/// <summary>
/// We delegate the writing of the fragment to the appropriate type.
/// </summary>
/// <param name="writer"></param>
/// <param name="sqlGenerator"></param>
public virtual void WriteSql(SqlWriter writer, SqlGenerator sqlGenerator)
{
if (null != _sqlFragments)
{
foreach (object o in _sqlFragments)
{
string str = (o as String);
if (null != str)
{
writer.Write(str);
}
else
{
ISqlFragment sqlFragment = (o as ISqlFragment);
if (null != sqlFragment)
{
sqlFragment.WriteSql(writer, sqlGenerator);
}
else
{
throw new InvalidOperationException();
}
}
}
}
}
/// <summary>
/// Writes that fragment that represents the optional column
/// if the usage manager says it is used.
/// </summary>
/// <param name="writer"></param>
/// <param name="sqlGenerator"></param>
public bool WriteSqlIfUsed(SqlWriter writer, SqlGenerator sqlGenerator, string separator)
{
if (m_usageManager.IsUsed(m_symbol))
{
writer.Write(separator);
m_builder.WriteSql(writer, sqlGenerator);
return true;
}
return false;
}
/// <summary>
/// Writes the string representing the Select statement:
///
/// SELECT (DISTINCT) (TOP topClause) (optionalColumns) (requiredColumns)
///
/// If Distinct is specified or this is part of a top most statement
/// all optional columns are marked as used.
///
/// Optional columns are only written if marked as used.
/// In addition, if no required columns are specified and no optional columns are
/// marked as used, the first optional column is written.
///
/// </summary>
/// <param name="writer"></param>
/// <param name="sqlGenerator"></param>
public override void WriteSql(SqlWriter writer, SqlGenerator sqlGenerator)
{
writer.Write("SELECT ");
if (IsDistinct)
{
writer.Write("DISTINCT ");
}
if (this.Top != null)
{
this.Top.WriteSql(writer, sqlGenerator);
}
if (this.IsEmpty)
{
Debug.Assert(false); // we have removed all possibilities of SELECT *.
writer.Write("*");
}
else
{
//Print the optional columns if any
bool printedAny = WriteOptionalColumns(writer, sqlGenerator);
if (!base.IsEmpty)
{
if (printedAny)
{
writer.Write(", ");
}
base.WriteSql(writer, sqlGenerator);
}
//If no optional columns were printed and there were no other columns,
// print at least the first optional column
else if (!printedAny)
{
this.m_optionalColumns[0].MarkAsUsed();
m_optionalColumns[0].WriteSqlIfUsed(writer, sqlGenerator, "");
}
}
}
/// <summary>
/// Write out the TOP part of sql select statement
/// It basically writes TOP (X) [WITH TIES].
/// The brackets around X are ommited for Sql8.
/// </summary>
/// <param name="writer"></param>
/// <param name="sqlGenerator"></param>
public void WriteSql(SqlWriter writer, SqlGenerator sqlGenerator)
{
writer.Write("TOP ");
if (sqlGenerator.SqlVersion != SqlVersion.Sql8)
{
writer.Write("(");
}
this.TopCount.WriteSql(writer, sqlGenerator);
if (sqlGenerator.SqlVersion != SqlVersion.Sql8)
{
writer.Write(")");
}
writer.Write(" ");
if (this.WithTies)
{
writer.Write("WITH TIES ");
}
}
/// <summary>
/// Write out the TOP part of sql select statement
/// It basically writes TOP (X) [WITH TIES].
/// The brackets around X are ommited for Sql8.
/// </summary>
/// <param name="writer"></param>
/// <param name="sqlGenerator"></param>
public void WriteSql(SqlWriter writer, SqlGenerator sqlGenerator)
{
writer.Write("TOP ");
if (sqlGenerator.SqlVersion != SqlVersion.Sql8)
{
writer.Write("(");
}
this.TopCount.WriteSql(writer, sqlGenerator);
if (sqlGenerator.SqlVersion != SqlVersion.Sql8)
{
writer.Write(")");
}
writer.Write(" ");
if (this.WithTies)
{
writer.Write("WITH TIES ");
}
}
/// <summary>
/// Writes the optional columns that are used.
/// If this is the topmost statement or distict is specifed as part of the same statement
/// all optoinal columns are written.
/// </summary>
/// <param name="writer"></param>
/// <param name="sqlGenerator"></param>
/// <returns>Whether at least one column got written</returns>
private bool WriteOptionalColumns(SqlWriter writer, SqlGenerator sqlGenerator)
{
if (this.m_optionalColumns == null)
{
return false;
}
if (m_isPartOfTopMostStatement() || IsDistinct)
{
foreach (OptionalColumn column in this.m_optionalColumns)
{
column.MarkAsUsed();
}
}
string separator = "";
bool printedAny = false;
foreach (OptionalColumn column in this.m_optionalColumns)
{
if (column.WriteSqlIfUsed(writer, sqlGenerator, separator))
{
printedAny = true;
separator = ", ";
}
}
return printedAny;
}
/// <summary>
/// Writes the string representing the Select statement:
///
/// SELECT (DISTINCT) (TOP topClause) (optionalColumns) (requiredColumns)
///
/// If Distinct is specified or this is part of a top most statement
/// all optional columns are marked as used.
///
/// Optional columns are only written if marked as used.
/// In addition, if no required columns are specified and no optional columns are
/// marked as used, the first optional column is written.
///
/// </summary>
/// <param name="writer"></param>
/// <param name="sqlGenerator"></param>
public override void WriteSql(SqlWriter writer, SqlGenerator sqlGenerator)
{
writer.Write("SELECT ");
if (IsDistinct)
{
writer.Write("DISTINCT ");
}
if (this.Top != null)
{
this.Top.WriteSql(writer, sqlGenerator);
}
if (this.IsEmpty)
{
Debug.Assert(false); // we have removed all possibilities of SELECT *.
writer.Write("*");
}
else
{
//Print the optional columns if any
bool printedAny = WriteOptionalColumns(writer, sqlGenerator);
if (!base.IsEmpty)
{
if (printedAny)
{
writer.Write(", ");
}
base.WriteSql(writer, sqlGenerator);
}
//If no optional columns were printed and there were no other columns,
// print at least the first optional column
else if (!printedAny)
{
this.m_optionalColumns[0].MarkAsUsed();
m_optionalColumns[0].WriteSqlIfUsed(writer, sqlGenerator, "");
}
}
}
/// <summary>
/// Write out a SQL select statement as a string.
/// We have to
/// <list type="number">
/// <item>Check whether the aliases extents we use in this statement have
/// to be renamed.
/// We first create a list of all the aliases used by the outer extents.
/// For each of the FromExtents( or AllJoinExtents if it is non-null),
/// rename it if it collides with the previous list.
/// </item>
/// <item>Write each of the clauses (if it exists) as a string</item>
/// </list>
/// </summary>
/// <param name="writer"></param>
/// <param name="sqlGenerator"></param>
public void WriteSql(SqlWriter writer, SqlGenerator sqlGenerator)
{
#region Check if FROM aliases need to be renamed
// Create a list of the aliases used by the outer extents
// JoinSymbols have to be treated specially.
List<string> outerExtentAliases = null;
if ((null != outerExtents) && (0 < outerExtents.Count))
{
foreach (Symbol outerExtent in outerExtents.Keys)
{
JoinSymbol joinSymbol = outerExtent as JoinSymbol;
if (joinSymbol != null)
{
foreach (Symbol symbol in joinSymbol.FlattenedExtentList)
{
if (null == outerExtentAliases) { outerExtentAliases = new List<string>(); }
outerExtentAliases.Add(symbol.NewName);
}
}
else
{
if (null == outerExtentAliases) { outerExtentAliases = new List<string>(); }
outerExtentAliases.Add(outerExtent.NewName);
}
}
}
// An then rename each of the FromExtents we have
// If AllJoinExtents is non-null - it has precedence.
// The new name is derived from the old name - we append an increasing int.
List<Symbol> extentList = this.AllJoinExtents ?? this.fromExtents;
if (null != extentList)
{
foreach (Symbol fromAlias in extentList)
{
if ((null != outerExtentAliases) && outerExtentAliases.Contains(fromAlias.Name))
{
int i = sqlGenerator.AllExtentNames[fromAlias.Name];
string newName;
do
{
++i;
newName = fromAlias.Name + i.ToString(System.Globalization.CultureInfo.InvariantCulture);
}
while (sqlGenerator.AllExtentNames.ContainsKey(newName));
sqlGenerator.AllExtentNames[fromAlias.Name] = i;
fromAlias.NewName = newName;
// Add extent to list of known names (although i is always incrementing, "prefix11" can
// eventually collide with "prefix1" when it is extended)
sqlGenerator.AllExtentNames[newName] = 0;
}
// Add the current alias to the list, so that the extents
// that follow do not collide with me.
if (null == outerExtentAliases) { outerExtentAliases = new List<string>(); }
outerExtentAliases.Add(fromAlias.NewName);
}
}
#endregion
// Increase the indent, so that the Sql statement is nested by one tab.
writer.Indent += 1; // ++ can be confusing in this context
this.select.WriteSql(writer, sqlGenerator);
writer.WriteLine();
writer.Write("FROM ");
this.From.WriteSql(writer, sqlGenerator);
if ((null != this.where) && !this.Where.IsEmpty)
{
writer.WriteLine();
writer.Write("WHERE ");
this.Where.WriteSql(writer, sqlGenerator);
}
if ((null != this.groupBy) && !this.GroupBy.IsEmpty)
{
writer.WriteLine();
writer.Write("GROUP BY ");
this.GroupBy.WriteSql(writer, sqlGenerator);
}
if ((null != this.orderBy) && !this.OrderBy.IsEmpty && (this.IsTopMost || this.Select.Top != null))
{
writer.WriteLine();
writer.Write("ORDER BY ");
this.OrderBy.WriteSql(writer, sqlGenerator);
}
--writer.Indent;
}
/// <summary>
/// Write this symbol out as a string for sql. This is just
/// the new name of the symbol (which could be the same as the old name).
///
/// We rename columns here if necessary.
/// </summary>
/// <param name="writer"></param>
/// <param name="sqlGenerator"></param>
public void WriteSql(SqlWriter writer, SqlGenerator sqlGenerator)
{
if (this.NeedsRenaming)
{
int i;
if (sqlGenerator.AllColumnNames.TryGetValue(this.NewName, out i))
{
string newNameCandidate;
do
{
++i;
newNameCandidate = this.NewName + i.ToString(System.Globalization.CultureInfo.InvariantCulture);
} while (sqlGenerator.AllColumnNames.ContainsKey(newNameCandidate));
sqlGenerator.AllColumnNames[this.NewName] = i;
this.NewName = newNameCandidate;
}
// Add this column name to list of known names so that there are no subsequent
// collisions
sqlGenerator.AllColumnNames[this.NewName] = 0;
// Prevent it from being renamed repeatedly.
this.NeedsRenaming = false;
}
writer.Write(SqlGenerator.QuoteIdentifier(this.NewName));
}
public void WriteSql(SqlWriter writer, SqlGenerator sqlGenerator)
{
// Symbol pair should never be part of a SqlBuilder.
Debug.Assert(false);
}
public void WriteSql(SqlWriter writer, SqlGenerator sqlGenerator)
{
// Symbol pair should never be part of a SqlBuilder.
Debug.Assert(false);
}
/// <summary>
/// Write out a SQL select statement as a string.
/// We have to
/// <list type="number">
/// <item>Check whether the aliases extents we use in this statement have
/// to be renamed.
/// We first create a list of all the aliases used by the outer extents.
/// For each of the FromExtents( or AllJoinExtents if it is non-null),
/// rename it if it collides with the previous list.
/// </item>
/// <item>Write each of the clauses (if it exists) as a string</item>
/// </list>
/// </summary>
/// <param name="writer"></param>
/// <param name="sqlGenerator"></param>
public void WriteSql(SqlWriter writer, SqlGenerator sqlGenerator)
{
#region Check if FROM aliases need to be renamed
// Create a list of the aliases used by the outer extents
// JoinSymbols have to be treated specially.
List <string> outerExtentAliases = null;
if ((null != outerExtents) && (0 < outerExtents.Count))
{
foreach (Symbol outerExtent in outerExtents.Keys)
{
JoinSymbol joinSymbol = outerExtent as JoinSymbol;
if (joinSymbol != null)
{
foreach (Symbol symbol in joinSymbol.FlattenedExtentList)
{
if (null == outerExtentAliases)
{
outerExtentAliases = new List <string>();
}
outerExtentAliases.Add(symbol.NewName);
}
}
else
{
if (null == outerExtentAliases)
{
outerExtentAliases = new List <string>();
}
outerExtentAliases.Add(outerExtent.NewName);
}
}
}
// An then rename each of the FromExtents we have
// If AllJoinExtents is non-null - it has precedence.
// The new name is derived from the old name - we append an increasing int.
List <Symbol> extentList = this.AllJoinExtents ?? this.fromExtents;
if (null != extentList)
{
foreach (Symbol fromAlias in extentList)
{
if ((null != outerExtentAliases) && outerExtentAliases.Contains(fromAlias.Name))
{
int i = sqlGenerator.AllExtentNames[fromAlias.Name];
string newName;
do
{
++i;
newName = fromAlias.Name + i.ToString(System.Globalization.CultureInfo.InvariantCulture);
}while (sqlGenerator.AllExtentNames.ContainsKey(newName));
sqlGenerator.AllExtentNames[fromAlias.Name] = i;
fromAlias.NewName = newName;
// Add extent to list of known names (although i is always incrementing, "prefix11" can
// eventually collide with "prefix1" when it is extended)
sqlGenerator.AllExtentNames[newName] = 0;
}
// Add the current alias to the list, so that the extents
// that follow do not collide with me.
if (null == outerExtentAliases)
{
outerExtentAliases = new List <string>();
}
outerExtentAliases.Add(fromAlias.NewName);
}
}
#endregion
// Increase the indent, so that the Sql statement is nested by one tab.
writer.Indent += 1; // ++ can be confusing in this context
this.select.WriteSql(writer, sqlGenerator);
writer.WriteLine();
writer.Write("FROM ");
this.From.WriteSql(writer, sqlGenerator);
if ((null != this.where) && !this.Where.IsEmpty)
{
writer.WriteLine();
writer.Write("WHERE ");
this.Where.WriteSql(writer, sqlGenerator);
}
if ((null != this.groupBy) && !this.GroupBy.IsEmpty)
{
writer.WriteLine();
writer.Write("GROUP BY ");
this.GroupBy.WriteSql(writer, sqlGenerator);
}
if ((null != this.orderBy) && !this.OrderBy.IsEmpty && (this.IsTopMost || this.Select.Top != null))
{
writer.WriteLine();
writer.Write("ORDER BY ");
this.OrderBy.WriteSql(writer, sqlGenerator);
}
--writer.Indent;
}
