/// <summary>
        /// Alters the column.
        /// </summary>
        /// <param name="databaseTable">The database table.</param><param name="databaseColumn">The database column.</param><param name="originalColumn">The original column.</param>
        /// <returns/>
        public override string AlterColumn(DatabaseTable databaseTable, DatabaseColumn databaseColumn, DatabaseColumn originalColumn)
        {
            var tableGenerator = CreateTableGenerator(databaseTable);

            if (!AlterColumnIncludeDefaultValue)
            {
                tableGenerator.IncludeDefaultValues = false;
            }
            var columnDefinition   = tableGenerator.WriteColumn(databaseColumn).Trim();
            var originalDefinition = "?";

            if (originalColumn != null)
            {
                originalDefinition = tableGenerator.WriteColumn(originalColumn).Trim();
            }

            //add a nice comment
            var comment = string.Format(CultureInfo.InvariantCulture,
                                        "-- {0} from {1} to {2}",
                                        databaseTable.Name,
                                        originalDefinition,
                                        columnDefinition);

            if (!SupportsAlterColumn)
            {
                //SQLite does not have modify column
                return(comment + Environment.NewLine + "-- TODO: change manually (no ALTER COLUMN)");
            }
            if (databaseColumn.IsPrimaryKey || databaseColumn.IsForeignKey)
            {
                //you can't change primary keys
                //you can't change foreign key columns
                return(comment + Environment.NewLine + "-- TODO: change manually (PK or FK)");
            }

            var dtw      = new DataTypeWriter();
            var dataType = dtw.WriteDataType(databaseColumn);

            var columnDef = Escape(databaseColumn.Name) + " TYPE " +
                            dataType.TrimEnd();

            return(comment +
                   Environment.NewLine +
                   string.Format(CultureInfo.InvariantCulture,
                                 AlterColumnFormat,
                                 TableName(databaseTable),
                                 columnDef.Replace("NOT NULL", String.Empty)) +
                   string.Format("\r\nALTER TABLE {0} ALTER COLUMN {1} {2} NOT NULL;",
                                 TableName(databaseTable), Escape(databaseColumn.Name), (databaseColumn.Nullable ? "DROP" : "SET")));
        }
        /// <summary>
        /// Alters the column.
        /// </summary>
        /// <param name="databaseTable">The database table.</param><param name="databaseColumn">The database column.</param><param name="originalColumn">The original column.</param>
        /// <returns/>
        public override string AlterColumn(DatabaseTable databaseTable, DatabaseColumn databaseColumn, DatabaseColumn originalColumn)
        {
            var tableGenerator = CreateTableGenerator(databaseTable);
            if (!AlterColumnIncludeDefaultValue)
            {
                tableGenerator.IncludeDefaultValues = false;
            }
            var columnDefinition = tableGenerator.WriteColumn(databaseColumn).Trim();
            var originalDefinition = "?";
            if (originalColumn != null)
            {
                originalDefinition = tableGenerator.WriteColumn(originalColumn).Trim();
            }

            //add a nice comment
            var comment = string.Format(CultureInfo.InvariantCulture,
                "-- {0} from {1} to {2}",
                databaseTable.Name,
                originalDefinition,
                columnDefinition);
            if (!SupportsAlterColumn)
            {
                //SQLite does not have modify column
                return comment + Environment.NewLine + "-- TODO: change manually (no ALTER COLUMN)";
            }
            if (databaseColumn.IsPrimaryKey || databaseColumn.IsForeignKey)
            {
                //you can't change primary keys
                //you can't change foreign key columns
                return comment + Environment.NewLine + "-- TODO: change manually (PK or FK)";
            }

            var dtw = new DataTypeWriter();
            var dataType = dtw.WriteDataType(databaseColumn);

            var columnDef = Escape(databaseColumn.Name) + " TYPE " +
                            dataType.TrimEnd();
            return comment +
                Environment.NewLine +
                string.Format(CultureInfo.InvariantCulture,
                    AlterColumnFormat,
                    TableName(databaseTable),
                    columnDef.Replace("NOT NULL", String.Empty)) +
               string.Format("\r\nALTER TABLE {0} ALTER COLUMN {1} {2} NOT NULL;",
               TableName(databaseTable), Escape(databaseColumn.Name), (databaseColumn.Nullable ? "DROP" : "SET"));
        }
        public override void PostProcessing(DatabaseTable databaseTable)
        {
            if (databaseTable == null) return;
            //the devart providers GetSchema are a little weird so we fix them up here
            var typeWriter = new DataTypeWriter();

            foreach (var databaseColumn in databaseTable.Columns)
            {
                var santizedType = typeWriter.WriteDataType(databaseColumn);
                //all the different native types are reworked
                if ((santizedType.StartsWith("VARCHAR", StringComparison.OrdinalIgnoreCase)
                    || santizedType.StartsWith("CHAR", StringComparison.OrdinalIgnoreCase)))
                {
                    if (databaseColumn.Length == -1 && databaseColumn.Precision > 0)
                    {
                        databaseColumn.Length = databaseColumn.Precision;
                        databaseColumn.Precision = -1;
                    }
                }
                if ((santizedType.StartsWith("NUMERIC", StringComparison.OrdinalIgnoreCase)
                     || santizedType.StartsWith("DECIMAL", StringComparison.OrdinalIgnoreCase)
                     || santizedType.StartsWith("INTEGER", StringComparison.OrdinalIgnoreCase)))
                {
                    if (databaseColumn.Length > 0 && databaseColumn.Precision == -1)
                    {
                        databaseColumn.Precision = databaseColumn.Length;
                        databaseColumn.Length = -1;
                    }
                }
                //if it's a varchar or char, and the length is -1 but the precision is positive, swap them
                //and vice versa for numerics.

                var defaultValue = databaseColumn.DefaultValue;
                if (!string.IsNullOrEmpty(defaultValue) && defaultValue.StartsWith("nextval('", StringComparison.OrdinalIgnoreCase))
                {
                    databaseColumn.IsAutoNumber = true;
                    databaseColumn.IsPrimaryKey = true;
                }
                //if defaultValue looks like the nextval from a sequence, it's a pk
                //change the type to serial (or bigserial), ensure it's the primary key
            }
        }
示例#4
0
 public TableGenerator(DatabaseTable table)
     : base(table)
 {
     DataTypeWriter = new DataTypeWriter();
 }
示例#5
0
 public TableGenerator(DatabaseTable table)
     : base(table)
 {
     DataTypeWriter = new DataTypeWriter();
 }