/* Title: Pure/General/sql.scala
Author: Makarius
Support for SQL databases: SQLite and PostgreSQL.
*/
package isabelle
import java.sql.{DriverManager, Connection, PreparedStatement, ResultSet}
object SQL
{
/** SQL language **/
/* concrete syntax */
def quote_char(c: Char): String =
c match {
case '\u0000' => "\\0"
case '\'' => "\\'"
case '\"' => "\\\""
case '\b' => "\\b"
case '\n' => "\\n"
case '\r' => "\\r"
case '\t' => "\\t"
case '\u001a' => "\\Z"
case '\\' => "\\\\"
case _ => c.toString
}
def quote_string(s: String): String =
quote(s.map(quote_char(_)).mkString)
def quote_ident(s: String): String =
quote(s.replace("\"", "\"\""))
def enclosure(ss: Iterable[String]): String = ss.mkString("(", ", ", ")")
/* columns */
object Column
{
def int(name: String, strict: Boolean = true, primary_key: Boolean = false): Column[Int] =
new Column_Int(name, strict, primary_key)
def long(name: String, strict: Boolean = true, primary_key: Boolean = false): Column[Long] =
new Column_Long(name, strict, primary_key)
def double(name: String, strict: Boolean = true, primary_key: Boolean = false): Column[Double] =
new Column_Double(name, strict, primary_key)
def string(name: String, strict: Boolean = true, primary_key: Boolean = false): Column[String] =
new Column_String(name, strict, primary_key)
def bytes(name: String, strict: Boolean = true, primary_key: Boolean = false): Column[Bytes] =
new Column_Bytes(name, strict, primary_key, "BLOB") // SQL standard
def bytea(name: String, strict: Boolean = true, primary_key: Boolean = false): Column[Bytes] =
new Column_Bytes(name, strict, primary_key, "BYTEA") // PostgreSQL
}
abstract class Column[+A] private[SQL](
val name: String, val strict: Boolean, val primary_key: Boolean)
extends Function[ResultSet, A]
{
def sql_name: String = quote_ident(name)
def sql_type: String
def sql_decl: String =
sql_name + " " + sql_type +
(if (strict) " NOT NULL" else "") +
(if (primary_key) " PRIMARY KEY" else "")
def string(rs: ResultSet): String =
{
val s = rs.getString(name)
if (s == null) "" else s
}
def apply(rs: ResultSet): A
def get(rs: ResultSet): Option[A] =
{
val x = apply(rs)
if (rs.wasNull) None else Some(x)
}
override def toString: String = sql_decl
}
class Column_Int private[SQL](name: String, strict: Boolean, primary_key: Boolean)
extends Column[Int](name, strict, primary_key)
{
def sql_type: String = "INTEGER"
def apply(rs: ResultSet): Int = rs.getInt(name)
}
class Column_Long private[SQL](name: String, strict: Boolean, primary_key: Boolean)
extends Column[Long](name, strict, primary_key)
{
def sql_type: String = "BIGINT"
def apply(rs: ResultSet): Long = rs.getLong(name)
}
class Column_Double private[SQL](name: String, strict: Boolean, primary_key: Boolean)
extends Column[Double](name, strict, primary_key)
{
def sql_type: String = "DOUBLE PRECISION"
def apply(rs: ResultSet): Double = rs.getDouble(name)
}
class Column_String private[SQL](name: String, strict: Boolean, primary_key: Boolean)
extends Column[String](name, strict, primary_key)
{
def sql_type: String = "TEXT"
def apply(rs: ResultSet): String =
{
val s = rs.getString(name)
if (s == null) "" else s
}
}
class Column_Bytes private[SQL](
name: String, strict: Boolean, primary_key: Boolean, val sql_type: String)
extends Column[Bytes](name, strict, primary_key)
{
def apply(rs: ResultSet): Bytes =
{
val bs = rs.getBytes(name)
if (bs == null) Bytes.empty else Bytes(bs)
}
}
/* tables */
def table(name: String, columns: List[Column[Any]]): Table = new Table(name, columns)
class Table private[SQL](name: String, columns: List[Column[Any]])
{
private val columns_index: Map[String, Int] =
columns.iterator.map(_.name).zipWithIndex.toMap
Library.duplicates(columns.map(_.name)) match {
case Nil =>
case bad => error("Duplicate column names " + commas_quote(bad) + " for table " + quote(name))
}
columns.filter(_.primary_key) match {
case bad if bad.length > 1 =>
error("Multiple primary keys " + commas_quote(bad.map(_.name)) + " for table " + quote(name))
case _ =>
}
def sql_create(strict: Boolean, rowid: Boolean): String =
"CREATE TABLE " + (if (strict) "" else "IF NOT EXISTS ") +
quote_ident(name) + " " + enclosure(columns.map(_.sql_decl)) +
(if (rowid) "" else " WITHOUT ROWID")
def sql_drop(strict: Boolean): String =
"DROP TABLE " + (if (strict) "" else "IF EXISTS ") + quote_ident(name)
def sql_create_index(
index_name: String, index_columns: List[Column[Any]],
strict: Boolean, unique: Boolean): String =
"CREATE " + (if (unique) "UNIQUE " else "") + "INDEX " +
(if (strict) "" else "IF NOT EXISTS ") + quote_ident(index_name) + " ON " +
quote_ident(name) + " " + enclosure(index_columns.map(_.name))
def sql_drop_index(index_name: String, strict: Boolean): String =
"DROP INDEX " + (if (strict) "" else "IF EXISTS ") + quote_ident(index_name)
def sql_insert: String =
"INSERT INTO " + quote_ident(name) + " VALUES " + enclosure(columns.map(_ => "?"))
def sql_select(select_columns: List[Column[Any]], distinct: Boolean): String =
"SELECT " + (if (distinct) "DISTINCT " else "") +
commas(select_columns.map(_.sql_name)) + " FROM " + quote_ident(name)
override def toString: String =
"TABLE " + quote_ident(name) + " " + enclosure(columns.map(_.toString))
}
/* results */
def iterator[A](rs: ResultSet)(get: ResultSet => A): Iterator[A] = new Iterator[A]
{
private var _next: Boolean = rs.next()
def hasNext: Boolean = _next
def next: A = { val x = get(rs); _next = rs.next(); x }
}
/** SQL database operations **/
trait Database
{
/* connection */
def connection: Connection
def close() { connection.close }
def transaction[A](body: => A): A =
{
val auto_commit = connection.getAutoCommit
val savepoint = connection.setSavepoint
try {
connection.setAutoCommit(false)
val result = body
connection.commit
result
}
catch { case exn: Throwable => connection.rollback(savepoint); throw exn }
finally { connection.setAutoCommit(auto_commit) }
}
/* statements */
def statement(sql: String): PreparedStatement = connection.prepareStatement(sql)
def insert_statement(table: Table): PreparedStatement = statement(table.sql_insert)
def select_statement(table: Table, columns: List[Column[Any]],
sql: String = "", distinct: Boolean = false): PreparedStatement =
statement(table.sql_select(columns, distinct) + (if (sql == "") "" else " " + sql))
/* tables */
def tables: List[String] =
iterator(connection.getMetaData.getTables(null, null, "%", null))(_.getString(3)).toList
def create_table(table: Table, strict: Boolean = true, rowid: Boolean = true): Unit =
using(statement(table.sql_create(strict, rowid)))(_.execute())
def drop_table(table: Table, strict: Boolean = true): Unit =
using(statement(table.sql_drop(strict)))(_.execute())
def create_index(table: Table, name: String, columns: List[Column[Any]],
strict: Boolean = true, unique: Boolean = false): Unit =
using(statement(table.sql_create_index(name, columns, strict, unique)))(_.execute())
def drop_index(table: Table, name: String, strict: Boolean = true): Unit =
using(statement(table.sql_drop_index(name, strict)))(_.execute())
}
}
/** SQLite **/
object SQLite
{
def open_database(path: Path): Database =
{
val path0 = path.expand
val s0 = File.platform_path(path0)
val s1 = if (Platform.is_windows) s0.replace('\\', '/') else s0
val connection = DriverManager.getConnection("jdbc:sqlite:" + s1)
new Database(path0, connection)
}
class Database private[SQLite](path: Path, val connection: Connection) extends SQL.Database
{
override def toString: String = path.toString
def rebuild { using(statement("VACUUM"))(_.execute()) }
}
}
/** PostgreSQL **/
object PostgreSQL
{
val default_port = 5432
def open_database(
user: String,
password: String,
database: String = "",
host: String = "",
port: Int = default_port): Database =
{
require(user != "")
val spec =
(if (host != "") host else "localhost") +
(if (port != default_port) ":" + port else "") + "/" +
(if (database != "") database else user)
val connection = DriverManager.getConnection("jdbc:postgresql://" + spec, user, password)
new Database(spec, connection)
}
class Database private[PostgreSQL](spec: String, val connection: Connection) extends SQL.Database
{
override def toString: String = spec
}
}