示例#1
0
        public void Methods_should_delegate_to_underlying_string_builder()
        {
            var sqlStringBuilder = new SqlStringBuilder();

            sqlStringBuilder.Append("foo");
            sqlStringBuilder.AppendLine("bar");
            sqlStringBuilder.AppendLine();

            Assert.Equal(10, sqlStringBuilder.Length);
        }
        public void Visit_DbScanExpression_appends_SQL_if_defining_query_is_not_set()
        {
            var builder = new SqlStringBuilder();
            var insertTree = new DbInsertCommandTree();

            new DmlSqlGenerator.ExpressionTranslator(
                builder, insertTree, true, new SqlGenerator(SqlVersion.Sql10))
                .Visit(CreateMockScanExpression(null).Object);

            Assert.Equal("[Kontainer].[Binky]", builder.ToString());
        }
示例#3
0
        public void AppendKeyWord_should_case_based_on_property()
        {
            var sqlStringBuilder = new SqlStringBuilder();

            sqlStringBuilder.AppendKeyword("select");

            Assert.Equal("select", sqlStringBuilder.ToString());

            sqlStringBuilder.UpperCaseKeywords = true;

            sqlStringBuilder.AppendKeyword(" from");

            Assert.Equal("select FROM", sqlStringBuilder.ToString());
        }
            // <summary>
            // Initialize a new expression translator populating the given string builder
            // with command text. Command text builder and command tree must not be null.
            // </summary>
            // <param name="commandText"> Command text with which to populate commands </param>
            // <param name="commandTree"> Command tree generating SQL </param>
            // <param name="preserveMemberValues"> Indicates whether the translator should preserve member values while compiling t-SQL (only needed for server generation) </param>
            internal ExpressionTranslator(
                SqlStringBuilder commandText,
                DbModificationCommandTree commandTree,
                bool preserveMemberValues,
                SqlGenerator sqlGenerator,
                ICollection<EdmProperty> localVariableBindings = null,
                bool createParameters = true)
            {
                DebugCheck.NotNull(commandText);
                DebugCheck.NotNull(commandTree);

                _commandText = commandText;
                _commandTree = commandTree;
                _sqlGenerator = sqlGenerator;
                _localVariableBindings = localVariableBindings;

                _parameters = new List<SqlParameter>();

                _memberValues = preserveMemberValues
                                    ? new Dictionary<EdmMember, SqlParameter>()
                                    : null;

                _createParameters = createParameters;
            }
        // <summary>
        // Generates SQL fragment returning server-generated values.
        // Requires: translator knows about member values so that we can figure out
        // how to construct the key predicate.
        // <code>Sample SQL:
        // 
        //     select IdentityValue
        //     from dbo.MyTable
        //     where @@ROWCOUNT > 0 and IdentityValue = scope_identity()
        // 
        //     or
        // 
        //     select TimestampValue
        //     from dbo.MyTable
        //     where @@ROWCOUNT > 0 and Id = 1
        // 
        //     Note that we filter on rowcount to ensure no rows are returned if no rows were modified.
        // 
        //     On SQL Server 2005 and up, we have an additional syntax used for non integer return types:
        // 
        //     declare @generatedValues table(ID uniqueidentifier)
        //     insert dbo.MyTable
        //     output ID into @generated_values
        //     values (...);
        //     select ID
        //     from @generatedValues as g join dbo.MyTable as t on g.ID = t.ID
        //     where @@ROWCOUNT > 0;</code>
        // </summary>
        // <param name="commandText"> Builder containing command text </param>
        // <param name="tree"> Modification command tree </param>
        // <param name="tableType"> Type of table. </param>
        // <param name="translator"> Translator used to produce DML SQL statement for the tree </param>
        // <param name="returning"> Returning expression. If null, the method returns immediately without producing a SELECT statement. </param>
        internal static void GenerateReturningSql(
            SqlStringBuilder commandText,
            DbModificationCommandTree tree,
            EntityType tableType,
            ExpressionTranslator translator,
            DbExpression returning,
            bool useGeneratedValuesVariable)
        {
            // Nothing to do if there is no Returning expression
            if (null == returning)
            {
                return;
            }

            // select
            commandText.AppendKeyword("select ");
            if (useGeneratedValuesVariable)
            {
                translator.PropertyAlias = "t";
            }
            returning.Accept(translator);
            if (useGeneratedValuesVariable)
            {
                translator.PropertyAlias = null;
            }
            commandText.AppendLine();

            if (useGeneratedValuesVariable)
            {
                // from @generated_keys
                commandText.AppendKeyword("from ");
                commandText.Append(GeneratedValuesVariableName);
                commandText.AppendKeyword(" as ");
                commandText.Append("g");
                commandText.AppendKeyword(" join ");
                tree.Target.Expression.Accept(translator);
                commandText.AppendKeyword(" as ");
                commandText.Append("t");
                commandText.AppendKeyword(" on ");
                var separator = string.Empty;
                foreach (var keyMember in tableType.KeyMembers)
                {
                    commandText.AppendKeyword(separator);
                    separator = " and ";
                    commandText.Append("g.");
                    var memberTSql = GenerateMemberTSql(keyMember);
                    commandText.Append(memberTSql);
                    commandText.Append(" = t.");
                    commandText.Append(memberTSql);
                }
                commandText.AppendLine();
                commandText.AppendKeyword("where @@ROWCOUNT > 0");
            }
            else
            {
                // from
                commandText.AppendKeyword("from ");
                tree.Target.Expression.Accept(translator);
                commandText.AppendLine();

                // where
                commandText.AppendKeyword("where @@ROWCOUNT > 0");
                var table = ((DbScanExpression)tree.Target.Expression).Target;
                var identity = false;
                foreach (var keyMember in table.ElementType.KeyMembers)
                {
                    commandText.AppendKeyword(" and ");
                    commandText.Append(GenerateMemberTSql(keyMember));
                    commandText.Append(" = ");

                    // retrieve member value sql. the translator remembers member values
                    // as it constructs the DML statement (which precedes the "returning"
                    // SQL)
                    SqlParameter value;
                    if (translator.MemberValues.TryGetValue(keyMember, out value))
                    {
                        commandText.Append(value.ParameterName);
                    }
                    else
                    {
                        // if no value is registered for the key member, it means it is an identity
                        // which can be retrieved using the scope_identity() function
                        if (identity)
                        {
                            // there can be only one server generated key
                            throw new NotSupportedException(Strings.Update_NotSupportedServerGenKey(table.Name));
                        }

                        if (!IsValidScopeIdentityColumnType(keyMember.TypeUsage))
                        {
                            throw new InvalidOperationException(
                                Strings.Update_NotSupportedIdentityType(
                                    keyMember.Name, keyMember.TypeUsage.ToString()));
                        }

                        commandText.Append("scope_identity()");
                        identity = true;
                    }
                }
            }
        }
        internal static string GenerateUpdateSql(
            DbUpdateCommandTree tree,
            SqlGenerator sqlGenerator,
            out List<SqlParameter> parameters,
            bool generateReturningSql = true,
            bool upperCaseKeywords = true)
        {
            const string dummySetParameter = "@p";

            var commandText
                = new SqlStringBuilder(CommandTextBuilderInitialCapacity)
                      {
                          UpperCaseKeywords = upperCaseKeywords
                      };

            var translator = new ExpressionTranslator(commandText, tree, null != tree.Returning, sqlGenerator);

            if (tree.SetClauses.Count == 0)
            {
                commandText.AppendKeyword("declare ");
                commandText.AppendLine(dummySetParameter + " int");
            }

            // update [schemaName].[tableName]
            commandText.AppendKeyword("update ");
            tree.Target.Expression.Accept(translator);
            commandText.AppendLine();

            // set c1 = ..., c2 = ..., ...
            var first = true;
            commandText.AppendKeyword("set ");
            foreach (DbSetClause setClause in tree.SetClauses)
            {
                if (first)
                {
                    first = false;
                }
                else
                {
                    commandText.Append(", ");
                }
                setClause.Property.Accept(translator);
                commandText.Append(" = ");
                setClause.Value.Accept(translator);
            }

            if (first)
            {
                // If first is still true, it indicates there were no set
                // clauses. Introduce a fake set clause so that:
                // - we acquire the appropriate locks
                // - server-gen columns (e.g. timestamp) get recomputed
                //
                // We use the following pattern:
                //
                //  update SomeTable
                //  set @p = 0
                //  where ...
                commandText.Append(dummySetParameter + " = 0");
            }
            commandText.AppendLine();

            // where c1 = ..., c2 = ...
            commandText.AppendKeyword("where ");
            tree.Predicate.Accept(translator);
            commandText.AppendLine();

            if (generateReturningSql)
            {
                GenerateReturningSql(commandText, tree, null, translator, tree.Returning, false);
            }

            parameters = translator.Parameters;

            return commandText.ToString();
        }
        internal static string GenerateInsertSql(
            DbInsertCommandTree tree,
            SqlGenerator sqlGenerator,
            out List<SqlParameter> parameters,
            bool generateReturningSql = true,
            bool upperCaseKeywords = true,
            bool createParameters = true)
        {
            var commandText
                = new SqlStringBuilder(CommandTextBuilderInitialCapacity)
                      {
                          UpperCaseKeywords = upperCaseKeywords
                      };

            var translator
                = new ExpressionTranslator(
                    commandText,
                    tree,
                    null != tree.Returning,
                    sqlGenerator,
                    createParameters: createParameters);

            var useGeneratedValuesVariable = UseGeneratedValuesVariable(tree, sqlGenerator.SqlVersion);
            var tableType = (EntityType)((DbScanExpression)tree.Target.Expression).Target.ElementType;

            if (useGeneratedValuesVariable)
            {
                // manufacture the variable, e.g. "declare @generated_values table(id uniqueidentifier)"
                commandText
                    .AppendKeyword("declare ")
                    .Append(GeneratedValuesVariableName)
                    .Append(" table(");
                var first = true;
                foreach (var column in tableType.KeyMembers)
                {
                    if (first)
                    {
                        first = false;
                    }
                    else
                    {
                        commandText.Append(", ");
                    }
                    commandText
                        .Append(GenerateMemberTSql(column))
                        .Append(" ")
                        .Append(GetVariableType(sqlGenerator, column));
                    Facet collationFacet;
                    if (column.TypeUsage.Facets.TryGetValue(DbProviderManifest.CollationFacetName, false, out collationFacet))
                    {
                        var collation = collationFacet.Value as string;
                        if (!string.IsNullOrEmpty(collation))
                        {
                            commandText.AppendKeyword(" collate ").Append(collation);
                        }
                    }
                }
                Debug.Assert(!first, "if useGeneratedValuesVariable is true, it implies some columns do not have values");
                commandText.AppendLine(")");
            }

            // insert [schemaName].[tableName]
            commandText.AppendKeyword("insert ");
            tree.Target.Expression.Accept(translator);

            if (0 < tree.SetClauses.Count)
            {
                // (c1, c2, c3, ...)
                commandText.Append("(");
                var first = true;
                foreach (DbSetClause setClause in tree.SetClauses)
                {
                    if (first)
                    {
                        first = false;
                    }
                    else
                    {
                        commandText.Append(", ");
                    }
                    setClause.Property.Accept(translator);
                }
                commandText.AppendLine(")");
            }
            else
            {
                commandText.AppendLine();
            }

            if (useGeneratedValuesVariable)
            {
                // output inserted.id into @generated_values
                commandText.AppendKeyword("output ");
                var first = true;
                foreach (var column in tableType.KeyMembers)
                {
                    if (first)
                    {
                        first = false;
                    }
                    else
                    {
                        commandText.Append(", ");
                    }
                    commandText.Append("inserted.");
                    commandText.Append(GenerateMemberTSql(column));
                }
                commandText
                    .AppendKeyword(" into ")
                    .AppendLine(GeneratedValuesVariableName);
            }

            if (0 < tree.SetClauses.Count)
            {
                // values c1, c2, ...
                var first = true;
                commandText.AppendKeyword("values (");
                foreach (DbSetClause setClause in tree.SetClauses)
                {
                    if (first)
                    {
                        first = false;
                    }
                    else
                    {
                        commandText.Append(", ");
                    }
                    setClause.Value.Accept(translator);

                    translator.RegisterMemberValue(setClause.Property, setClause.Value);
                }
                commandText.AppendLine(")");
            }
            else
            {
                // default values
                commandText.AppendKeyword("default values");
                commandText.AppendLine();
            }

            if (generateReturningSql)
            {
                GenerateReturningSql(commandText, tree, tableType, translator, tree.Returning, useGeneratedValuesVariable);
            }

            parameters = translator.Parameters;

            return commandText.ToString();
        }
        internal static string GenerateDeleteSql(
            DbDeleteCommandTree tree,
            SqlGenerator sqlGenerator,
            out List<SqlParameter> parameters,
            bool upperCaseKeywords = true,
            bool createParameters = true)
        {
            var commandText
                = new SqlStringBuilder(CommandTextBuilderInitialCapacity)
                      {
                          UpperCaseKeywords = upperCaseKeywords
                      };

            var translator 
                = new ExpressionTranslator(
                    commandText, 
                    tree, 
                    false, 
                    sqlGenerator,
                    createParameters: createParameters);

            // delete [schemaName].[tableName]
            commandText.AppendKeyword("delete ");
            tree.Target.Expression.Accept(translator);
            commandText.AppendLine();

            // where c1 = ... AND c2 = ...
            commandText.AppendKeyword("where ");
            tree.Predicate.Accept(translator);

            parameters = translator.Parameters;
            return commandText.ToString();
        }
        private string IntroduceRequiredLocalVariables(EntityType entityType, DbInsertCommandTree commandTree)
        {
            DebugCheck.NotNull(entityType);
            DebugCheck.NotNull(commandTree);

            var storeGeneratedKeys
                = entityType
                    .KeyProperties
                    .Where(p => p.IsStoreGeneratedIdentity)
                    .ToList();

            var sql = new SqlStringBuilder { UpperCaseKeywords = true };

            if (storeGeneratedKeys.Any())
            {
                foreach (var keyProperty in storeGeneratedKeys)
                {
                    sql.Append(sql.Length == 0 ? "DECLARE " : ", ");
                    sql.Append("@");
                    sql.Append(keyProperty.Name);
                    sql.Append(" ");
                    sql.Append(DmlSqlGenerator.GetVariableType(_sqlGenerator, keyProperty));
                }

                sql.AppendLine();

                var translator
                    = new DmlSqlGenerator.ExpressionTranslator(
                        sql,
                        commandTree,
                        true,
                        _sqlGenerator,
                        entityType.KeyProperties);

                DmlSqlGenerator.GenerateReturningSql(
                    sql,
                    commandTree,
                    entityType,
                    translator,
                    commandTree.Returning,
                    DmlSqlGenerator.UseGeneratedValuesVariable(commandTree, _sqlGenerator.SqlVersion));

                sql.AppendLine();
                sql.AppendLine();
            }

            return sql.ToString();
        }