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NpgsqlSqlGenerator.cs
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// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using JetBrains.Annotations;
using Microsoft.Data.Entity.Relational;
using Microsoft.Data.Entity.Relational.Update;
using Microsoft.Data.Entity.Utilities;
namespace Npgsql.EntityFramework7
{
public class NpgsqlSqlGenerator : SqlGenerator, INpgsqlSqlGenerator
{
public override void AppendInsertOperation(
StringBuilder commandStringBuilder,
ModificationCommand command)
{
Check.NotNull(command, nameof(command));
AppendBulkInsertOperation(commandStringBuilder, new[] { command });
}
public virtual ResultsGrouping AppendBulkInsertOperation(
StringBuilder commandStringBuilder,
IReadOnlyList<ModificationCommand> modificationCommands)
{
Check.NotNull(commandStringBuilder, nameof(commandStringBuilder));
Check.NotEmpty(modificationCommands, nameof(modificationCommands));
var tableName = modificationCommands[0].TableName;
var schemaName = modificationCommands[0].SchemaName;
// TODO: Support TPH
var defaultValuesOnly = !modificationCommands.First().ColumnModifications.Any(o => o.IsWrite);
var statementCount = defaultValuesOnly
? modificationCommands.Count
: 1;
var valueSetCount = defaultValuesOnly
? 1
: modificationCommands.Count;
for (var i = 0; i < statementCount; i++)
{
var operations = modificationCommands[i].ColumnModifications;
var writeOperations = operations.Where(o => o.IsWrite).ToArray();
var readOperations = operations.Where(o => o.IsRead).ToArray();
AppendInsertCommandHeader(commandStringBuilder, tableName, schemaName, writeOperations);
if (readOperations.Length > 0)
{
AppendOutputClause(commandStringBuilder, readOperations);
}
AppendValuesHeader(commandStringBuilder, writeOperations);
AppendValues(commandStringBuilder, writeOperations);
for (var j = 1; j < valueSetCount; j++)
{
commandStringBuilder.Append(",").AppendLine();
AppendValues(commandStringBuilder, modificationCommands[j].ColumnModifications.Where(o => o.IsWrite).ToArray());
}
commandStringBuilder.Append(BatchCommandSeparator).AppendLine();
/*
if (readOperations.Length == 0)
{
AppendSelectAffectedCountCommand(commandStringBuilder, tableName, schemaName);
}*/
}
return defaultValuesOnly
? ResultsGrouping.OneCommandPerResultSet
: ResultsGrouping.OneResultSet;
}
public override void AppendUpdateOperation(
StringBuilder commandStringBuilder,
ModificationCommand command)
{
Check.NotNull(commandStringBuilder, nameof(commandStringBuilder));
Check.NotNull(command, nameof(command));
var tableName = command.TableName;
var schemaName = command.SchemaName;
var operations = command.ColumnModifications;
var writeOperations = operations.Where(o => o.IsWrite).ToArray();
var conditionOperations = operations.Where(o => o.IsCondition).ToArray();
var readOperations = operations.Where(o => o.IsRead).ToArray();
AppendUpdateCommandHeader(commandStringBuilder, tableName, schemaName, writeOperations);
if (readOperations.Length > 0)
{
AppendOutputClause(commandStringBuilder, readOperations);
}
AppendWhereClause(commandStringBuilder, conditionOperations);
commandStringBuilder.Append(BatchCommandSeparator).AppendLine();
/*
if (readOperations.Length == 0)
{
AppendSelectAffectedCountCommand(commandStringBuilder, tableName, schemaName);
}*/
}
// ReSharper disable once ParameterTypeCanBeEnumerable.Local
private void AppendOutputClause(
StringBuilder commandStringBuilder,
IReadOnlyList<ColumnModification> operations)
{
commandStringBuilder
.AppendLine()
.Append("OUTPUT ")
.AppendJoin(operations.Select(c => "INSERTED." + DelimitIdentifier(c.ColumnName)));
}
public override void AppendSelectAffectedCountCommand(StringBuilder commandStringBuilder, string tableName, string schemaName)
{
/*
Check.NotNull(commandStringBuilder, nameof(commandStringBuilder));
Check.NotEmpty(tableName, nameof(tableName));
commandStringBuilder
.Append("SELECT @@ROWCOUNT")
.Append(BatchCommandSeparator).AppendLine();
*/
}
public override void AppendBatchHeader(StringBuilder commandStringBuilder)
{
Check.NotNull(commandStringBuilder, nameof(commandStringBuilder));
// TODO: Npgsql
}
protected override void AppendIdentityWhereCondition(StringBuilder commandStringBuilder, ColumnModification columnModification)
{
commandStringBuilder
.Append(DelimitIdentifier(columnModification.ColumnName))
.Append(" = ")
.Append("scope_identity()");
}
protected override void AppendRowsAffectedWhereCondition(StringBuilder commandStringBuilder, int expectedRowsAffected)
{
Check.NotNull(commandStringBuilder, nameof(commandStringBuilder));
commandStringBuilder
.Append("@@ROWCOUNT = " + expectedRowsAffected);
}
public override string BatchSeparator => "GO";
public override string DelimitIdentifier(string identifier)
{
Check.NotEmpty(identifier, nameof(identifier));
return '"' + EscapeIdentifier(identifier) + '"';
}
public override string EscapeIdentifier(string identifier)
{
Check.NotEmpty(identifier, nameof(identifier));
return identifier.Replace("\"", "\"\"");
}
public override string GenerateLiteral(byte[] literal)
{
Check.NotNull(literal, nameof(literal));
var builder = new StringBuilder();
builder.Append("0x");
var parts = literal.Select(b => b.ToString("X2", CultureInfo.InvariantCulture));
foreach (var part in parts)
{
builder.Append(part);
}
return builder.ToString();
}
public override string GenerateLiteral(bool literal) => literal ? "1" : "0";
public override string GenerateLiteral(DateTime literal) => "'" + literal.ToString(@"yyyy-MM-dd HH\:mm\:ss.fffffff") + "'";
public override string GenerateLiteral(DateTimeOffset literal) => "'" + literal.ToString(@"yyyy-MM-dd HH\:mm\:ss.fffffffzzz") + "'";
public virtual string GenerateLiteral(Guid literal) => "'" + literal + "'";
public enum ResultsGrouping
{
OneResultSet,
OneCommandPerResultSet
}
#region Npsql-specific
public override string GenerateNextSequenceValueOperation(string sequenceName)
{
Check.NotNull(sequenceName, nameof(sequenceName));
//TODO:Verify implementation
//split string using '.' to extract schema and name parts
var parts = sequenceName.Split(new char[] {'.'});
//TODO: should we throw exceptions if parts is empty or has more than 2 components?
//synthesize the sequence name
//The name itself must be delimited, but the schema should not
var actualSequenceName = (parts.Length == 1) ? DelimitIdentifier(parts[0]) : $"{parts[0]}.{DelimitIdentifier(parts[1])}";
return string.Format("SELECT nextval('{0}')", actualSequenceName);
}
#endregion
}
}