectContext.CommandTimeout.HasValue)
updateCommand.CommandTimeout = objectContext.CommandTimeout.Value;
var innerSelect = GetSelectSql(query, entityMap, updateCommand);
var sqlBuilder = new StringBuilder(innerSelect.Length * 2);
sqlBuilder.Append("UPDATE ");
sqlBuilder.Append(entityMap.TableName);
sqlBuilder.AppendLine(" SET ");
var memberInitExpression = updateExpression.Body as MemberInitExpression;
if (memberInitExpression == null)
throw new ArgumentException("The update expression must be of type MemberInitExpression.", "updateExpression");
int nameCount = 0;
bool wroteSet = false;
foreach (MemberBinding binding in memberInitExpression.Bindings)
{
if (wroteSet)
sqlBuilder.AppendLine(", ");
string propertyName = binding.Member.Name;
string columnName = entityMap.PropertyMaps
.Where(p => p.PropertyName == propertyName)
.Select(p => p.ColumnName)
.FirstOrDefault();
string parameterName = "p__update__" + nameCount++;
var memberAssignment = binding as MemberAssignment;
if (memberAssignment == null)
throw new ArgumentException("The update expression MemberBinding must only by type MemberAssignment.", "updateExpression");
object value;
if (memberAssignment.Expression.NodeType == ExpressionType.Constant)
{
var constantExpression = memberAssignment.Expression as ConstantExpression;
if (constantExpression == null)
throw new ArgumentException("The MemberAssignment expression is not a ConstantExpression.", "updateExpression");
value = constantExpression.Value;
}
else
{
LambdaExpression lambda = Expression.Lambda(memberAssignment.Expression, null);
value = lambda.Compile().DynamicInvoke();
}
var parameter = updateCommand.CreateParameter();
parameter.ParameterName = parameterName;
parameter.Value = value;
updateCommand.Parameters.Add(parameter);
sqlBuilder.AppendFormat("{0} = @{1}", columnName, parameterName);
wroteSet = true;
}
sqlBuilder.AppendLine(" ");
sqlBuilder.AppendFormat("FROM {0} AS j0 INNER JOIN (", entityMap.TableName);
sqlBuilder.AppendLine();
sqlBuilder.AppendLine(innerSelect);
sqlBuilder.Append(") AS j1 ON (");
bool wroteKey = false;
foreach (var keyMap in entityMap.KeyMaps)
{
if (wroteKey)
sqlBuilder.Append(" AND ");
sqlBuilder.AppendFormat("j0.{0} = j1.{0}", keyMap.ColumnName);
wroteKey = true;
}
sqlBuilder.Append(")");
updateCommand.CommandText = sqlBuilder.ToString();
int result = updateCommand.ExecuteNonQuery();
if (ownTransaction)
updateTransaction.Commit();
return result;
}
finally
{
if (updateCommand != null)
updateCommand.Dispose();
if (updateTransaction != null && ownTransaction)
updateTransaction.Dispose();
if (updateConnection != null && ownConnection)
updateConnection.Close();
}
}
private static Tuple<DbConnection, DbTransaction> GetStore(ObjectContext objectContext)
{
DbConnection dbConnection = objectContext.Connection;
var entityConnection = dbConnection as EntityConnection;
if (entityConnection == null)
return new Tuple<DbConnection, DbTransaction>(dbConnection, null);
DbConnection connection = entityConnection.StoreConnection;
dynamic connectionProxy = new DynamicProxy(entityConnection);
dynamic entityTransaction = connectionProxy.CurrentTransaction;
if (entityTransaction == null)
return new Tuple<DbConnection, DbTransaction>(connection, null);
DbTransaction transaction = entityTransaction.StoreTransaction;
return new Tuple<DbConnection, DbTransaction>(connection, transaction);
}
private static string GetSelectSql<TEntity>(ObjectQuery<TEntity> query, EntityMap entityMap, DbCommand command)
where TEntity : class
{
var selector = new StringBuilder(50);
selector.Append("new(");
foreach (var propertyMap in entityMap.KeyMaps)
{
if (selector.Length > 4)
selector.Append((", "));
selector.Append(propertyMap.PropertyName);
}
selector.Append(")");
var selectQuery = DynamicQueryable.Select(query, selector.ToString());
var objectQuery = selectQuery as ObjectQuery;
if (objectQuery == null)
throw new ArgumentException("The query must be of type ObjectQuery.", "query");
string innerJoinSql = objectQuery.ToTraceString();
foreach (var objectParameter in objectQuery.Parameters)
{
var parameter = command.CreateParameter();
parameter.ParameterName = objectParameter.Name;
parameter.Value = objectParameter.Value;
command.Parameters.Add(parameter);
}
return innerJoinSql;
}
}
}
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