Added PostgreSqlCommandInterpreter (#8010)

Fixes #7942

src/Orchard/Data/Migration/Interpreters/PostgreSqlCommandInterpreter.cs

@@ -0,0 +1,85 @@
+using NHibernate.Dialect;
+using Orchard.Data.Migration.Schema;
+using Orchard.Environment.Configuration;
+using Orchard.Localization;
+using System;
+using System.Collections.Generic;
+using System.Data;
+using System.Text;
+
+namespace Orchard.Data.Migration.Interpreters {
+    public class PostgreSqlCommandInterpreter : ICommandInterpreter<AlterColumnCommand> {
+        private readonly Lazy<Dialect> _dialectLazy;
+        private readonly ShellSettings _shellSettings;
+        private readonly DefaultDataMigrationInterpreter _dataMigrationInterpreter;
+
+        public PostgreSqlCommandInterpreter(DefaultDataMigrationInterpreter dataMigrationInterpreter) {
+            _dataMigrationInterpreter = dataMigrationInterpreter;
+            T = NullLocalizer.Instance;
+        }
+
+        public string DataProvider {
+            get { return "PostgreSql"; }
+        }
+
+        public Localizer T { get; set; }
+
+        public PostgreSqlCommandInterpreter(
+            ShellSettings shellSettings,
+            ISessionFactoryHolder sessionFactoryHolder) {
+            _shellSettings = shellSettings;
+            _dialectLazy = new Lazy<Dialect>(() => Dialect.GetDialect(sessionFactoryHolder.GetConfiguration().Properties));
+        }
+
+        public string[] CreateStatements(AlterColumnCommand command) {
+            var builder = new StringBuilder();
+
+            builder.AppendFormat("alter table {0} alter column {1} ",
+                            _dialectLazy.Value.QuoteForTableName(PrefixTableName(command.TableName)),
+                            _dialectLazy.Value.QuoteForColumnName(command.ColumnName));
+            var initLength = builder.Length;
+
+            // type
+            if (command.DbType != DbType.Object) {
+                builder.AppendFormat("type {0}",
+                    DefaultDataMigrationInterpreter.GetTypeName(_dialectLazy.Value, command.DbType, command.Length, command.Precision, command.Scale));
+            }
+            else {
+                if (command.Length > 0 || command.Precision > 0 || command.Scale > 0) {
+                    throw new OrchardException(T("Error while executing data migration: you need to specify the field's type in order to change its properties"));
+                }
+            }
+
+            // [default value]
+            var builder2 = new StringBuilder();
+
+            builder2.AppendFormat("alter table {0} alter column {1} ",
+                            _dialectLazy.Value.QuoteForTableName(PrefixTableName(command.TableName)),
+                            _dialectLazy.Value.QuoteForColumnName(command.ColumnName));
+            var initLength2 = builder2.Length;
+
+            if (command.Default != null) {
+                builder2.Append(" set default ").Append(_dataMigrationInterpreter.ConvertToSqlValue(command.Default)).Append(" ");
+            }
+
+            // result
+            var result = new List<string>();
+
+            if (builder.Length > initLength) {
+                result.Add(builder.ToString());
+            }
+
+            if (builder2.Length > initLength2) {
+                result.Add(builder2.ToString());
+            }
+
+            return result.ToArray();
+        }
+
+        private string PrefixTableName(string tableName) {
+            if (string.IsNullOrEmpty(_shellSettings.DataTablePrefix))
+                return tableName;
+            return _shellSettings.DataTablePrefix + "_" + tableName;
+        }
+    }
+}

src/Orchard/Orchard.Framework.csproj

@@ -174,6 +174,7 @@
   <ItemGroup>
     <Compile Include="ContentManagement\Extensions\DriverResultExtensions.cs" />
     <Compile Include="ContentManagement\Handlers\CloneContentContext.cs" />
+    <Compile Include="Data\Migration\Interpreters\PostgreSqlCommandInterpreter.cs" />
     <Compile Include="DisplayManagement\Descriptors\ShapePlacementStrategy\DefaultPlacementParseMatchProviders.cs" />
     <Compile Include="DisplayManagement\Descriptors\ShapePlacementStrategy\IPlacementParseMatchProvider.cs" />
     <Compile Include="Environment\Configuration\ExtensionLocations.cs" />