376 lines
14 KiB
C#
376 lines
14 KiB
C#
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// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
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using System;
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using System.Collections.Generic;
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using System.Data.Metadata.Edm;
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using System.Globalization;
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using System.IO;
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using System.Linq;
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using System.Text;
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namespace SampleEntityFrameworkProvider
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{
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sealed class DdlBuilder
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{
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private readonly StringBuilder stringBuilder = new StringBuilder();
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private readonly HashSet<EntitySet> ignoredEntitySets = new HashSet<EntitySet>();
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internal static string CreateObjectsScript(StoreItemCollection itemCollection)
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{
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DdlBuilder builder = new DdlBuilder();
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foreach (EntityContainer container in itemCollection.GetItems<EntityContainer>())
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{
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var entitySets = container.BaseEntitySets.OfType<EntitySet>().OrderBy(s => s.Name);
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var schemas = new HashSet<string>(entitySets.Select(s => GetSchemaName(s)));
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foreach (string schema in schemas.OrderBy(s => s))
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{
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// don't bother creating default schema
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if (schema != "dbo")
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{
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builder.AppendCreateSchema(schema);
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}
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}
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foreach (EntitySet entitySet in container.BaseEntitySets.OfType<EntitySet>().OrderBy(s => s.Name))
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{
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builder.AppendCreateTable(entitySet);
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}
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foreach (AssociationSet associationSet in container.BaseEntitySets.OfType<AssociationSet>().OrderBy(s => s.Name))
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{
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builder.AppendCreateForeignKeys(associationSet);
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}
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}
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return builder.GetCommandText();
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}
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internal static string CreateDatabaseScript(string databaseName, string dataFileName, string logFileName)
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{
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var builder = new DdlBuilder();
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builder.AppendSql("create database ");
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builder.AppendIdentifier(databaseName);
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if (null != dataFileName)
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{
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builder.AppendSql(" on primary ");
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builder.AppendFileName(dataFileName);
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builder.AppendSql(" log on ");
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builder.AppendFileName(logFileName);
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}
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return builder.stringBuilder.ToString();
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}
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internal static string CreateDatabaseExistsScript(string databaseName)
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{
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var builder = new DdlBuilder();
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builder.AppendSql("SELECT Count(*) FROM ");
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builder.AppendSql("sys.databases");
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builder.AppendSql(" WHERE [name]=");
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builder.AppendStringLiteral(databaseName);
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return builder.stringBuilder.ToString();
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}
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internal static string DropDatabaseScript(string databaseName)
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{
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var builder = new DdlBuilder();
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builder.AppendSql("drop database ");
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builder.AppendIdentifier(databaseName);
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return builder.stringBuilder.ToString();
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}
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internal string GetCommandText()
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{
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return this.stringBuilder.ToString();
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}
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private static string GetSchemaName(EntitySet entitySet)
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{
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var schemaName = entitySet.MetadataProperties["Schema"].Value as string;
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return schemaName ?? entitySet.EntityContainer.Name;
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}
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private static string GetTableName(EntitySet entitySet)
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{
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string tableName = entitySet.MetadataProperties["Table"].Value as string;
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return tableName ?? entitySet.Name;
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}
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private void AppendCreateForeignKeys(AssociationSet associationSet)
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{
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var constraint = associationSet.ElementType.ReferentialConstraints.Single();
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var principalEnd = associationSet.AssociationSetEnds[constraint.FromRole.Name];
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var dependentEnd = associationSet.AssociationSetEnds[constraint.ToRole.Name];
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// If any of the participating entity sets was skipped, skip the association too
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if (ignoredEntitySets.Contains(principalEnd.EntitySet) || ignoredEntitySets.Contains(dependentEnd.EntitySet))
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{
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AppendSql("-- Ignoring association set with participating entity set with defining query: ");
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AppendIdentifierEscapeNewLine(associationSet.Name);
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}
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else
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{
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AppendSql("alter table ");
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AppendIdentifier(dependentEnd.EntitySet);
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AppendSql(" add constraint ");
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AppendIdentifier(associationSet.Name);
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AppendSql(" foreign key (");
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AppendIdentifiers(constraint.ToProperties);
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AppendSql(") references ");
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AppendIdentifier(principalEnd.EntitySet);
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AppendSql("(");
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AppendIdentifiers(constraint.FromProperties);
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AppendSql(")");
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if (principalEnd.CorrespondingAssociationEndMember.DeleteBehavior == OperationAction.Cascade)
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{
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AppendSql(" on delete cascade");
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}
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AppendSql(";");
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}
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AppendNewLine();
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}
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private void AppendCreateTable(EntitySet entitySet)
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{
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//If the entity set has defining query, skip it
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if (entitySet.MetadataProperties["DefiningQuery"].Value != null)
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{
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AppendSql("-- Ignoring entity set with defining query: ");
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AppendIdentifier(entitySet, AppendIdentifierEscapeNewLine);
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ignoredEntitySets.Add(entitySet);
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}
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else
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{
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AppendSql("create table ");
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AppendIdentifier(entitySet);
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AppendSql(" (");
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AppendNewLine();
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foreach (EdmProperty column in entitySet.ElementType.Properties)
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{
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AppendSql(" ");
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AppendIdentifier(column.Name);
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AppendSql(" ");
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AppendType(column);
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AppendSql(",");
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AppendNewLine();
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}
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AppendSql(" primary key (");
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AppendJoin(entitySet.ElementType.KeyMembers, k => AppendIdentifier(k.Name), ", ");
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AppendSql(")");
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AppendNewLine();
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AppendSql(");");
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}
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AppendNewLine();
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}
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private void AppendCreateSchema(string schema)
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{
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AppendSql("if (schema_id(");
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AppendStringLiteral(schema);
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AppendSql(") is null) exec(");
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// need to create a sub-command and escape it as a string literal as well...
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DdlBuilder schemaBuilder = new DdlBuilder();
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schemaBuilder.AppendSql("create schema ");
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schemaBuilder.AppendIdentifier(schema);
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AppendStringLiteral(schemaBuilder.stringBuilder.ToString());
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AppendSql(");");
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AppendNewLine();
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}
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private void AppendIdentifier(EntitySet table)
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{
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AppendIdentifier(table, AppendIdentifier);
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}
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private void AppendIdentifier(EntitySet table, Action<string> AppendIdentifierEscape)
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{
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string schemaName = GetSchemaName(table);
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string tableName = GetTableName(table);
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if (schemaName != null)
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{
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AppendIdentifierEscape(schemaName);
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AppendSql(".");
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}
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AppendIdentifierEscape(tableName);
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}
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private void AppendStringLiteral(string literalValue)
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{
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AppendSql("N'" + literalValue.Replace("'", "''") + "'");
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}
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private void AppendIdentifiers(IEnumerable<EdmProperty> properties)
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{
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AppendJoin(properties, p => AppendIdentifier(p.Name), ", ");
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}
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private void AppendIdentifier(string identifier)
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{
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AppendSql("[" + identifier.Replace("]", "]]") + "]");
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}
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private void AppendIdentifierEscapeNewLine(string identifier)
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{
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AppendIdentifier(identifier.Replace("\r", "\r--").Replace("\n", "\n--"));
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}
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private void AppendFileName(string path)
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{
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AppendSql("(name=");
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AppendStringLiteral(Path.GetFileName(path));
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AppendSql(", filename=");
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AppendStringLiteral(path);
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AppendSql(")");
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}
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private void AppendJoin<T>(IEnumerable<T> elements, Action<T> appendElement, string unencodedSeparator)
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{
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bool first = true;
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foreach (T element in elements)
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{
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if (first)
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{
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first = false;
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}
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else
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{
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AppendSql(unencodedSeparator);
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}
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appendElement(element);
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}
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}
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private void AppendType(EdmProperty column)
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{
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TypeUsage type = column.TypeUsage;
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// check for rowversion-like configurations
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Facet storeGenFacet;
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bool isTimestamp = false;
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if (type.EdmType.Name == "binary" &&
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8 == type.GetMaxLength() &&
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column.TypeUsage.Facets.TryGetValue("StoreGeneratedPattern", false, out storeGenFacet) &&
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storeGenFacet.Value != null &&
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StoreGeneratedPattern.Computed == (StoreGeneratedPattern)storeGenFacet.Value)
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{
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isTimestamp = true;
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AppendIdentifier("rowversion");
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}
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else
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{
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string typeName = type.EdmType.Name;
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// Special case: the EDM treats 'nvarchar(max)' as a type name, but SQL Server treats
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// it as a type 'nvarchar' and a type qualifier. As such, we can't escape the entire
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// type name as the EDM sees it.
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const string maxSuffix = "(max)";
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if (type.EdmType.BuiltInTypeKind == BuiltInTypeKind.PrimitiveType && typeName.EndsWith(maxSuffix, StringComparison.Ordinal))
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{
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//Debug.Assert(new[] { "nvarchar(max)", "varchar(max)", "varbinary(max)" }.Contains(typeName),
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// "no other known SQL Server primitive types types accept (max)");
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AppendIdentifier(typeName.Substring(0, typeName.Length - maxSuffix.Length));
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AppendSql("(max)");
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}
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else
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{
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AppendIdentifier(typeName);
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}
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switch (type.EdmType.Name)
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{
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case "decimal":
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case "numeric":
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AppendSqlInvariantFormat("({0}, {1})", type.GetPrecision(), type.GetScale());
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break;
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case "datetime2":
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case "datetimeoffset":
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case "time":
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AppendSqlInvariantFormat("({0})", type.GetPrecision());
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break;
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case "binary":
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case "varbinary":
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case "nvarchar":
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case "varchar":
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case "char":
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case "nchar":
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AppendSqlInvariantFormat("({0})", type.GetMaxLength());
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break;
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default:
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break;
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}
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}
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AppendSql(column.Nullable ? " null" : " not null");
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if (!isTimestamp && column.TypeUsage.Facets.TryGetValue("StoreGeneratedPattern", false, out storeGenFacet) &&
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storeGenFacet.Value != null)
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{
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StoreGeneratedPattern storeGenPattern = (StoreGeneratedPattern)storeGenFacet.Value;
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if (storeGenPattern == StoreGeneratedPattern.Identity)
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{
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if (type.EdmType.Name == "uniqueidentifier")
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{
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AppendSql(" default newid()");
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}
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else
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{
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AppendSql(" identity");
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}
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}
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}
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}
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/// <summary>
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/// Appends raw SQL into the string builder.
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/// </summary>
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/// <param name="text">Raw SQL string to append into the string builder.</param>
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private void AppendSql(string text)
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{
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stringBuilder.Append(text);
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}
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/// <summary>
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/// Appends new line for visual formatting or for ending a comment.
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/// </summary>
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private void AppendNewLine()
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{
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stringBuilder.Append("\r\n");
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}
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/// <summary>
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/// Append raw SQL into the string builder with formatting options and invariant culture formatting.
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/// </summary>
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/// <param name="format">A composite format string.</param>
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/// <param name="args">An array of objects to format.</param>
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private void AppendSqlInvariantFormat(string format, params object[] args)
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{
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stringBuilder.AppendFormat(CultureInfo.InvariantCulture, format, args);
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}
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}
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internal static class MetadataHelper
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{
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internal static byte GetPrecision(this TypeUsage type)
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{
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return type.GetFacetValue<byte>("Precision");
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}
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internal static byte GetScale(this TypeUsage type)
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{
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return type.GetFacetValue<byte>("Scale");
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}
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internal static int GetMaxLength(this TypeUsage type)
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{
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return type.GetFacetValue<int>("MaxLength");
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}
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internal static T GetFacetValue<T>(this TypeUsage type, string facetName)
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{
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return (T)type.Facets[facetName].Value;
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}
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}
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}
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