protected virtual void VisitDeleteCommandTree(DbDeleteCommandTree deleteTree)
{
//Contract.Requires(deleteTree != null);
VisitExpressionBindingPre(deleteTree.Target);
VisitExpression(deleteTree.Predicate);
VisitExpressionBindingPost(deleteTree.Target);
}
protected virtual void VisitDeleteCommandTree(DbDeleteCommandTree deleteTree)
{
EntityUtil.CheckArgumentNull(deleteTree, "deleteTree");
this.VisitExpressionBindingPre(deleteTree.Target);
this.VisitExpression(deleteTree.Predicate);
this.VisitExpressionBindingPost(deleteTree.Target);
}
protected virtual void VisitDeleteCommandTree(DbDeleteCommandTree deleteTree)
{
EntityUtil.CheckArgumentNull(deleteTree, "deleteTree");
this.VisitExpressionBindingPre(deleteTree.Target);
this.VisitExpression(deleteTree.Predicate);
this.VisitExpressionBindingPost(deleteTree.Target);
}
internal static string GenerateDeleteSql(DbDeleteCommandTree tree, out List<DbParameter> parameters)
{
StringBuilder commandText = new StringBuilder(CommandTextBuilderInitialCapacity);
ExpressionTranslator translator = new ExpressionTranslator(commandText, tree, false);
commandText.Append("DELETE FROM ");
tree.Target.Expression.Accept(translator);
commandText.AppendLine();
// where c1 = ... AND c2 = ...
commandText.Append("WHERE ");
tree.Predicate.Accept(translator);
parameters = translator.Parameters;
return commandText.ToString();
}
/// <summary>
/// Builds a delete command.
/// </summary>
/// <param name="oldRow">Value of the row being deleted.</param>
/// <param name="processor">Context for the table containing row.</param>
/// <returns>Delete command.</returns>
internal UpdateCommand BuildDeleteCommand(PropagatorResult oldRow, TableChangeProcessor processor)
{
// If we're deleting a row, the row must always be touched
bool rowMustBeTouched = true;
// Initialize DML command tree
DbExpressionBinding target = GetTarget(processor);
// Create delete predicate
DbExpression predicate = BuildPredicate(target, oldRow, null, processor, ref rowMustBeTouched);
DbDeleteCommandTree commandTree = new DbDeleteCommandTree(m_translator.MetadataWorkspace, DataSpace.SSpace, target, predicate);
// Set command
// Initialize delete command
UpdateCommand command = new DynamicUpdateCommand(processor, m_translator, ModificationOperator.Delete, oldRow, null, commandTree, null);
return command;
}
internal static string[] GenerateDeleteSql(DbDeleteCommandTree tree, out List<DbParameter> parameters, bool isLocalProvider)
{
var commandTexts = new List<String>();
var commandText = new StringBuilder(s_commandTextBuilderInitialCapacity);
var translator = new ExpressionTranslator(commandText, tree, false, isLocalProvider);
// delete [schemaName].[tableName]
commandText.Append("delete ");
tree.Target.Expression.Accept(translator);
commandText.AppendLine();
// where c1 = ... AND c2 = ...
commandText.Append("where ");
tree.Predicate.Accept(translator);
commandTexts.Add(commandText.ToString());
commandText.Length = 0;
parameters = translator.Parameters;
return commandTexts.ToArray();
}
public SqlDeleteGenerator(DbDeleteCommandTree commandTree)
{
_commandTree = commandTree;
}
internal static string GenerateDeleteSql(DbDeleteCommandTree tree, SqlVersion sqlVersion, out List<SqlParameter> parameters)
{
StringBuilder commandText = new StringBuilder(s_commandTextBuilderInitialCapacity);
ExpressionTranslator translator = new ExpressionTranslator(commandText, tree, false, sqlVersion);
// delete [schemaName].[tableName]
commandText.Append("delete ");
tree.Target.Expression.Accept(translator);
commandText.AppendLine();
// where c1 = ... AND c2 = ...
commandText.Append("where ");
tree.Predicate.Accept(translator);
parameters = translator.Parameters;
return commandText.ToString();
}
