/// <summary>
/// Render the where condition for a (batch) load by identifier / collection key
/// </summary>
/// <param name="factory"></param>
/// <param name="alias"></param>
/// <param name="columnNames"></param>
/// <param name="type"></param>
/// <param name="batchSize"></param>
/// <returns></returns>
protected static SqlStringBuilder WhereString(ISessionFactoryImplementor factory, string alias, string[] columnNames, IType type, int batchSize)
{
Parameter[] columnParameters = Parameter.GenerateParameters(factory, columnNames, type);
ConditionalFragment byId = new ConditionalFragment()
.SetTableAlias(alias)
.SetCondition(columnNames, columnParameters);
SqlStringBuilder whereString = new SqlStringBuilder();
if (batchSize == 1)
{
whereString.Add(byId.ToSqlStringFragment());
}
else
{
whereString.Add(StringHelper.OpenParen); // TODO: unnecessary for databases with ANSI-style joins
DisjunctionFragment df = new DisjunctionFragment();
for (int i = 0; i < batchSize; i++)
{
df.AddCondition(byId);
}
whereString.Add(df.ToFragmentString());
whereString.Add(StringHelper.ClosedParen); // TODO: unnecessary for databases with ANSI-style joins
}
return(whereString);
}
/// <summary>
/// Render the where condition for a (batch) load by identifier / collection key
/// </summary>
protected SqlStringBuilder WhereString(string alias, string[] columnNames, int batchSize)
{
if (columnNames.Length == 1)
{
// if not a composite key, use "foo in (?, ?, ?)" for batching
// if no batch, and not a composite key, use "foo = ?"
string tableAlias = GenerateAliasForColumn(alias, columnNames[0]);
InFragment inf = new InFragment().SetColumn(tableAlias, columnNames[0]);
for (int i = 0; i < batchSize; i++)
{
inf.AddValue(Parameter.Placeholder);
}
return(new SqlStringBuilder(inf.ToFragmentString()));
}
else
{
var fragments = new ConditionalFragment[batchSize];
for (int i = 0; i < batchSize; i++)
{
fragments[i] = new ConditionalFragment()
.SetTableAlias(alias)
.SetCondition(columnNames, Parameter.GenerateParameters(columnNames.Length));
}
var whereString = new SqlStringBuilder();
if (fragments.Length == 1)
{
// if no batch, use "foo = ? and bar = ?"
whereString.Add(fragments[0].ToSqlStringFragment());
}
else
{
// if batching, use "( (foo = ? and bar = ?) or (foo = ? and bar = ?) )"
var df = new DisjunctionFragment(fragments);
whereString.Add(StringHelper.OpenParen);
whereString.Add(df.ToFragmentString());
whereString.Add(StringHelper.ClosedParen);
}
return(whereString);
}
}
/// <summary>
/// Render the where condition for a (batch) load by identifier / collection key
/// </summary>
protected SqlStringBuilder WhereString(string alias, string[] columnNames, int batchSize)
{
if (columnNames.Length == 1)
{
// if not a composite key, use "foo in (?, ?, ?)" for batching
// if no batch, and not a composite key, use "foo = ?"
string tableAlias = GenerateAliasForColumn(alias, columnNames[0]);
InFragment inf = new InFragment().SetColumn(tableAlias, columnNames[0]);
for (int i = 0; i < batchSize; i++)
{
inf.AddValue(Parameter.Placeholder);
}
return(new SqlStringBuilder(inf.ToFragmentString()));
}
else
{
Parameter[] columnParameters = Parameter.GenerateParameters(columnNames.Length);
ConditionalFragment byId = new ConditionalFragment()
.SetTableAlias(alias)
.SetCondition(columnNames, columnParameters);
SqlStringBuilder whereString = new SqlStringBuilder();
if (batchSize == 1)
{
// if no batch, use "foo = ? and bar = ?"
whereString.Add(byId.ToSqlStringFragment());
}
else
{
// if a composite key, use "( (foo = ? and bar = ?) or (foo = ? and bar = ?) )" for batching
whereString.Add(StringHelper.OpenParen); // TODO: unnecessary for databases with ANSI-style joins
DisjunctionFragment df = new DisjunctionFragment();
for (int i = 0; i < batchSize; i++)
{
df.AddCondition(byId);
}
whereString.Add(df.ToFragmentString());
whereString.Add(StringHelper.ClosedParen); // TODO: unnecessary for databases with ANSI-style joins
}
return(whereString);
}
}