/* Title: Pure/Tools/sql.scala
Author: Makarius
Generic support for SQL.
*/
package isabelle
import java.sql.ResultSet
object SQL
{
/* 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 =
{
require(!s.contains('`'))
"`" + s + "`"
}
/* 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)
}
abstract class Column[+A] private[SQL](
val name: String, val strict: Boolean, val primary_key: Boolean)
{
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 = "INTEGER"
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 = "REAL"
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)
extends Column[Bytes](name, strict, primary_key)
{
def sql_type: String = "BLOB"
def apply(rs: ResultSet): Bytes =
{
val bs = rs.getBytes(name)
if (bs == null) Bytes.empty else Bytes(bs)
}
}
/* tables */
def table(name: String, columns: Column[Any]*): Table = new Table(name, columns.toList)
class Table private[SQL](name: String, columns: List[Column[Any]])
{
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) + " " + columns.map(_.sql_decl).mkString("(", ", ", ")") +
(if (rowid) "" else " WITHOUT ROWID")
def sql_drop(strict: Boolean): String =
"DROP TABLE " + (if (strict) "" else "IF EXISTS ") + quote_ident(name)
override def toString: String =
"TABLE " + quote_ident(name) + " " + columns.map(_.toString).mkString("(", ", ", ")")
}
}