예제 #1
0
        /// <summary>
        /// Write out the SKIP part of sql select statement 
        /// It basically writes SKIP (X).
        /// </summary>
        /// <param name="writer"></param>
        /// <param name="sqlGenerator"></param>
        public void WriteSql(SqlWriter writer, SqlGenerator sqlGenerator)
        {
            writer.Write("SKIP (");
            this.SkipCount.WriteSql(writer, sqlGenerator);
            writer.Write(")");

            writer.Write(" ");
        }
예제 #2
0
        /// <summary>
        /// Write out the FIRST part of sql select statement 
        /// It basically writes FIRST (X).
        /// </summary>
        /// <param name="writer"></param>
        /// <param name="sqlGenerator"></param>
        public void WriteSql(SqlWriter writer, SqlGenerator sqlGenerator)
        {
            writer.Write("FIRST (");
            this.FirstCount.WriteSql(writer, sqlGenerator);
            writer.Write(")");

            writer.Write(" ");
        }
예제 #3
0
 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

            writer.Write("SELECT ");
            if (this.IsDistinct)
            {
                writer.Write("DISTINCT ");
            }

            if (this.First != null)
            {
                this.First.WriteSql(writer, sqlGenerator);
            }

            if (this.Skip != null)
            {
                this.Skip.WriteSql(writer, sqlGenerator);
            }

            if ((this.select == null) || this.Select.IsEmpty)
            {
                Debug.Assert(false);  // we have removed all possibilities of SELECT *.
                writer.Write("*");
            }
            else
            {
                this.Select.WriteSql(writer, sqlGenerator);
            }

            writer.WriteLine();
            writer.Write("FROM ");
            this.From.WriteSql(writer, sqlGenerator);

            if ((this.where != null) && !this.Where.IsEmpty)
            {
                writer.WriteLine();
                writer.Write("WHERE ");
                this.Where.WriteSql(writer, sqlGenerator);
            }

            if ((this.groupBy != null) && !this.GroupBy.IsEmpty)
            {
                writer.WriteLine();
                writer.Write("GROUP BY ");
                this.GroupBy.WriteSql(writer, sqlGenerator);
            }

            if ((this.orderBy != null) && !this.OrderBy.IsEmpty && (this.IsTopMost || this.First != null || this.Skip != null))
            {
                writer.WriteLine();
                writer.Write("ORDER BY ");
                this.OrderBy.WriteSql(writer, sqlGenerator);
            }

            --writer.Indent;
        }
예제 #5
0
 /// <summary>
 /// We delegate the writing of the fragment to the appropriate type.
 /// </summary>
 /// <param name="writer"></param>
 /// <param name="sqlGenerator"></param>
 public 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();
                 }
             }
         }
     }
 }
예제 #6
0
        /// <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)
            {
                string newName;
                int i = sqlGenerator.AllColumnNames[this.NewName];
                do
                {
                    ++i;
                    newName = this.Name + i.ToString(System.Globalization.CultureInfo.InvariantCulture);
                } while (sqlGenerator.AllColumnNames.ContainsKey(newName));
                sqlGenerator.AllColumnNames[this.NewName] = i;

                // Prevent it from being renamed repeatedly.
                this.NeedsRenaming = false;
                this.NewName = newName;

                // Add this column name to list of known names so that there are no subsequent
                // collisions
                sqlGenerator.AllColumnNames[newName] = 0;
            }

            writer.Write(SqlGenerator.QuoteIdentifier(this.NewName));
        }