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SharpHSQL - An SQL engine written in C#

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10 Oct 2001CPOL11 min read 306.6K   3.8K   134  
Presenting a high performance SQL engine ported to C# from Java
/*
 * DatabaseInformation.cs
 *
 * Copyright (c) 2001, The HSQL Development Group
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of the HSQL Development Group nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This package is based on HypersonicSQL, originally developed by Thomas Mueller.
 *
 * C# port by Mark Tutt
 *
 */
namespace SharpHSQL
{
	using System;
	using System.Collections;
	using System.Text;

	/**
	 * DatabaseInformation class declaration
	 *
	 *
	 * @version 1.0.0.1
	 */
	class DatabaseInformation 
	{
		private Database	dDatabase;
		private Access		aAccess;
		private ArrayList   tTable;

		/**
		 * Constructor declaration
		 *
		 *
		 * @param db
		 * @param tables
		 * @param access
		 */
		public DatabaseInformation(Database db, ArrayList tables, Access access) 
		{
			dDatabase = db;
			tTable = tables;
			aAccess = access;
		}

		// some drivers use the following titles:
		// static string META_SCHEM="OWNER";
		// static string META_CAT="QUALIFIER";
		// static string META_COLUMN_SIZE="PRECISION";
		// static string META_BUFFER_LENGTH="LENGTH";
		// static string META_DECIMAL_DIGITS="SCALE";
		// static string META_NUM_PREC_RADIX="RADIX";
		// static string META_FIXED_PREC_SCALE="MONEY";
		// static string META_ORDINAL_POSITON="SEQ_IN_INDEX";
		// static string META_ASC_OR_DESC="COLLATION";
		static string META_SCHEM = "SCHEM";
		static string META_CAT = "CAT";
		static string META_COLUMN_SIZE = "COLUMN_SIZE";
		static string META_BUFFER_LENGTH = "BUFFER_LENGTH";
		static string META_DECIMAL_DIGITS = "DECIMAL_DIGITS";
		static string META_NUM_PREC_RADIX = "NUM_PREC_RADIX";
		static string META_FIXED_PREC_SCALE = "FIXED_PREC_SCALE";
		static string META_ORDINAL_POSITON = "ORDINAL_POSITON";
		static string META_ASC_OR_DESC = "ASC_OR_DESC";

		/**
		 * Method declaration
		 *
		 *
		 * @param name
		 * @param channel
		 *
		 * @return
		 *
		 * @throws Exception
		 */
		public Table getSystemTable(string name, Channel channel) 
		{
			if (name.Equals("SYSTEM_PROCEDURES")) 
			{
				Table t = createTable(name);

				t.addColumn("PROCEDURE_" + META_CAT, Column.VARCHAR);
				t.addColumn("PROCEDURE_" + META_SCHEM, Column.VARCHAR);
				t.addColumn("PROCEDURE_NAME", Column.VARCHAR);
				t.addColumn("NUM_INPUT_PARAMS", Column.INTEGER);
				t.addColumn("NUM_OUTPUT_PARAMS", Column.INTEGER);
				t.addColumn("NUM_RESULT_SETS", Column.INTEGER);
				t.addColumn("REMARKS", Column.VARCHAR);
				t.addColumn("PROCEDURE_TYPE", Column.SMALLINT);
				t.createPrimaryKey();

				return t;
			} 
			else if (name.Equals("SYSTEM_PROCEDURECOLUMNS")) 
			{
				Table t = createTable(name);

				t.addColumn("PROCEDURE_" + META_CAT, Column.VARCHAR);
				t.addColumn("PROCEDURE_" + META_SCHEM, Column.VARCHAR);
				t.addColumn("PROCEDURE_NAME", Column.VARCHAR);
				t.addColumn("COLUMN_NAME", Column.VARCHAR);
				t.addColumn("COLUMN_TYPE", Column.SMALLINT);
				t.addColumn("DATA_TYPE", Column.SMALLINT);
				t.addColumn("TYPE_NAME", Column.VARCHAR);
				t.addColumn("PRECISION", Column.INTEGER);
				t.addColumn("LENGTH", Column.INTEGER);
				t.addColumn("SCALE", Column.SMALLINT);
				t.addColumn("RADIX", Column.SMALLINT);
				t.addColumn("NULLABLE", Column.SMALLINT);
				t.addColumn("REMARKS", Column.VARCHAR);
				t.createPrimaryKey();

				return t;
			} 
			else if (name.Equals("SYSTEM_TABLES")) 
			{
				Table t = createTable(name);

				t.addColumn("TABLE_" + META_CAT, Column.VARCHAR);
				t.addColumn("TABLE_" + META_SCHEM, Column.VARCHAR);
				t.addColumn("TABLE_NAME", Column.VARCHAR);
				t.addColumn("TABLE_TYPE", Column.VARCHAR);
				t.addColumn("REMARKS", Column.VARCHAR);
				t.createPrimaryKey();

				for (int i = 0; i < tTable.Count; i++) 
				{
					Table  table = (Table) tTable[i];
					object[] o = t.getNewRow();

					o[2] = table.getName();
					o[3] = "TABLE";

					t.insert(o, null);
				}

				return t;
			} 
			else if (name.Equals("SYSTEM_SCHEMAS")) 
			{
				Table t = createTable(name);

				t.addColumn("TABLE_" + META_SCHEM, Column.VARCHAR);
				t.createPrimaryKey();

				return t;
			} 
			else if (name.Equals("SYSTEM_CATALOGS")) 
			{
				Table t = createTable(name);

				t.addColumn("TABLE_" + META_CAT, Column.VARCHAR);
				t.createPrimaryKey();

				return t;
			} 
			else if (name.Equals("SYSTEM_TABLETYPES")) 
			{
				Table t = createTable(name);

				t.addColumn("TABLE_TYPE", Column.VARCHAR);
				t.createPrimaryKey();

				object[] o = t.getNewRow();

				o[0] = "TABLE";

				t.insert(o, null);

				return t;
			} 
			else if (name.Equals("SYSTEM_COLUMNS")) 
			{
				Table t = createTable(name);

				t.addColumn("TABLE_" + META_CAT, Column.VARCHAR);
				t.addColumn("TABLE_" + META_SCHEM, Column.VARCHAR);
				t.addColumn("TABLE_NAME", Column.VARCHAR);
				t.addColumn("COLUMN_NAME", Column.VARCHAR);
				t.addColumn("DATA_TYPE", Column.SMALLINT);
				t.addColumn("TYPE_NAME", Column.VARCHAR);
				t.addColumn(META_COLUMN_SIZE, Column.INTEGER);
				t.addColumn(META_BUFFER_LENGTH, Column.INTEGER);
				t.addColumn(META_DECIMAL_DIGITS, Column.INTEGER);
				t.addColumn(META_NUM_PREC_RADIX, Column.INTEGER);
				t.addColumn("NULLABLE", Column.INTEGER);
				t.addColumn("REMARKS", Column.VARCHAR);

				// Access and Intersolv do not return this fields
				t.addColumn("COLUMN_DEF", Column.VARCHAR);
				t.addColumn("SQL_DATA_TYPE", Column.VARCHAR);
				t.addColumn("SQL_DATETIME_SUB", Column.INTEGER);
				t.addColumn("CHAR_OCTET_LENGTH", Column.INTEGER);
				t.addColumn("ORDINAL_POSITION", Column.VARCHAR);
				t.addColumn("IS_NULLABLE", Column.VARCHAR);
				t.createPrimaryKey();

				for (int i = 0; i < tTable.Count; i++) 
				{
					Table table = (Table) tTable[i];
					int   columns = table.getColumnCount();

					for (int j = 0; j < columns; j++) 
					{
						object[] o = t.getNewRow();

						o[2] = table.getName();
						o[3] = table.getColumnName(j);
						o[4] = table.getColumnType(j);
						o[5] = Column.getType(table.getColumnType(j));

						int nullable;

						if (table.getColumnIsNullable(j)) 
						{
							nullable = true.ToInt32();
						} 
						else 
						{
							nullable = false.ToInt32();
						}

						o[10] = nullable;

						if (table.getIdentityColumn() == j) 
						{
							o[11] = "IDENTITY";
						}

						t.insert(o, null);
					}
				}

				return t;
			} 
			else if (name.Equals("SYSTEM_COLUMNPRIVILEGES")) 
			{
				Table t = createTable(name);

				t.addColumn("TABLE_" + META_CAT, Column.VARCHAR);
				t.addColumn("TABLE_" + META_SCHEM, Column.VARCHAR);
				t.addColumn("TABLE_NAME", Column.VARCHAR);
				t.addColumn("COLUMN_NAME", Column.VARCHAR);
				t.addColumn("GRANTOR", Column.VARCHAR);
				t.addColumn("GRANTEE", Column.VARCHAR);
				t.addColumn("PRIVILEGE", Column.VARCHAR);
				t.addColumn("IS_GRANTABLE", Column.VARCHAR);
				t.createPrimaryKey();

				/*
				 * // todo: get correct info
				 * for(int i=0;i<tTable.size();i++) {
				 * Table table=(Table)tTable.elementAt(i);
				 * int columns=table.getColumnCount();
				 * for(int j=0;j<columns;j++) {
				 * object o[]=t.getNewRow();
				 * o[2]=table.getName();
				 * o[3]=table.getColumnName(j);
				 * o[4]="sa";
				 * o[6]="FULL";
				 * o[7]="NO";
				 * t.insert(o,null);
				 * }
				 * }
				 */
				return t;
			} 
			else if (name.Equals("SYSTEM_TABLEPRIVILEGES")) 
			{
				Table t = createTable(name);

				t.addColumn("TABLE_" + META_CAT, Column.VARCHAR);
				t.addColumn("TABLE_" + META_SCHEM, Column.VARCHAR);
				t.addColumn("TABLE_NAME", Column.VARCHAR);
				t.addColumn("GRANTOR", Column.VARCHAR);
				t.addColumn("GRANTEE", Column.VARCHAR);
				t.addColumn("PRIVILEGE", Column.VARCHAR);
				t.addColumn("IS_GRANTABLE", Column.VARCHAR);
				t.createPrimaryKey();

				for (int i = 0; i < tTable.Count; i++) 
				{
					Table  table = (Table) tTable[i];
					object[] o = t.getNewRow();

					o[2] = table.getName();
					o[3] = "sa";
					o[5] = "FULL";

					t.insert(o, null);
				}

				return t;
			} 
			else if (name.Equals("SYSTEM_BESTROWIDENTIFIER")) 
			{
				Table t = createTable(name);

				t.addColumn("SCOPE", Column.SMALLINT);
				t.addColumn("COLUMN_NAME", Column.VARCHAR);
				t.addColumn("DATA_TYPE", Column.SMALLINT);
				t.addColumn("TYPE_NAME", Column.VARCHAR);
				t.addColumn(META_COLUMN_SIZE, Column.INTEGER);
				t.addColumn(META_BUFFER_LENGTH, Column.INTEGER);
				t.addColumn(META_DECIMAL_DIGITS, Column.SMALLINT);
				t.addColumn("PSEUDO_COLUMN", Column.SMALLINT);
				t.createPrimaryKey();

				return t;
			} 
			else if (name.Equals("SYSTEM_VERSIONCOLUMNS")) 
			{
				Table t = createTable(name);

				t.addColumn("SCOPE", Column.INTEGER);
				t.addColumn("COLUMN_NAME", Column.VARCHAR);
				t.addColumn("DATA_TYPE", Column.SMALLINT);
				t.addColumn("TYPE_NAME", Column.VARCHAR);
				t.addColumn(META_COLUMN_SIZE, Column.SMALLINT);
				t.addColumn(META_BUFFER_LENGTH, Column.INTEGER);
				t.addColumn(META_DECIMAL_DIGITS, Column.SMALLINT);
				t.addColumn("PSEUDO_COLUMN", Column.SMALLINT);
				t.createPrimaryKey();

				return t;
			} 
			else if (name.Equals("SYSTEM_PRIMARYKEYS")) 
			{
				Table t = createTable(name);

				t.addColumn("TABLE_" + META_CAT, Column.VARCHAR);
				t.addColumn("TABLE_" + META_SCHEM, Column.VARCHAR);
				t.addColumn("TABLE_NAME", Column.VARCHAR);
				t.addColumn("COLUMN_NAME", Column.VARCHAR);
				t.addColumn("KEY_SEQ", Column.SMALLINT);
				t.addColumn("PK_NAME", Column.VARCHAR);
				t.createPrimaryKey();

				for (int i = 0; i < tTable.Count; i++) 
				{
					Table table = (Table) tTable[i];
					Index index = table.getIndex("SYSTEM_PK");
					int[]   cols = index.getColumns();
					int   len = cols.Length;

					for (int j = 0; j < len; j++) 
					{
						object[] o = t.getNewRow();

						o[2] = table.getName();
						o[3] = table.getColumnName(cols[j]);
						o[4] = j + 1;
						o[5] = "SYSTEM_PK";

						t.insert(o, null);
					}
				}

				return t;
			} 
			else if (name.Equals("SYSTEM_IMPORTEDKEYS")) 
			{
				Table t = createTable(name);

				t.addColumn("PKTABLE_" + META_CAT, Column.VARCHAR);
				t.addColumn("PKTABLE_" + META_SCHEM, Column.VARCHAR);
				t.addColumn("PKTABLE_NAME", Column.VARCHAR);
				t.addColumn("PKCOLUMN_NAME", Column.VARCHAR);
				t.addColumn("FKTABLE_" + META_CAT, Column.VARCHAR);
				t.addColumn("FKTABLE_" + META_SCHEM, Column.VARCHAR);
				t.addColumn("FKTABLE_NAME", Column.VARCHAR);
				t.addColumn("FKCOLUMN_NAME", Column.VARCHAR);
				t.addColumn("KEY_SEQ", Column.SMALLINT);
				t.addColumn("UPDATE_RULE", Column.SMALLINT);
				t.addColumn("DELETE_RULE", Column.SMALLINT);
				t.addColumn("FK_NAME", Column.VARCHAR);
				t.addColumn("PK_NAME", Column.VARCHAR);
				t.addColumn("DEFERRABILITY", Column.SMALLINT);
				t.createPrimaryKey();

				return t;
			} 
			else if (name.Equals("SYSTEM_EXPORTEDKEYS")) 
			{
				Table t = createTable(name);

				t.addColumn("PKTABLE_" + META_CAT, Column.VARCHAR);
				t.addColumn("PKTABLE_" + META_SCHEM, Column.VARCHAR);
				t.addColumn("PKTABLE_NAME", Column.VARCHAR);
				t.addColumn("PKCOLUMN_NAME", Column.VARCHAR);
				t.addColumn("FKTABLE_" + META_CAT, Column.VARCHAR);
				t.addColumn("FKTABLE_" + META_SCHEM, Column.VARCHAR);
				t.addColumn("FKTABLE_NAME", Column.VARCHAR);
				t.addColumn("FKCOLUMN_NAME", Column.VARCHAR);
				t.addColumn("KEY_SEQ", Column.SMALLINT);
				t.addColumn("UPDATE_RULE", Column.SMALLINT);
				t.addColumn("DELETE_RULE", Column.SMALLINT);
				t.addColumn("FK_NAME", Column.VARCHAR);
				t.addColumn("PK_NAME", Column.VARCHAR);
				t.addColumn("DEFERRABILITY", Column.SMALLINT);
				t.createPrimaryKey();

				return t;
			} 
			else if (name.Equals("SYSTEM_CROSSREFERENCE")) 
			{
				Table t = createTable(name);

				t.addColumn("PKTABLE_" + META_CAT, Column.VARCHAR);
				t.addColumn("PKTABLE_" + META_SCHEM, Column.VARCHAR);
				t.addColumn("PKTABLE_NAME", Column.VARCHAR);
				t.addColumn("PKCOLUMN_NAME", Column.VARCHAR);
				t.addColumn("FKTABLE_" + META_CAT, Column.VARCHAR);
				t.addColumn("FKTABLE_" + META_SCHEM, Column.VARCHAR);
				t.addColumn("FKTABLE_NAME", Column.VARCHAR);
				t.addColumn("FKCOLUMN_NAME", Column.VARCHAR);
				t.addColumn("KEY_SEQ", Column.INTEGER);
				t.addColumn("UPDATE_RULE", Column.SMALLINT);
				t.addColumn("DELETE_RULE", Column.SMALLINT);
				t.addColumn("FK_NAME", Column.VARCHAR);
				t.addColumn("PK_NAME", Column.VARCHAR);
				t.addColumn("DEFERRABILITY", Column.SMALLINT);
				t.createPrimaryKey();

				return t;
			} 
			else if (name.Equals("SYSTEM_TYPEINFO")) 
			{
				Table t = createTable(name);

				t.addColumn("TYPE_NAME", Column.VARCHAR);
				t.addColumn("DATA_TYPE", Column.SMALLINT);
				t.addColumn("PRECISION", Column.INTEGER);
				t.addColumn("LITERAL_PREFIX", Column.VARCHAR);
				t.addColumn("LITERAL_SUFFIX", Column.VARCHAR);
				t.addColumn("CREATE_PARAMS", Column.VARCHAR);
				t.addColumn("NULLABLE", Column.SMALLINT);
				t.addColumn("CASE_SENSITIVE", Column.VARCHAR);
				t.addColumn("SEARCHABLE", Column.SMALLINT);
				t.addColumn("UNSIGNED_ATTRIBUTE", Column.BIT);
				t.addColumn(META_FIXED_PREC_SCALE, Column.BIT);
				t.addColumn("AUTO_INCREMENT", Column.BIT);
				t.addColumn("LOCAL_TYPE_NAME", Column.VARCHAR);
				t.addColumn("MINIMUM_SCALE", Column.SMALLINT);
				t.addColumn("MAXIMUM_SCALE", Column.SMALLINT);

				// this columns are not supported by Access and Intersolv
				t.addColumn("SQL_DATE_TYPE", Column.INTEGER);
				t.addColumn("SQL_DATETIME_SUB", Column.INTEGER);
				t.addColumn("NUM_PREC_RADIX", Column.INTEGER);
				t.createPrimaryKey();

				for (int i = 0; i < Column.TYPES.Length; i++) 
				{
					object[] o = t.getNewRow();
					int    type = Column.TYPES[i];

					o[0] = Column.getType(type);
					o[1] = type;
					o[2] = 0;		 // precision
					o[6] = true; // need Column to track nullable for this
					o[7] = true;	 // case sensitive
					o[8] = true;;
					o[9] = false;       // unsigned
					o[10] = (type == Column.NUMERIC	|| type == Column.DECIMAL);
					o[11] = (type == Column.INTEGER);
					o[12] = o[0];
					o[13] = 0;
					o[14] = 0;    // maximum scale
					o[15] = 0;
					o[16] = o[15];
					o[17] = 10;

					t.insert(o, null);
				}

				return t;
			} 
			else if (name.Equals("SYSTEM_INDEXINFO")) 
			{
				Table t = createTable(name);

				t.addColumn("TABLE_" + META_CAT, Column.VARCHAR);
				t.addColumn("TABLE_" + META_SCHEM, Column.VARCHAR);
				t.addColumn("TABLE_NAME", Column.VARCHAR);
				t.addColumn("NON_UNIQUE", Column.BIT);
				t.addColumn("INDEX_QUALIFIER", Column.VARCHAR);
				t.addColumn("INDEX_NAME", Column.VARCHAR);
				t.addColumn("TYPE", Column.SMALLINT);
				t.addColumn(META_ORDINAL_POSITON, Column.SMALLINT);
				t.addColumn("COLUMN_NAME", Column.VARCHAR);
				t.addColumn(META_ASC_OR_DESC, Column.VARCHAR);
				t.addColumn("CARDINALITY", Column.INTEGER);
				t.addColumn("PAGES", Column.INTEGER);
				t.addColumn("FILTER_CONDITION", Column.VARCHAR);
				t.createPrimaryKey();

				for (int i = 0; i < tTable.Count; i++) 
				{
					Table table = (Table) tTable[i];
					Index index = null;

					while (true) 
					{
						index = table.getNextIndex(index);

						if (index == null) 
						{
							break;
						}

						int[] cols = index.getColumns();
						int len = cols.Length;

						// this removes the column that makes every index unique
						if (!index.isUnique()) 
						{
							len--;
						}

						for (int j = 0; j < len; j++) 
						{
							object[] o = t.getNewRow();

							o[2] = table.getName();
							o[3] = !index.isUnique();
							o[5] = index.getName();
							o[6] = 1;
							o[7] = (j + 1);
							o[8] = table.getColumnName(cols[j]);
							o[9] = "A";

							t.insert(o, null);
						}
					}
				}

				return t;
			} 
			else if (name.Equals("SYSTEM_UDTS")) 
			{
				Table t = createTable(name);

				t.addColumn("TYPE_" + META_CAT, Column.VARCHAR);
				t.addColumn("TYPE_" + META_SCHEM, Column.VARCHAR);
				t.addColumn("TYPE_NAME", Column.VARCHAR);
				t.addColumn("CLASS_NAME", Column.BIT);
				t.addColumn("DATA_TYPE", Column.VARCHAR);
				t.addColumn("REMARKS", Column.VARCHAR);
				t.createPrimaryKey();

				return t;
			} 
			else if (name.Equals("SYSTEM_CONNECTIONINFO")) 
			{
				Table t = createTable(name);

				t.addColumn("KEY", Column.VARCHAR);
				t.addColumn("VALUE", Column.VARCHAR);
				t.createPrimaryKey();

				object[] o = t.getNewRow();

				o[0] = "USER";
				o[1] = channel.getUsername();

				t.insert(o, null);

				o = t.getNewRow();
				o[0] = "READONLY";
				o[1] = channel.isReadOnly() ? "TRUE" : "FALSE";

				t.insert(o, null);

				o = t.getNewRow();
				o[0] = "MAXROWS";
				o[1] = "" + channel.getMaxRows();

				t.insert(o, null);

				o = t.getNewRow();
				o[0] = "DATABASE";
				o[1] = "" + channel.getDatabase().getName();

				t.insert(o, null);

				o = t.getNewRow();
				o[0] = "IDENTITY";
				o[1] = "" + channel.getLastIdentity();

				t.insert(o, null);

				return t;
			} 
			else if (name.Equals("SYSTEM_USERS")) 
			{
				Table t = createTable(name);

				t.addColumn("USER", Column.VARCHAR);
				t.addColumn("ADMIN", Column.BIT);
				t.createPrimaryKey();

				ArrayList v = aAccess.getUsers();

				for (int i = 0; i < v.Count; i++) 
				{
					User u = (User) v[i];

					// todo: this is not a nice implementation
					if (u == null) 
					{
						continue;
					}

					string user = u.getName();

					if (!user.Equals("PUBLIC")) 
					{
						object[] o = t.getNewRow();

						o[0] = user;
						o[1] = u.isAdmin();

						t.insert(o, null);
					}
				}

				return t;
			}

			return null;
		}

		/**
		 * Method declaration
		 *
		 *
		 * @param bDrop
		 * @param bInsert
		 * @param bCached
		 * @param channel
		 *
		 * @return
		 *
		 * @throws Exception
		 */
		public Result getScript(bool bDrop, bool bInsert, bool bCached,
			Channel channel) 
		{
			channel.checkAdmin();

			Result r = new Result(1);

			r.iType[0] = Column.VARCHAR;
			r.sTable[0] = "SYSTEM_SCRIPT";
			r.sLabel[0] = "COMMAND";
			r.sName[0] = "COMMAND";

			StringBuilder a = new StringBuilder();

			for (int i = 0; i < tTable.Count; i++) 
			{
				Table t = (Table) tTable[i];

				if (bDrop) 
				{
					addRow(r, "DROP TABLE " + t.getName());
				}

				a.Remove(0,a.Length);
				a.Append("CREATE ");

				if (t.isCached()) 
				{
					a.Append("CACHED ");
				}

				a.Append("TABLE ");
				a.Append(t.getName());
				a.Append("(");

				int   columns = t.getColumnCount();
				Index pki = t.getIndex("SYSTEM_PK");
				int   pk = (pki == null) ? -1 : pki.getColumns()[0];

				for (int j = 0; j < columns; j++) 
				{
					a.Append(t.getColumnName(j));
					a.Append(" ");
					a.Append(Column.getType(t.getType(j)));

					if (!t.getColumnIsNullable(j)) 
					{
						a.Append(" NOT NULL");
					}

					if (j == t.getIdentityColumn()) 
					{
						a.Append(" IDENTITY");
					}

					if (j == pk) 
					{
						a.Append(" PRIMARY KEY");
					}

					if (j < columns - 1) 
					{
						a.Append(",");
					}
				}

				ArrayList v = t.getConstraints();

				for (int j = 0; j < v.Count; j++) 
				{
					Constraint c = (Constraint) v[j];

					if (c.getType() == Constraint.FOREIGN_KEY) 
					{
						a.Append(",FOREIGN KEY");

						int[] col = c.getRefColumns();

						a.Append(getColumnList(c.getRef(), col, col.Length));
						a.Append("REFERENCES ");
						a.Append(c.getMain().getName());

						col = c.getMainColumns();

						a.Append(getColumnList(c.getMain(), col, col.Length));
					} 
					else if (c.getType() == Constraint.UNIQUE) 
					{
						a.Append(",UNIQUE");

						int[] col = c.getMainColumns();

						a.Append(getColumnList(c.getMain(), col, col.Length));
					}
				}

				a.Append(")");
				addRow(r, a.ToString());

				Index index = null;

				while (true) 
				{
					index = t.getNextIndex(index);

					if (index == null) 
					{
						break;
					}

					string indexname = index.getName();

					if (indexname.Equals("SYSTEM_PK")) 
					{
						continue;
					} 
					else if (indexname.StartsWith("SYSTEM_FOREIGN_KEY")) 
					{

						// foreign keys where created in the 'create table'
						continue;
					} 
					else if (indexname.StartsWith("SYSTEM_CONSTRAINT")) 
					{

						// constraints where created in the 'create table'
						continue;
					}

					a.Remove(0,a.Length);
					a.Append("CREATE ");

					if (index.isUnique()) 
					{
						a.Append("UNIQUE ");
					}

					a.Append("INDEX ");
					a.Append(indexname);
					a.Append(" ON ");
					a.Append(t.getName());

					int[] col = index.getColumns();
					int len = col.Length;

					if (!index.isUnique()) 
					{
						len--;
					}

					a.Append(getColumnList(t, col, len));
					addRow(r, a.ToString());
				}

				if (bInsert) 
				{
					Index   primary = t.getPrimaryIndex();
					Node    x = primary.first();
					bool integrity = true;

					if (x != null) 
					{
						integrity = false;

						addRow(r, "SET REFERENTIAL_INTEGRITY FALSE");
					}

					while (x != null) 
					{
						addRow(r, t.getInsertStatement(x.getData()));

						x = primary.next(x);
					}

					if (!integrity) 
					{
						addRow(r, "SET REFERENTIAL_INTEGRITY TRUE");
					}
				}

				if (bCached && t.isCached()) 
				{
					a.Remove(0,a.Length);
					a.Append("SET TABLE ");

					a.Append(t.getName());
					a.Append(" INDEX '");
					a.Append(t.getIndexRoots());
					a.Append("'");
					addRow(r, a.ToString());
				}

			}

			ArrayList uList = aAccess.getUsers();

			for (int i = 0; i < uList.Count; i++) 
			{
				User u = (User) uList[i];

				// todo: this is not a nice implementation
				if (u == null) 
				{
					continue;
				}

				string name = u.getName();

				if (!name.Equals("PUBLIC")) 
				{
					a.Remove(0,a.Length);
					a.Append("CREATE USER ");

					a.Append(name);
					a.Append(" PASSWORD ");
					a.Append("\"" + u.getPassword() + "\"");

					if (u.isAdmin()) 
					{
						a.Append(" ADMIN");
					}

					addRow(r, a.ToString());
				}

				Hashtable rights = u.getRights();

				if (rights == null) 
				{
					continue;
				}

				foreach( string dbObject in rights.Keys)
				{
					int    right = (int) rights[dbObject];

					if (right == 0) 
					{
						continue;
					}

					a.Remove(0,a.Length);
					a.Append("GRANT ");

					a.Append(Access.getRight(right));
					a.Append(" ON ");
					a.Append(dbObject);
					a.Append(" TO ");
					a.Append(u.getName());
					addRow(r, a.ToString());
				}
			}

			if (dDatabase.isIgnoreCase()) 
			{
				addRow(r, "SET IGNORECASE TRUE");
			}

			Hashtable   h = dDatabase.getAlias();

			foreach(string alias in h.Keys)
			{
				string java = (string) h[alias];
				addRow(r, "CREATE ALIAS " + alias + " FOR \"" + java + "\"");
			}

			return r;
		}

		/**
		 * Method declaration
		 *
		 *
		 * @param t
		 * @param col
		 * @param len
		 *
		 * @return
		 */
		private string getColumnList(Table t, int[] col, int len) 
		{
			StringBuilder a = new StringBuilder();
			a.Append("(");

			for (int i = 0; i < len; i++) 
			{
				a.Append(t.getColumnName(col[i]));

				if (i < len - 1) 
				{
					a.Append(",");
				}
			}

			return a.Append(")").ToString();
		}

		/**
		 * Method declaration
		 *
		 *
		 * @param r
		 * @param sql
		 */
		private void addRow(Result r, string sql) 
		{
			string[] s = new string[1];

			s[0] = sql;

			r.add(s);
		}

		/**
		 * Method declaration
		 *
		 *
		 * @param name
		 *
		 * @return
		 */
		private Table createTable(string name) 
		{
			return new Table(dDatabase, false, name, false);
		}

	}
}

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