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JetProcessor.cs
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JetProcessor.cs
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#region License
//
// Copyright (c) 2018, Fluent Migrator Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#endregion
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.OleDb;
using System.Diagnostics;
using FluentMigrator.Expressions;
using FluentMigrator.Runner.Generators.Jet;
using FluentMigrator.Runner.Initialization;
using JetBrains.Annotations;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
namespace FluentMigrator.Runner.Processors.Jet
{
public class JetProcessor : ProcessorBase
{
private readonly Lazy<OleDbConnection> _connection;
private OleDbTransaction _transaction;
public OleDbConnection Connection => _connection.Value;
public OleDbTransaction Transaction => _transaction;
private bool _disposed = false;
[Obsolete]
public JetProcessor(IDbConnection connection, IMigrationGenerator generator, IAnnouncer announcer, IMigrationProcessorOptions options)
: base(generator, announcer, options)
{
_connection = new Lazy<OleDbConnection>(() => (OleDbConnection) connection);
// Prefetch connectionstring as after opening the security info could no longer be present
// for instance on sql server
ConnectionString = connection.ConnectionString;
}
public JetProcessor(
[NotNull] JetGenerator generator,
[NotNull] ILogger<JetProcessor> logger,
[NotNull] IOptionsSnapshot<ProcessorOptions> options,
[NotNull] IConnectionStringAccessor connectionStringAccessor)
: base(generator, logger, options.Value)
{
var factory = OleDbFactory.Instance;
var connectionString = connectionStringAccessor.ConnectionString ?? options.Value.ConnectionString;
if (factory != null)
{
_connection = new Lazy<OleDbConnection>(
() =>
{
var conn = (OleDbConnection) factory.CreateConnection();
Debug.Assert(conn != null, nameof(conn) + " != null");
conn.ConnectionString = connectionString;
return conn;
});
}
#pragma warning disable 612
ConnectionString = connectionString;
#pragma warning restore 612
}
[Obsolete]
public override string ConnectionString { get; }
public override string DatabaseType { get; } = ProcessorId.Jet;
public override IList<string> DatabaseTypeAliases { get; } = new List<string>();
protected void EnsureConnectionIsOpen()
{
if (Connection.State != ConnectionState.Open)
Connection.Open();
}
protected void EnsureConnectionIsClosed()
{
if (Connection.State != ConnectionState.Closed)
Connection.Close();
}
public override void Process(PerformDBOperationExpression expression)
{
Logger.LogSay("Performing DB Operation");
if (Options.PreviewOnly)
return;
EnsureConnectionIsOpen();
expression.Operation?.Invoke(Connection, _transaction);
}
protected override void Process(string sql)
{
Logger.LogSql(sql);
if (Options.PreviewOnly || string.IsNullOrEmpty(sql))
return;
EnsureConnectionIsOpen();
using (var command = new OleDbCommand(sql, Connection, Transaction))
{
try
{
command.ExecuteNonQuery();
}
catch (OleDbException ex)
{
throw new Exception(string.Format("Exception while processing \"{0}\"", sql), ex);
}
}
}
public override DataSet ReadTableData(string schemaName, string tableName)
{
return Read("SELECT * FROM [{0}]", tableName);
}
public override DataSet Read(string template, params object[] args)
{
EnsureConnectionIsOpen();
var ds = new DataSet();
using (var command = new OleDbCommand(string.Format(template, args), Connection, Transaction))
using (var adapter = new OleDbDataAdapter(command))
{
adapter.Fill(ds);
return ds;
}
}
public override bool Exists(string template, params object[] args)
{
EnsureConnectionIsOpen();
using (var command = new OleDbCommand(string.Format(template, args), Connection, Transaction))
using (var reader = command.ExecuteReader())
{
Debug.Assert(reader != null, nameof(reader) + " != null");
return reader.Read();
}
}
public override bool SequenceExists(string schemaName, string sequenceName)
{
return false;
}
public override void Execute(string template, params object[] args)
{
Process(string.Format(template, args));
}
public override bool SchemaExists(string tableName)
{
return true;
}
public override bool TableExists(string schemaName, string tableName)
{
EnsureConnectionIsOpen();
var restrict = new object[] { null, null, tableName, "TABLE" };
using (var tables = Connection.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, restrict))
{
Debug.Assert(tables != null, nameof(tables) + " != null");
for (int i = 0; i < tables.Rows.Count; i++)
{
var name = tables.Rows[i].ItemArray[2].ToString();
if (name == tableName)
{
return true;
}
}
return false;
}
}
public override bool ColumnExists(string schemaName, string tableName, string columnName)
{
EnsureConnectionIsOpen();
var restrict = new object[] { null, null, tableName, null };
using (var columns = Connection.GetOleDbSchemaTable(OleDbSchemaGuid.Columns, restrict))
{
Debug.Assert(columns != null, nameof(columns) + " != null");
for (int i = 0; i < columns.Rows.Count; i++)
{
var name = columns.Rows[i].ItemArray[3].ToString();
if (name == columnName)
{
return true;
}
}
return false;
}
}
public override bool ConstraintExists(string schemaName, string tableName, string constraintName)
{
EnsureConnectionIsOpen();
var restrict = new object[] { null, null, constraintName, null, null, tableName };
using (var constraints = Connection.GetOleDbSchemaTable(OleDbSchemaGuid.Table_Constraints, restrict))
{
Debug.Assert(constraints != null, nameof(constraints) + " != null");
return constraints.Rows.Count > 0;
}
}
public override bool IndexExists(string schemaName, string tableName, string indexName)
{
EnsureConnectionIsOpen();
var restrict = new object[] { null, null, indexName, null, tableName };
using (var indexes = Connection.GetOleDbSchemaTable(OleDbSchemaGuid.Indexes, restrict))
{
Debug.Assert(indexes != null, nameof(indexes) + " != null");
return indexes.Rows.Count > 0;
}
}
public override bool DefaultValueExists(string schemaName, string tableName, string columnName, object defaultValue)
{
return false;
}
public override void BeginTransaction()
{
if (_transaction != null) return;
EnsureConnectionIsOpen();
Logger.LogSay("Beginning Transaction");
_transaction = Connection.BeginTransaction();
}
public override void RollbackTransaction()
{
if (_transaction == null) return;
Logger.LogSay("Rolling back transaction");
_transaction.Rollback();
WasCommitted = true;
_transaction = null;
}
public override void CommitTransaction()
{
if (_transaction == null) return;
Logger.LogSay("Committing Transaction");
_transaction.Commit();
WasCommitted = true;
_transaction = null;
}
protected override void Dispose(bool isDisposing)
{
if (!isDisposing || _disposed)
return;
_disposed = true;
RollbackTransaction();
EnsureConnectionIsClosed();
}
}
}