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Db2Processor.cs
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Db2Processor.cs
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#region License
//
// Copyright (c) 2007-2024, 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 FluentMigrator.Expressions;
using FluentMigrator.Runner.Generators;
using FluentMigrator.Runner.Generators.DB2;
using FluentMigrator.Runner.Helpers;
using FluentMigrator.Runner.Initialization;
using JetBrains.Annotations;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
namespace FluentMigrator.Runner.Processors.DB2
{
public class Db2Processor : GenericProcessorBase
{
[Obsolete]
public Db2Processor(IDbConnection connection, IMigrationGenerator generator, IAnnouncer announcer, IMigrationProcessorOptions options, IDbFactory factory)
: base(connection, factory, generator, announcer, options)
{
Quoter = new Db2Quoter();
}
public Db2Processor(
[NotNull] Db2DbFactory factory,
[NotNull] Db2Generator generator,
[NotNull] Db2Quoter quoter,
[NotNull] ILogger<Db2Processor> logger,
[NotNull] IOptionsSnapshot<ProcessorOptions> options,
[NotNull] IConnectionStringAccessor connectionStringAccessor)
: base(() => factory.Factory, generator, logger, options.Value, connectionStringAccessor)
{
Quoter = quoter;
}
public override string DatabaseType => ProcessorId.DB2;
public override IList<string> DatabaseTypeAliases { get; } = new List<string> { "IBM DB2" };
public IQuoter Quoter
{
get;
set;
}
public override bool ColumnExists(string schemaName, string tableName, string columnName)
{
var conditions = new List<string>
{
BuildEqualityComparison("TABNAME", tableName),
BuildEqualityComparison("COLNAME", columnName),
};
if (!string.IsNullOrEmpty(schemaName))
conditions.Add(BuildEqualityComparison("TABSCHEMA", schemaName));
var condition = string.Join(" AND ", conditions);
var doesExist = Exists("SELECT COLNAME FROM SYSCAT.COLUMNS WHERE {0}", condition);
return doesExist;
}
public override bool ConstraintExists(string schemaName, string tableName, string constraintName)
{
var conditions = new List<string>
{
BuildEqualityComparison("TABNAME", tableName),
BuildEqualityComparison("CONSTNAME", constraintName),
};
if (!string.IsNullOrEmpty(schemaName))
conditions.Add(BuildEqualityComparison("TABSCHEMA", schemaName));
var condition = string.Join(" AND ", conditions);
return Exists("SELECT CONSTNAME FROM SYSCAT.TABCONST WHERE {0}", condition);
}
public override bool DefaultValueExists(string schemaName, string tableName, string columnName, object defaultValue)
{
var defaultValueAsString = string.Format("%{0}%", FormatHelper.FormatSqlEscape(defaultValue.ToString()));
var conditions = new List<string>
{
BuildEqualityComparison("TABNAME", tableName),
BuildEqualityComparison("COLNAME", columnName),
$"\"DEFAULT\" LIKE '{defaultValueAsString}'",
};
if (!string.IsNullOrEmpty(schemaName))
conditions.Add(BuildEqualityComparison("TABSCHEMA", schemaName));
var condition = string.Join(" AND ", conditions);
return Exists("SELECT \"DEFAULT\" FROM SYSCAT.COLUMNS WHERE {0}", condition);
}
public override void Execute(string template, params object[] args)
{
Process(string.Format(template, args));
}
public override bool Exists(string template, params object[] args)
{
EnsureConnectionIsOpen();
using (var command = CreateCommand(string.Format(template, args)))
using (var reader = command.ExecuteReader())
{
return reader.Read();
}
}
public override bool IndexExists(string schemaName, string tableName, string indexName)
{
var conditions = new List<string>
{
BuildEqualityComparison("TABNAME", tableName),
BuildEqualityComparison("INDNAME", indexName),
};
if (!string.IsNullOrEmpty(schemaName))
conditions.Add(BuildEqualityComparison("INDSCHEMA", schemaName));
var condition = string.Join(" AND ", conditions);
var doesExist = Exists("SELECT INDNAME FROM SYSCAT.INDEXES WHERE {0}", condition);
return doesExist;
}
public override void Process(PerformDBOperationExpression expression)
{
Logger.LogSay("Performing DB Operation");
if (Options.PreviewOnly)
{
return;
}
EnsureConnectionIsOpen();
expression.Operation?.Invoke(Connection, Transaction);
}
public override DataSet Read(string template, params object[] args)
{
EnsureConnectionIsOpen();
using (var command = CreateCommand(string.Format(template, args)))
using (var reader = command.ExecuteReader())
{
return reader.ReadDataSet();
}
}
public override DataSet ReadTableData(string schemaName, string tableName)
{
return Read("SELECT * FROM {0}", Quoter.QuoteTableName(tableName, schemaName));
}
public override bool SchemaExists(string schemaName)
{
var conditions = new List<string>
{
BuildEqualityComparison("SCHEMANAME", schemaName),
};
var condition = string.Join(" AND ", conditions);
return Exists("SELECT SCHEMANAME FROM SYSCAT.SCHEMATA WHERE {0}", condition);
}
public override bool SequenceExists(string schemaName, string sequenceName)
{
return false;
}
public override bool TableExists(string schemaName, string tableName)
{
var conditions = new List<string>
{
BuildEqualityComparison("TABNAME", tableName),
};
if (!string.IsNullOrEmpty(schemaName))
conditions.Add(BuildEqualityComparison("TABSCHEMA", schemaName));
var condition = string.Join(" AND ", conditions);
return Exists("SELECT TABNAME FROM SYSCAT.TABLES WHERE {0}", condition);
}
protected override void Process(string sql)
{
Logger.LogSql(sql);
if (Options.PreviewOnly || string.IsNullOrEmpty(sql))
{
return;
}
EnsureConnectionIsOpen();
using (var command = CreateCommand(sql))
{
command.ExecuteNonQuery();
}
}
private string BuildEqualityComparison(string columnName, string value)
{
if (Quoter.IsQuoted(value))
{
return $"{Quoter.QuoteColumnName(columnName)}='{FormatHelper.FormatSqlEscape(Quoter.UnQuote(value))}'";
}
return $"LCASE({Quoter.QuoteColumnName(columnName)})=LCASE('{FormatHelper.FormatSqlEscape(Quoter.UnQuote(value))}')";
}
}
}