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using System;
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using System.Collections.Generic;
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using System.Data.SQLite;
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using System.Linq;
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using System.Text.RegularExpressions;
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using NLog;
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namespace NzbDrone.Core.Datastore.Migration.Framework
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{
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public interface ISQLiteMigrationHelper
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{
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Dictionary<String, SQLiteMigrationHelper.SQLiteColumn> GetColumns(string tableName);
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void CreateTable(string tableName, IEnumerable<SQLiteMigrationHelper.SQLiteColumn> values, IEnumerable<SQLiteMigrationHelper.SQLiteIndex> indexes);
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void CopyData(string sourceTable, string destinationTable, IEnumerable<SQLiteMigrationHelper.SQLiteColumn> columns);
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void DropTable(string tableName);
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void RenameTable(string tableName, string newName);
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List<T> GetDuplicates<T>(string tableName, string columnName);
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SQLiteTransaction BeginTransaction();
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List<SQLiteMigrationHelper.SQLiteIndex> GetIndexes(string tableName);
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}
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public class SQLiteMigrationHelper : ISQLiteMigrationHelper
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{
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private readonly SQLiteConnection _connection;
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private static readonly Regex SchemaRegex = new Regex(@"['\""\[](?<name>\w+)['\""\]]\s(?<schema>[\w-\s]+)",
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RegexOptions.Compiled | RegexOptions.IgnoreCase | RegexOptions.Multiline);
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private static readonly Regex IndexRegex = new Regex(@"\(""(?<col>.*)""\s(?<direction>ASC|DESC)\)$",
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RegexOptions.Compiled | RegexOptions.IgnoreCase | RegexOptions.Multiline);
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public SQLiteMigrationHelper(IConnectionStringFactory connectionStringFactory, Logger logger)
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{
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try
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{
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_connection = new SQLiteConnection(connectionStringFactory.MainDbConnectionString);
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_connection.Open();
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}
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catch (Exception e)
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{
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logger.ErrorException("Couldn't open database " + connectionStringFactory.MainDbConnectionString, e);
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throw;
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}
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}
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private string GetOriginalSql(string tableName)
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{
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var command =
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new SQLiteCommand(string.Format("SELECT sql FROM sqlite_master WHERE type='table' AND name ='{0}'",
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tableName));
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command.Connection = _connection;
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return (string)command.ExecuteScalar();
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}
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public Dictionary<String, SQLiteColumn> GetColumns(string tableName)
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{
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var originalSql = GetOriginalSql(tableName);
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var matches = SchemaRegex.Matches(originalSql);
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return matches.Cast<Match>().ToDictionary(
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match => match.Groups["name"].Value.Trim(),
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match => new SQLiteColumn
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{
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Name = match.Groups["name"].Value.Trim(),
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Schema = match.Groups["schema"].Value.Trim()
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});
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}
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private static IEnumerable<T> ReadArray<T>(SQLiteDataReader reader)
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{
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while (reader.Read())
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{
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yield return (T)Convert.ChangeType(reader[0], typeof(T));
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}
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}
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public List<SQLiteIndex> GetIndexes(string tableName)
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{
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var command = new SQLiteCommand(string.Format("SELECT sql FROM sqlite_master WHERE type='index' AND tbl_name ='{0}'", tableName));
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command.Connection = _connection;
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var reader = command.ExecuteReader();
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var sqls = ReadArray<string>(reader).ToList();
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var indexes = new List<SQLiteIndex>();
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foreach (var indexSql in sqls)
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{
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var newIndex = new SQLiteIndex();
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var matches = IndexRegex.Match(indexSql);
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newIndex.Column = matches.Groups["col"].Value;
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newIndex.Unique = indexSql.Contains("UNIQUE");
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newIndex.Table = tableName;
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indexes.Add(newIndex);
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}
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return indexes;
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}
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public void CreateTable(string tableName, IEnumerable<SQLiteColumn> values, IEnumerable<SQLiteIndex> indexes)
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{
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var columns = String.Join(",", values.Select(c => c.ToString()));
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ExecuteNonQuery("CREATE TABLE [{0}] ({1})", tableName, columns);
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foreach (var index in indexes)
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{
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ExecuteNonQuery("DROP INDEX {0}", index.IndexName);
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ExecuteNonQuery(index.CreateSql(tableName));
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}
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}
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public void CopyData(string sourceTable, string destinationTable, IEnumerable<SQLiteColumn> columns)
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{
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var originalCount = GetRowCount(sourceTable);
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var columnsToTransfer = String.Join(",", columns.Select(c => c.Name));
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var transferCommand = BuildCommand("INSERT INTO {0} SELECT {1} FROM {2};", destinationTable, columnsToTransfer, sourceTable);
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transferCommand.ExecuteNonQuery();
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var transferredRows = GetRowCount(destinationTable);
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if (transferredRows != originalCount)
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{
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throw new ApplicationException(string.Format("Expected {0} rows to be copied from [{1}] to [{2}]. But only copied {3}", originalCount, sourceTable, destinationTable, transferredRows));
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}
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}
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public void DropTable(string tableName)
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{
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var dropCommand = BuildCommand("DROP TABLE {0};", tableName);
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dropCommand.ExecuteNonQuery();
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}
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public void RenameTable(string tableName, string newName)
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{
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var renameCommand = BuildCommand("ALTER TABLE {0} RENAME TO {1};", tableName, newName);
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renameCommand.ExecuteNonQuery();
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}
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public Dictionary<int,T> GetDuplicates<T>(string tableName, string columnName)
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{
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var dupCommand = BuildCommand("select id, {0} from {1}", columnName, tableName);
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var result = new Dictionary<int, T>();
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using (var reader = dupCommand.ExecuteReader())
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{
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while (reader.Read())
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{
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}
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}
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return ReadArray<T>().ToList();
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}
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public int GetRowCount(string tableName)
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{
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var countCommand = BuildCommand("SELECT COUNT(*) FROM {0};", tableName);
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return Convert.ToInt32(countCommand.ExecuteScalar());
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}
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public SQLiteTransaction BeginTransaction()
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{
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return _connection.BeginTransaction();
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}
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private SQLiteCommand BuildCommand(string format, params string[] args)
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{
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var command = new SQLiteCommand(string.Format(format, args));
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command.Connection = _connection;
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return command;
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}
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private void ExecuteNonQuery(string command, params string[] args)
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{
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var sqLiteCommand = new SQLiteCommand(string.Format(command, args))
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{
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Connection = _connection
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};
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sqLiteCommand.ExecuteNonQuery();
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}
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public class SQLiteColumn
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{
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public string Name { get; set; }
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public string Schema { get; set; }
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public override string ToString()
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{
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return string.Format("[{0}] {1}", Name, Schema);
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}
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}
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public class SQLiteIndex
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{
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public string Column { get; set; }
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public string Table { get; set; }
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public bool Unique { get; set; }
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public override string ToString()
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{
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return string.Format("[{0}] Unique: {1}", Column, Unique);
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}
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public string IndexName
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{
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get
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{
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return string.Format("IX_{0}_{1}", Table, Column);
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}
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}
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public string CreateSql(string tableName)
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{
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return string.Format(@"CREATE UNIQUE INDEX ""{2}"" ON ""{0}"" (""{1}"" ASC)", tableName, Column, IndexName);
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}
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}
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}
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}
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Keivan Beigi
11 years ago