src/Pure/General/sql.scala
author wenzelm
Mon May 01 15:42:26 2017 +0200 (2017-05-01)
changeset 65668 366bc4e6a238
parent 65649 0818da4f67bb
child 65669 d2f19b4a16ae
permissions -rw-r--r--
more operations;
tuned;
wenzelm@63788
     1
/*  Title:      Pure/General/sql.scala
wenzelm@63778
     2
    Author:     Makarius
wenzelm@63778
     3
wenzelm@65006
     4
Support for SQL databases: SQLite and PostgreSQL.
wenzelm@63778
     5
*/
wenzelm@63778
     6
wenzelm@63778
     7
package isabelle
wenzelm@63778
     8
wenzelm@65021
     9
import java.time.OffsetDateTime
wenzelm@65021
    10
import java.sql.{DriverManager, Connection, PreparedStatement, ResultSet}
wenzelm@63779
    11
wenzelm@63779
    12
wenzelm@63778
    13
object SQL
wenzelm@63778
    14
{
wenzelm@65006
    15
  /** SQL language **/
wenzelm@65006
    16
wenzelm@63778
    17
  /* concrete syntax */
wenzelm@63778
    18
wenzelm@65321
    19
  def escape_char(c: Char): String =
wenzelm@63778
    20
    c match {
wenzelm@63778
    21
      case '\u0000' => "\\0"
wenzelm@63778
    22
      case '\'' => "\\'"
wenzelm@63778
    23
      case '\"' => "\\\""
wenzelm@63778
    24
      case '\b' => "\\b"
wenzelm@63778
    25
      case '\n' => "\\n"
wenzelm@63778
    26
      case '\r' => "\\r"
wenzelm@63778
    27
      case '\t' => "\\t"
wenzelm@63778
    28
      case '\u001a' => "\\Z"
wenzelm@63778
    29
      case '\\' => "\\\\"
wenzelm@63778
    30
      case _ => c.toString
wenzelm@63778
    31
    }
wenzelm@63778
    32
wenzelm@65648
    33
  def string(s: String): String =
wenzelm@65321
    34
    "'" + s.map(escape_char(_)).mkString + "'"
wenzelm@63778
    35
wenzelm@65648
    36
  def ident(s: String): String =
wenzelm@65644
    37
    if (Long_Name.is_qualified(s)) s
wenzelm@65644
    38
    else quote(s.replace("\"", "\"\""))
wenzelm@63779
    39
wenzelm@65668
    40
  def enclose(s: String): String = "(" + s + ")"
wenzelm@63791
    41
  def enclosure(ss: Iterable[String]): String = ss.mkString("(", ", ", ")")
wenzelm@63791
    42
wenzelm@65644
    43
  def select(columns: List[Column], distinct: Boolean = false): String =
wenzelm@65649
    44
    "SELECT " + (if (distinct) "DISTINCT " else "") + commas(columns.map(_.sql)) + " FROM "
wenzelm@65644
    45
wenzelm@65668
    46
  def join(table1: Table, table2: Table, sql: String = "", outer: Boolean = false): String =
wenzelm@65668
    47
    table1.sql + (if (outer) " LEFT OUTER JOIN " else " INNER JOIN ") + table2.sql +
wenzelm@65668
    48
      (if (sql == "") "" else " ON " + sql)
wenzelm@65668
    49
wenzelm@65668
    50
  def join_outer(table1: Table, table2: Table, sql: String = ""): String =
wenzelm@65668
    51
    join(table1, table2, sql, outer = true)
wenzelm@65668
    52
wenzelm@63779
    53
wenzelm@65008
    54
  /* types */
wenzelm@65008
    55
wenzelm@65008
    56
  object Type extends Enumeration
wenzelm@65008
    57
  {
wenzelm@65011
    58
    val Boolean = Value("BOOLEAN")
wenzelm@65008
    59
    val Int = Value("INTEGER")
wenzelm@65008
    60
    val Long = Value("BIGINT")
wenzelm@65008
    61
    val Double = Value("DOUBLE PRECISION")
wenzelm@65008
    62
    val String = Value("TEXT")
wenzelm@65008
    63
    val Bytes = Value("BLOB")
wenzelm@65014
    64
    val Date = Value("TIMESTAMP WITH TIME ZONE")
wenzelm@65008
    65
  }
wenzelm@65008
    66
wenzelm@65019
    67
  def sql_type_default(T: Type.Value): String = T.toString
wenzelm@65013
    68
wenzelm@65019
    69
  def sql_type_sqlite(T: Type.Value): String =
wenzelm@65019
    70
    if (T == Type.Boolean) "INTEGER"
wenzelm@65019
    71
    else if (T == Type.Date) "TEXT"
wenzelm@65019
    72
    else sql_type_default(T)
wenzelm@65013
    73
wenzelm@65019
    74
  def sql_type_postgresql(T: Type.Value): String =
wenzelm@65019
    75
    if (T == Type.Bytes) "BYTEA"
wenzelm@65019
    76
    else sql_type_default(T)
wenzelm@65008
    77
wenzelm@65008
    78
wenzelm@63779
    79
  /* columns */
wenzelm@63779
    80
wenzelm@63779
    81
  object Column
wenzelm@63779
    82
  {
wenzelm@65280
    83
    def bool(name: String, strict: Boolean = false, primary_key: Boolean = false): Column =
wenzelm@65018
    84
      Column(name, Type.Boolean, strict, primary_key)
wenzelm@65280
    85
    def int(name: String, strict: Boolean = false, primary_key: Boolean = false): Column =
wenzelm@65018
    86
      Column(name, Type.Int, strict, primary_key)
wenzelm@65280
    87
    def long(name: String, strict: Boolean = false, primary_key: Boolean = false): Column =
wenzelm@65018
    88
      Column(name, Type.Long, strict, primary_key)
wenzelm@65280
    89
    def double(name: String, strict: Boolean = false, primary_key: Boolean = false): Column =
wenzelm@65018
    90
      Column(name, Type.Double, strict, primary_key)
wenzelm@65280
    91
    def string(name: String, strict: Boolean = false, primary_key: Boolean = false): Column =
wenzelm@65018
    92
      Column(name, Type.String, strict, primary_key)
wenzelm@65280
    93
    def bytes(name: String, strict: Boolean = false, primary_key: Boolean = false): Column =
wenzelm@65018
    94
      Column(name, Type.Bytes, strict, primary_key)
wenzelm@65280
    95
    def date(name: String, strict: Boolean = false, primary_key: Boolean = false): Column =
wenzelm@65018
    96
      Column(name, Type.Date, strict, primary_key)
wenzelm@63779
    97
  }
wenzelm@63779
    98
wenzelm@65018
    99
  sealed case class Column(
wenzelm@65280
   100
    name: String, T: Type.Value, strict: Boolean = false, primary_key: Boolean = false)
wenzelm@63779
   101
  {
wenzelm@65644
   102
    def apply(table: Table): Column =
wenzelm@65644
   103
      Column(Long_Name.qualify(table.name, name), T, strict = strict, primary_key = primary_key)
wenzelm@65644
   104
wenzelm@65649
   105
    def sql: String = ident(name)
wenzelm@65019
   106
    def sql_decl(sql_type: Type.Value => String): String =
wenzelm@65649
   107
      sql + " " + sql_type(T) + (if (strict || primary_key) " NOT NULL" else "")
wenzelm@63781
   108
wenzelm@65649
   109
    def sql_where_eq: String = "WHERE " + sql + " = "
wenzelm@65648
   110
    def sql_where_equal(s: String): String = sql_where_eq + string(s)
wenzelm@65593
   111
wenzelm@65019
   112
    override def toString: String = sql_decl(sql_type_default)
wenzelm@63779
   113
  }
wenzelm@63779
   114
wenzelm@63780
   115
wenzelm@63780
   116
  /* tables */
wenzelm@63780
   117
wenzelm@65018
   118
  sealed case class Table(name: String, columns: List[Column])
wenzelm@63780
   119
  {
wenzelm@63790
   120
    private val columns_index: Map[String, Int] =
wenzelm@63790
   121
      columns.iterator.map(_.name).zipWithIndex.toMap
wenzelm@63790
   122
wenzelm@63781
   123
    Library.duplicates(columns.map(_.name)) match {
wenzelm@63781
   124
      case Nil =>
wenzelm@63781
   125
      case bad => error("Duplicate column names " + commas_quote(bad) + " for table " + quote(name))
wenzelm@63781
   126
    }
wenzelm@63781
   127
wenzelm@65649
   128
    def sql: String = ident(name)
wenzelm@65649
   129
wenzelm@65325
   130
    def sql_columns(sql_type: Type.Value => String): String =
wenzelm@65325
   131
    {
wenzelm@65325
   132
      val primary_key =
wenzelm@65325
   133
        columns.filter(_.primary_key).map(_.name) match {
wenzelm@65325
   134
          case Nil => Nil
wenzelm@65325
   135
          case keys => List("PRIMARY KEY " + enclosure(keys))
wenzelm@65325
   136
        }
wenzelm@65325
   137
      enclosure(columns.map(_.sql_decl(sql_type)) ::: primary_key)
wenzelm@63781
   138
    }
wenzelm@63781
   139
wenzelm@65327
   140
    def sql_create(strict: Boolean, sql_type: Type.Value => String): String =
wenzelm@63784
   141
      "CREATE TABLE " + (if (strict) "" else "IF NOT EXISTS ") +
wenzelm@65648
   142
        ident(name) + " " + sql_columns(sql_type)
wenzelm@63780
   143
wenzelm@63780
   144
    def sql_drop(strict: Boolean): String =
wenzelm@65648
   145
      "DROP TABLE " + (if (strict) "" else "IF EXISTS ") + ident(name)
wenzelm@63783
   146
wenzelm@63791
   147
    def sql_create_index(
wenzelm@65018
   148
        index_name: String, index_columns: List[Column],
wenzelm@63791
   149
        strict: Boolean, unique: Boolean): String =
wenzelm@63791
   150
      "CREATE " + (if (unique) "UNIQUE " else "") + "INDEX " +
wenzelm@65648
   151
        (if (strict) "" else "IF NOT EXISTS ") + ident(index_name) + " ON " +
wenzelm@65648
   152
        ident(name) + " " + enclosure(index_columns.map(_.name))
wenzelm@63791
   153
wenzelm@63791
   154
    def sql_drop_index(index_name: String, strict: Boolean): String =
wenzelm@65648
   155
      "DROP INDEX " + (if (strict) "" else "IF EXISTS ") + ident(index_name)
wenzelm@63791
   156
wenzelm@63790
   157
    def sql_insert: String =
wenzelm@65648
   158
      "INSERT INTO " + ident(name) + " VALUES " + enclosure(columns.map(_ => "?"))
wenzelm@63791
   159
wenzelm@65319
   160
    def sql_delete: String =
wenzelm@65648
   161
      "DELETE FROM " + ident(name)
wenzelm@65319
   162
wenzelm@65644
   163
    def sql_select(select_columns: List[Column], distinct: Boolean = false): String =
wenzelm@65648
   164
      select(select_columns, distinct = distinct) + ident(name)
wenzelm@63790
   165
wenzelm@63783
   166
    override def toString: String =
wenzelm@65648
   167
      "TABLE " + ident(name) + " " + sql_columns(sql_type_default)
wenzelm@63780
   168
  }
wenzelm@63790
   169
wenzelm@63790
   170
wenzelm@65012
   171
wenzelm@65012
   172
  /** SQL database operations **/
wenzelm@65012
   173
wenzelm@63790
   174
  /* results */
wenzelm@63790
   175
wenzelm@63790
   176
  def iterator[A](rs: ResultSet)(get: ResultSet => A): Iterator[A] = new Iterator[A]
wenzelm@63790
   177
  {
wenzelm@63790
   178
    private var _next: Boolean = rs.next()
wenzelm@63790
   179
    def hasNext: Boolean = _next
wenzelm@63790
   180
    def next: A = { val x = get(rs); _next = rs.next(); x }
wenzelm@63790
   181
  }
wenzelm@65006
   182
wenzelm@65006
   183
  trait Database
wenzelm@65006
   184
  {
wenzelm@65008
   185
    /* types */
wenzelm@65008
   186
wenzelm@65019
   187
    def sql_type(T: Type.Value): String
wenzelm@65008
   188
wenzelm@65008
   189
wenzelm@65006
   190
    /* connection */
wenzelm@65006
   191
wenzelm@65006
   192
    def connection: Connection
wenzelm@65006
   193
wenzelm@65006
   194
    def close() { connection.close }
wenzelm@65006
   195
wenzelm@65006
   196
    def transaction[A](body: => A): A =
wenzelm@65006
   197
    {
wenzelm@65006
   198
      val auto_commit = connection.getAutoCommit
wenzelm@65006
   199
      try {
wenzelm@65006
   200
        connection.setAutoCommit(false)
wenzelm@65022
   201
        val savepoint = connection.setSavepoint
wenzelm@65022
   202
        try {
wenzelm@65022
   203
          val result = body
wenzelm@65022
   204
          connection.commit
wenzelm@65022
   205
          result
wenzelm@65022
   206
        }
wenzelm@65022
   207
        catch { case exn: Throwable => connection.rollback(savepoint); throw exn }
wenzelm@65006
   208
      }
wenzelm@65006
   209
      finally { connection.setAutoCommit(auto_commit) }
wenzelm@65006
   210
    }
wenzelm@65006
   211
wenzelm@65006
   212
wenzelm@65006
   213
    /* statements */
wenzelm@65006
   214
wenzelm@65006
   215
    def statement(sql: String): PreparedStatement = connection.prepareStatement(sql)
wenzelm@65006
   216
wenzelm@65619
   217
    def insert(table: Table): PreparedStatement = statement(table.sql_insert)
wenzelm@65006
   218
wenzelm@65619
   219
    def delete(table: Table, sql: String = ""): PreparedStatement =
wenzelm@65319
   220
      statement(table.sql_delete + (if (sql == "") "" else " " + sql))
wenzelm@65319
   221
wenzelm@65619
   222
    def select(table: Table, columns: List[Column], sql: String = "", distinct: Boolean = false)
wenzelm@65619
   223
        : PreparedStatement =
wenzelm@65644
   224
      statement(table.sql_select(columns, distinct = distinct) + (if (sql == "") "" else " " + sql))
wenzelm@65006
   225
wenzelm@65006
   226
wenzelm@65020
   227
    /* input */
wenzelm@65020
   228
wenzelm@65020
   229
    def set_bool(stmt: PreparedStatement, i: Int, x: Boolean) { stmt.setBoolean(i, x) }
wenzelm@65612
   230
    def set_bool(stmt: PreparedStatement, i: Int, x: Option[Boolean])
wenzelm@65612
   231
    {
wenzelm@65612
   232
      if (x.isDefined) set_bool(stmt, i, x.get)
wenzelm@65612
   233
      else stmt.setNull(i, java.sql.Types.BOOLEAN)
wenzelm@65612
   234
    }
wenzelm@65615
   235
wenzelm@65020
   236
    def set_int(stmt: PreparedStatement, i: Int, x: Int) { stmt.setInt(i, x) }
wenzelm@65612
   237
    def set_int(stmt: PreparedStatement, i: Int, x: Option[Int])
wenzelm@65612
   238
    {
wenzelm@65612
   239
      if (x.isDefined) set_int(stmt, i, x.get)
wenzelm@65612
   240
      else stmt.setNull(i, java.sql.Types.INTEGER)
wenzelm@65612
   241
    }
wenzelm@65615
   242
wenzelm@65020
   243
    def set_long(stmt: PreparedStatement, i: Int, x: Long) { stmt.setLong(i, x) }
wenzelm@65612
   244
    def set_long(stmt: PreparedStatement, i: Int, x: Option[Long])
wenzelm@65612
   245
    {
wenzelm@65612
   246
      if (x.isDefined) set_long(stmt, i, x.get)
wenzelm@65612
   247
      else stmt.setNull(i, java.sql.Types.BIGINT)
wenzelm@65612
   248
    }
wenzelm@65615
   249
wenzelm@65020
   250
    def set_double(stmt: PreparedStatement, i: Int, x: Double) { stmt.setDouble(i, x) }
wenzelm@65612
   251
    def set_double(stmt: PreparedStatement, i: Int, x: Option[Double])
wenzelm@65612
   252
    {
wenzelm@65612
   253
      if (x.isDefined) set_double(stmt, i, x.get)
wenzelm@65612
   254
      else stmt.setNull(i, java.sql.Types.DOUBLE)
wenzelm@65612
   255
    }
wenzelm@65615
   256
wenzelm@65020
   257
    def set_string(stmt: PreparedStatement, i: Int, x: String) { stmt.setString(i, x) }
wenzelm@65615
   258
    def set_string(stmt: PreparedStatement, i: Int, x: Option[String]): Unit =
wenzelm@65615
   259
      set_string(stmt, i, x.orNull)
wenzelm@65615
   260
wenzelm@65020
   261
    def set_bytes(stmt: PreparedStatement, i: Int, bytes: Bytes)
wenzelm@65610
   262
    {
wenzelm@65610
   263
      if (bytes == null) stmt.setBytes(i, null)
wenzelm@65610
   264
      else stmt.setBinaryStream(i, bytes.stream(), bytes.length)
wenzelm@65610
   265
    }
wenzelm@65615
   266
    def set_bytes(stmt: PreparedStatement, i: Int, bytes: Option[Bytes]): Unit =
wenzelm@65615
   267
      set_bytes(stmt, i, bytes.orNull)
wenzelm@65615
   268
wenzelm@65615
   269
    def set_date(stmt: PreparedStatement, i: Int, date: Date): Unit
wenzelm@65615
   270
    def set_date(stmt: PreparedStatement, i: Int, date: Option[Date]): Unit =
wenzelm@65615
   271
      set_date(stmt, i, date.orNull)
wenzelm@65020
   272
wenzelm@65022
   273
wenzelm@65020
   274
    /* output */
wenzelm@65018
   275
wenzelm@65620
   276
    def bool(rs: ResultSet, column: Column): Boolean = rs.getBoolean(column.name)
wenzelm@65620
   277
    def int(rs: ResultSet, column: Column): Int = rs.getInt(column.name)
wenzelm@65620
   278
    def long(rs: ResultSet, column: Column): Long = rs.getLong(column.name)
wenzelm@65620
   279
    def double(rs: ResultSet, column: Column): Double = rs.getDouble(column.name)
wenzelm@65620
   280
    def string(rs: ResultSet, column: Column): String =
wenzelm@65018
   281
    {
wenzelm@65620
   282
      val s = rs.getString(column.name)
wenzelm@65018
   283
      if (s == null) "" else s
wenzelm@65018
   284
    }
wenzelm@65620
   285
    def bytes(rs: ResultSet, column: Column): Bytes =
wenzelm@65018
   286
    {
wenzelm@65620
   287
      val bs = rs.getBytes(column.name)
wenzelm@65018
   288
      if (bs == null) Bytes.empty else Bytes(bs)
wenzelm@65018
   289
    }
wenzelm@65620
   290
    def date(rs: ResultSet, column: Column): Date
wenzelm@65018
   291
wenzelm@65620
   292
    def get[A](rs: ResultSet, column: Column, f: (ResultSet, Column) => A): Option[A] =
wenzelm@65018
   293
    {
wenzelm@65620
   294
      val x = f(rs, column)
wenzelm@65018
   295
      if (rs.wasNull) None else Some(x)
wenzelm@65018
   296
    }
wenzelm@65018
   297
wenzelm@65018
   298
wenzelm@65006
   299
    /* tables */
wenzelm@65006
   300
wenzelm@65006
   301
    def tables: List[String] =
wenzelm@65006
   302
      iterator(connection.getMetaData.getTables(null, null, "%", null))(_.getString(3)).toList
wenzelm@65006
   303
wenzelm@65327
   304
    def create_table(table: Table, strict: Boolean = false, sql: String = ""): Unit =
wenzelm@65327
   305
      using(statement(table.sql_create(strict, sql_type) + (if (sql == "") "" else " " + sql)))(
wenzelm@65327
   306
        _.execute())
wenzelm@65006
   307
wenzelm@65280
   308
    def drop_table(table: Table, strict: Boolean = false): Unit =
wenzelm@65006
   309
      using(statement(table.sql_drop(strict)))(_.execute())
wenzelm@65006
   310
wenzelm@65018
   311
    def create_index(table: Table, name: String, columns: List[Column],
wenzelm@65280
   312
        strict: Boolean = false, unique: Boolean = false): Unit =
wenzelm@65006
   313
      using(statement(table.sql_create_index(name, columns, strict, unique)))(_.execute())
wenzelm@65006
   314
wenzelm@65280
   315
    def drop_index(table: Table, name: String, strict: Boolean = false): Unit =
wenzelm@65006
   316
      using(statement(table.sql_drop_index(name, strict)))(_.execute())
wenzelm@65006
   317
  }
wenzelm@63778
   318
}
wenzelm@65006
   319
wenzelm@65006
   320
wenzelm@65006
   321
wenzelm@65006
   322
/** SQLite **/
wenzelm@65006
   323
wenzelm@65006
   324
object SQLite
wenzelm@65006
   325
{
wenzelm@65021
   326
  // see https://www.sqlite.org/lang_datefunc.html
wenzelm@65021
   327
  val date_format: Date.Format = Date.Format("uuuu-MM-dd HH:mm:ss.SSS x")
wenzelm@65021
   328
wenzelm@65292
   329
  lazy val init_jdbc: Unit = Class.forName("org.sqlite.JDBC")
wenzelm@65292
   330
wenzelm@65006
   331
  def open_database(path: Path): Database =
wenzelm@65006
   332
  {
wenzelm@65292
   333
    init_jdbc
wenzelm@65006
   334
    val path0 = path.expand
wenzelm@65006
   335
    val s0 = File.platform_path(path0)
wenzelm@65006
   336
    val s1 = if (Platform.is_windows) s0.replace('\\', '/') else s0
wenzelm@65006
   337
    val connection = DriverManager.getConnection("jdbc:sqlite:" + s1)
wenzelm@65007
   338
    new Database(path0.toString, connection)
wenzelm@65006
   339
  }
wenzelm@65006
   340
wenzelm@65007
   341
  class Database private[SQLite](name: String, val connection: Connection) extends SQL.Database
wenzelm@65006
   342
  {
wenzelm@65007
   343
    override def toString: String = name
wenzelm@65006
   344
wenzelm@65019
   345
    def sql_type(T: SQL.Type.Value): String = SQL.sql_type_sqlite(T)
wenzelm@65011
   346
wenzelm@65021
   347
    def set_date(stmt: PreparedStatement, i: Int, date: Date): Unit =
wenzelm@65615
   348
      if (date == null) set_string(stmt, i, null: String)
wenzelm@65598
   349
      else set_string(stmt, i, date_format(date))
wenzelm@65598
   350
wenzelm@65620
   351
    def date(rs: ResultSet, column: SQL.Column): Date =
wenzelm@65620
   352
      date_format.parse(string(rs, column))
wenzelm@65021
   353
wenzelm@65006
   354
    def rebuild { using(statement("VACUUM"))(_.execute()) }
wenzelm@65006
   355
  }
wenzelm@65006
   356
}
wenzelm@65006
   357
wenzelm@65006
   358
wenzelm@65006
   359
wenzelm@65006
   360
/** PostgreSQL **/
wenzelm@65006
   361
wenzelm@65006
   362
object PostgreSQL
wenzelm@65006
   363
{
wenzelm@65006
   364
  val default_port = 5432
wenzelm@65006
   365
wenzelm@65292
   366
  lazy val init_jdbc: Unit = Class.forName("org.postgresql.Driver")
wenzelm@65292
   367
wenzelm@65006
   368
  def open_database(
wenzelm@65006
   369
    user: String,
wenzelm@65006
   370
    password: String,
wenzelm@65006
   371
    database: String = "",
wenzelm@65006
   372
    host: String = "",
wenzelm@65594
   373
    port: Int = 0,
wenzelm@65636
   374
    ssh: Option[SSH.Session] = None,
wenzelm@65636
   375
    ssh_close: Boolean = false): Database =
wenzelm@65006
   376
  {
wenzelm@65292
   377
    init_jdbc
wenzelm@65292
   378
wenzelm@65641
   379
    if (user == "") error("Undefined database user")
wenzelm@65009
   380
wenzelm@65009
   381
    val db_host = if (host != "") host else "localhost"
wenzelm@65594
   382
    val db_port = if (port > 0 && port != default_port) ":" + port else ""
wenzelm@65009
   383
    val db_name = "/" + (if (database != "") database else user)
wenzelm@65009
   384
wenzelm@65010
   385
    val (url, name, port_forwarding) =
wenzelm@65009
   386
      ssh match {
wenzelm@65010
   387
        case None =>
wenzelm@65010
   388
          val spec = db_host + db_port + db_name
wenzelm@65010
   389
          val url = "jdbc:postgresql://" + spec
wenzelm@65010
   390
          val name = user + "@" + spec
wenzelm@65010
   391
          (url, name, None)
wenzelm@65009
   392
        case Some(ssh) =>
wenzelm@65594
   393
          val fw =
wenzelm@65594
   394
            ssh.port_forwarding(remote_host = db_host,
wenzelm@65636
   395
              remote_port = if (port > 0) port else default_port,
wenzelm@65636
   396
              ssh_close = ssh_close)
wenzelm@65010
   397
          val url = "jdbc:postgresql://localhost:" + fw.local_port + db_name
wenzelm@65010
   398
          val name = user + "@" + fw + db_name + " via ssh " + ssh
wenzelm@65010
   399
          (url, name, Some(fw))
wenzelm@65009
   400
      }
wenzelm@65009
   401
    try {
wenzelm@65010
   402
      val connection = DriverManager.getConnection(url, user, password)
wenzelm@65010
   403
      new Database(name, connection, port_forwarding)
wenzelm@65009
   404
    }
wenzelm@65009
   405
    catch { case exn: Throwable => port_forwarding.foreach(_.close); throw exn }
wenzelm@65006
   406
  }
wenzelm@65006
   407
wenzelm@65009
   408
  class Database private[PostgreSQL](
wenzelm@65009
   409
      name: String, val connection: Connection, port_forwarding: Option[SSH.Port_Forwarding])
wenzelm@65009
   410
    extends SQL.Database
wenzelm@65006
   411
  {
wenzelm@65010
   412
    override def toString: String = name
wenzelm@65008
   413
wenzelm@65019
   414
    def sql_type(T: SQL.Type.Value): String = SQL.sql_type_postgresql(T)
wenzelm@65009
   415
wenzelm@65021
   416
    // see https://jdbc.postgresql.org/documentation/head/8-date-time.html
wenzelm@65021
   417
    def set_date(stmt: PreparedStatement, i: Int, date: Date): Unit =
wenzelm@65598
   418
      if (date == null) stmt.setObject(i, null)
wenzelm@65598
   419
      else stmt.setObject(i, OffsetDateTime.from(date.to_utc.rep))
wenzelm@65598
   420
wenzelm@65620
   421
    def date(rs: ResultSet, column: SQL.Column): Date =
wenzelm@65620
   422
      Date.instant(rs.getObject(column.name, classOf[OffsetDateTime]).toInstant)
wenzelm@65021
   423
wenzelm@65009
   424
    override def close() { super.close; port_forwarding.foreach(_.close) }
wenzelm@65006
   425
  }
wenzelm@65006
   426
}