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GeezerVison is showing github.com — Npgsql/src/Npgsql/NpgsqlDatabaseInfo.cs at main · roji/Npgsql Expand file tree/ Copy pathNpgsqlDatabaseInfo.csMore file actions 261 lines (227 loc) · 9.75 KB / Copy pathNpgsqlDatabaseInfo.csFile metadata and controls261 lines (227 loc) · 9.75 KB 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 using System; using System.Collections.Concurrent; using System.Collections.Generic; using System.Threading.Tasks; using Npgsql.PostgresTypes; using Npgsql.Util; namespace Npgsql { /// <summary> /// Base class for implementations which provide information about PostgreSQL and PostgreSQL-like databases /// (e.g. type definitions, capabilities...). /// </summary> public abstract class NpgsqlDatabaseInfo { #region Fields internal static readonly ConcurrentDictionary<NpgsqlDatabaseInfoCacheKey, NpgsqlDatabaseInfo> Cache = new(); static volatile INpgsqlDatabaseInfoFactory[] Factories = new INpgsqlDatabaseInfoFactory[] { new PostgresMinimalDatabaseInfoFactory(), new PostgresDatabaseInfoFactory() }; #endregion Fields #region General database info /// <summary> /// The hostname of IP address of the database. /// </summary> public string Host { get; } /// <summary> /// The TCP port of the database. /// </summary> public int Port { get; } /// <summary> /// The database name. /// </summary> public string Name { get; } /// <summary> /// The version of the PostgreSQL database we're connected to, as reported in the "server_version" parameter. /// Exposed via <see cref="NpgsqlConnection.PostgreSqlVersion"/>. /// </summary> public Version Version { get; } #endregion General database info #region Supported capabilities and features /// <summary> /// Whether the backend supports range types. /// </summary> public virtual bool SupportsRangeTypes => Version.IsGreaterOrEqual(9, 2, 0); /// <summary> /// Whether the backend supports enum types. /// </summary> public virtual bool SupportsEnumTypes => Version.IsGreaterOrEqual(8, 3, 0); /// <summary> /// Whether the backend supports the CLOSE ALL statement. /// </summary> public virtual bool SupportsCloseAll => Version.IsGreaterOrEqual(8, 3, 0); /// <summary> /// Whether the backend supports advisory locks. /// </summary> public virtual bool SupportsAdvisoryLocks => Version.IsGreaterOrEqual(8, 2, 0); /// <summary> /// Whether the backend supports the DISCARD SEQUENCES statement. /// </summary> public virtual bool SupportsDiscardSequences => Version.IsGreaterOrEqual(9, 4, 0); /// <summary> /// Whether the backend supports the UNLISTEN statement. /// </summary> public virtual bool SupportsUnlisten => Version.IsGreaterOrEqual(6, 4, 0); // overridden by PostgresDatabase /// <summary> /// Whether the backend supports the DISCARD TEMP statement. /// </summary> public virtual bool SupportsDiscardTemp => Version.IsGreaterOrEqual(8, 3, 0); /// <summary> /// Whether the backend supports the DISCARD statement. /// </summary> public virtual bool SupportsDiscard => Version.IsGreaterOrEqual(8, 3, 0); /// <summary> /// Reports whether the backend uses the newer integer timestamp representation. /// </summary> public virtual bool HasIntegerDateTimes { get; protected set; } = true; /// <summary> /// Whether the database supports transactions. /// </summary> public virtual bool SupportsTransactions { get; protected set; } = true; #endregion Supported capabilities and features #region Types readonly List<PostgresBaseType> _baseTypesMutable = new(); readonly List<PostgresArrayType> _arrayTypesMutable = new(); readonly List<PostgresRangeType> _rangeTypesMutable = new(); readonly List<PostgresEnumType> _enumTypesMutable = new(); readonly List<PostgresCompositeType> _compositeTypesMutable = new(); readonly List<PostgresDomainType> _domainTypesMutable = new(); internal IReadOnlyList<PostgresBaseType> BaseTypes => _baseTypesMutable; internal IReadOnlyList<PostgresArrayType> ArrayTypes => _arrayTypesMutable; internal IReadOnlyList<PostgresRangeType> RangeTypes => _rangeTypesMutable; internal IReadOnlyList<PostgresEnumType> EnumTypes => _enumTypesMutable; internal IReadOnlyList<PostgresCompositeType> CompositeTypes => _compositeTypesMutable; internal IReadOnlyList<PostgresDomainType> DomainTypes => _domainTypesMutable; /// <summary> /// Indexes backend types by their type OID. /// </summary> internal Dictionary<uint, PostgresType> ByOID { get; } = new(); /// <summary> /// Indexes backend types by their PostgreSQL name, including namespace (e.g. pg_catalog.int4). /// Only used for enums and composites. /// </summary> internal Dictionary<string, PostgresType> ByFullName { get; } = new(); /// <summary> /// Indexes backend types by their PostgreSQL name, not including namespace. /// If more than one type exists with the same name (i.e. in different namespaces) this /// table will contain an entry with a null value. /// Only used for enums and composites. /// </summary> internal Dictionary<string, PostgresType?> ByName { get; } = new(); /// <summary> /// Initializes the instance of <see cref="NpgsqlDatabaseInfo"/>. /// </summary> protected NpgsqlDatabaseInfo(string host, int port, string databaseName, Version version) { Host = host; Port = port; Name = databaseName; Version = version; } internal void ProcessTypes() { foreach (var type in GetTypes()) { ByOID[type.OID] = type; ByFullName[type.FullName] = type; // If more than one type exists with the same partial name, we place a null value. // This allows us to detect this case later and force the user to use full names only. ByName[type.Name] = ByName.ContainsKey(type.Name) ? null : type; switch (type) { case PostgresBaseType baseType: _baseTypesMutable.Add(baseType); continue; case PostgresArrayType arrayType: _arrayTypesMutable.Add(arrayType); continue; case PostgresRangeType rangeType: _rangeTypesMutable.Add(rangeType); continue; case PostgresEnumType enumType: _enumTypesMutable.Add(enumType); continue; case PostgresCompositeType compositeType: _compositeTypesMutable.Add(compositeType); continue; case PostgresDomainType domainType: _domainTypesMutable.Add(domainType); continue; default: throw new ArgumentOutOfRangeException(); } } } /// <summary> /// Provides all PostgreSQL types detected in this database. /// </summary> /// <returns></returns> protected abstract IEnumerable<PostgresType> GetTypes(); #endregion Types #region Misc /// <summary> /// Parses a PostgreSQL server version (e.g. 10.1, 9.6.3) and returns a CLR Version. /// </summary> protected static Version ParseServerVersion(string value) { var versionString = value.Trim(); for (var idx = 0; idx != versionString.Length; ++idx) { var c = value[idx]; if (!char.IsDigit(c) && c != '.') { versionString = versionString.Substring(0, idx); break; } } if (!versionString.Contains(".")) versionString += ".0"; return new Version(versionString); } #endregion Misc #region Factory management /// <summary> /// Registers a new database info factory, which is used to load information about databases. /// </summary> public static void RegisterFactory(INpgsqlDatabaseInfoFactory factory) { if (factory == null) throw new ArgumentNullException(nameof(factory)); var factories = new INpgsqlDatabaseInfoFactory[Factories.Length + 1]; factories[0] = factory; Array.Copy(Factories, 0, factories, 1, Factories.Length); Factories = factories; Cache.Clear(); } internal static async Task<NpgsqlDatabaseInfo> Load(NpgsqlConnection conn, NpgsqlTimeout timeout, bool async) { foreach (var factory in Factories) { var dbInfo = await factory.Load(conn, timeout, async); if (dbInfo != null) { dbInfo.ProcessTypes(); return dbInfo; } } // Should never be here throw new NpgsqlException("No DatabaseInfoFactory could be found for this connection"); } // For tests internal static void ResetFactories() { Factories = new INpgsqlDatabaseInfoFactory[] { new PostgresMinimalDatabaseInfoFactory(), new PostgresDatabaseInfoFactory() }; Cache.Clear(); } #endregion Factory management } } |
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