public IDbStatement Create(Mapping.Reference reference, ValuedParameter idParameter)
{
//Case of single rule and FK is in the child table
if (reference.Model.Cardinality.IsOne && reference.Model.Cardinality is Cardinality.ToMany)
{
Mapping.Rule rule = reference.Rules[0];
TableAlias alias = null;
UpdateStatement update = new UpdateStatement() { From = new Evaluant.Uss.SqlExpressions.FromClause(new TableSourceExpression(alias, rule.ChildTable)) };
foreach (Field field in rule.ChildFields)
update.Set.Add(new ColumnExpression(alias, field.ColumnName), new Evaluant.Uss.SqlExpressions.DbParameter(field.ColumnName.Text, field.DbType, System.Data.ParameterDirection.Input));
BinaryExpression constraint = null;
foreach (Mapping.Attribute attribute in reference.Target.Ids.Values)
{
Field field = attribute.Field;
BinaryExpression fieldConstraint = new BinaryExpression(BinaryExpressionType.Equal, new ColumnExpression(alias, field.ColumnName), new SqlExpressions.DbParameter(field.ColumnName.Text, field.DbType, System.Data.ParameterDirection.Input));
if (constraint == null)
constraint = fieldConstraint;
else
constraint = new BinaryExpression(BinaryExpressionType.And, constraint, fieldConstraint);
}
update.Where = new WhereClause(constraint);
return update;
}
//Case of single rule and FK is in the parent table
if (reference.Model.Cardinality.IsMany && reference.Model.Cardinality is Cardinality.ToOne)
{
Mapping.Rule rule = reference.Rules[0];
TableAlias alias = null;
UpdateStatement update = new UpdateStatement() { From = new Evaluant.Uss.SqlExpressions.FromClause(new TableSourceExpression(alias, rule.ParentTable)) };
foreach (Field field in rule.ParentFields)
update.Set.Add(new ColumnExpression(alias, field.ColumnName), new Evaluant.Uss.SqlExpressions.DbParameter(field.ColumnName.Text, field.DbType, System.Data.ParameterDirection.Input));
BinaryExpression constraint = null;
foreach (Mapping.Attribute attribute in reference.Parent.Ids.Values)
{
Field field = attribute.Field;
BinaryExpression fieldConstraint = new BinaryExpression(BinaryExpressionType.Equal, new ColumnExpression(alias, field.ColumnName), new SqlExpressions.DbParameter(field.ColumnName.Text, field.DbType, System.Data.ParameterDirection.Input));
if (constraint == null)
constraint = fieldConstraint;
else
constraint = new BinaryExpression(BinaryExpressionType.And, constraint, fieldConstraint);
}
update.Where = new WhereClause(constraint);
return update;
}
//Case of 2 rules with an index table
if (reference.Model.Cardinality.IsMany && reference.Model.Cardinality is Cardinality.ToMany)
{
TableAlias alias = null;
Table indexTable = reference.Rules[0].ChildTable;
Dictionary<ColumnExpression, Expression> values = new Dictionary<ColumnExpression, Expression>();
InsertStatement insert = new InsertStatement(new TableSourceExpression(alias, indexTable), values);
foreach (Mapping.Rule rule in reference.Rules)
{
if (rule.ParentTable == indexTable)
{
foreach (Field field in rule.ParentFields)
values.Add(new ColumnExpression(alias, field.ColumnName), new SqlExpressions.DbParameter(field.ColumnName.Text, field.DbType, System.Data.ParameterDirection.Input));
}
if (rule.ChildTable == indexTable)
{
foreach (Field field in rule.ChildFields)
{
if (field.IsIdentity)
values.Add(new ColumnExpression(alias, field.ColumnName), new LazyParameter(field.ColumnName.Text, idParameter, System.Data.ParameterDirection.Input));
else
values.Add(new ColumnExpression(alias, field.ColumnName), new SqlExpressions.DbParameter(field.ColumnName.Text, field.DbType, System.Data.ParameterDirection.Input));
}
}
}
return insert;
}
throw new NotImplementedException();
}
public LazyParameter(ValuedParameter innerParameter)
: base(innerParameter.Name, null)
{
this.innerParameter = innerParameter;
}
public LazyParameter(ValuedParameter idParameter, ParameterDirection parameterDirection)
: base(idParameter.Name, null, idParameter.Type, parameterDirection)
{
this.innerParameter = idParameter;
}
/// <summary>
/// Creates the parameter.
/// </summary>
/// <remarks>
/// The parameter will be null if the command already contains a parameter for this field.
/// </remarks>
/// <param name="command">The command.</param>
/// <param name="field">The field.</param>
/// <returns></returns>
private ValuedParameter CreateParameter(IDbStatement command, Field field)
{
if (command.Parameters.ContainsKey(field.ColumnName.Text))
return null;
ValuedParameter param = new ValuedParameter(field.ColumnName.Text, null, field.DbType, ParameterDirection.Input);
param.Precision = field.Precision;
param.Scale = field.Scale;
param.Size = field.Size;
return param;
}
