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scalikejdbc.DBSession.scala Maven / Gradle / Ivy
/*
* Copyright 2011 Kazuhiro Sera
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
* either express or implied. See the License for the specific language
* governing permissions and limitations under the License.
*/
package scalikejdbc
import java.sql._
import util.control.Exception._
/**
* DB Session
*
* This class provides readOnly/autoCommit/localTx/withinTx blocks and session objects.
*
* {{{
* import scalikejdbc._
*
* val userIdList = DB autoCommit { session: DBSession =>
* session.list("select * from user") { rs => rs.int("id") }
* }
* }}}
*/
trait DBSession extends LogSupport {
/**
* Connection
*/
val conn: Connection
lazy val connection: Connection = conn
val isReadOnly: Boolean
/**
* Create [[java.sql.Statement]] executor.
*
* @param conn connection
* @param template SQL template
* @param params parameters
* @param returnGeneratedKeys is generated keys required
* @return statement executor
*/
private def createStatementExecutor(conn: Connection, template: String, params: Seq[Any],
returnGeneratedKeys: Boolean = false): StatementExecutor = {
val statement = if (returnGeneratedKeys) {
conn.prepareStatement(template, Statement.RETURN_GENERATED_KEYS)
} else {
conn.prepareStatement(template)
}
StatementExecutor(
underlying = statement,
template = template,
params = params)
}
/**
* Ensures the current session is not in read-only mode.
* @param template
*/
private def ensureNotReadOnlySession(template: String): Unit = {
if (isReadOnly) {
throw new java.sql.SQLException(
ErrorMessage.CANNOT_EXECUTE_IN_READ_ONLY_SESSION + " (template:" + template + ")")
}
}
/**
* Returns single result optionally.
* If the result is not single, [[scalikejdbc.TooManyRowsException]] will be thrown.
*
* @param template SQL template
* @param params parameters
* @param extract extract function
* @tparam A return type
* @return result optionally
*/
def single[A](template: String, params: Any*)(extract: WrappedResultSet => A): Option[A] = {
using(createStatementExecutor(conn, template, params)) {
executor =>
val resultSet = new ResultSetTraversable(executor.executeQuery())
val rows = (resultSet map (rs => extract(rs))).toList
rows match {
case Nil => None
case one :: Nil => Option(one)
case _ => throw new TooManyRowsException(1, rows.size)
}
}
}
/**
* Returns the first row optionally.
*
* @param template SQL template
* @param params parameters
* @param extract extract function
* @tparam A return type
* @return result optionally
*/
def first[A](template: String, params: Any*)(extract: WrappedResultSet => A): Option[A] = {
list(template, params: _*)(extract).headOption
}
/**
* Returns query result as [[scala.collection.immutable.List]] object.
*
* @param template SQL template
* @param params parameters
* @param extract extract function
* @tparam A return type
* @return result as list
*/
def list[A](template: String, params: Any*)(extract: WrappedResultSet => A): List[A] = {
traversable(template, params: _*)(extract).toList
}
/**
* Applies side-effect to each row iteratively.
*
* @param template SQL template
* @param params parameters
* @param f function
* @return result as list
*/
def foreach(template: String, params: Any*)(f: WrappedResultSet => Unit): Unit = {
using(createStatementExecutor(conn, template, params)) {
executor =>
new ResultSetTraversable(executor.executeQuery()) foreach (rs => f(rs))
}
}
/**
* Returns query result as [[scala.collection.Traversable]] object.
*
* @param template SQL template
* @param params parameters
* @param extract extract function
* @tparam A return type
* @return result as traversable
*/
def traversable[A](template: String, params: Any*)(extract: WrappedResultSet => A): Traversable[A] = {
using(createStatementExecutor(conn, template, params)) { executor =>
new ResultSetTraversable(executor.executeQuery()) map (rs => extract(rs))
}
}
/**
* Executes [[java.sql.PreparedStatement#execute()]].
*
* @param template SQL template
* @param params parameters
* @return flag
*/
def execute(template: String, params: Any*): Boolean = {
ensureNotReadOnlySession(template)
using(createStatementExecutor(conn, template, params)) {
executor =>
executor.execute()
}
}
/**
* Executes [[java.sql.PreparedStatement#execute()]].
*
* @param before before filter
* @param after after filter
* @param template SQL template
* @param params parameters
* @return flag
*/
def executeWithFilters(before: (PreparedStatement) => Unit,
after: (PreparedStatement) => Unit,
template: String,
params: Any*): Boolean = {
ensureNotReadOnlySession(template)
using(createStatementExecutor(conn, template, params)) {
executor =>
before(executor.underlying)
val result = executor.execute()
after(executor.underlying)
result
}
}
/**
* Executes [[java.sql.PreparedStatement#executeUpdate()]].
*
* @param template SQL template
* @param params parameters
* @return result count
*/
def executeUpdate(template: String, params: Any*): Int = update(template, params: _*)
/**
* Executes [[java.sql.PreparedStatement#executeUpdate()]].
*
* @param template SQL template
* @param params parameters
* @return result count
*/
def update(template: String, params: Any*): Int = {
ensureNotReadOnlySession(template)
using(createStatementExecutor(conn, template, params)) {
executor =>
executor.executeUpdate()
}
}
/**
* Executes [[java.sql.PreparedStatement#executeUpdate()]].
*
* @param before before filter
* @param after after filter
* @param template SQL template
* @param params parameters
* @return result count
*/
def updateWithFilters(before: (PreparedStatement) => Unit,
after: (PreparedStatement) => Unit,
template: String,
params: Any*): Int = updateWithFilters(false, before, after, template, params: _*)
/**
* Executes [[java.sql.PreparedStatement#executeUpdate()]].
*
* @param returnGeneratedKeys is generated keys required
* @param before before filter
* @param after after filter
* @param template SQL template
* @param params parameters
* @return result count
*/
def updateWithFilters(returnGeneratedKeys: Boolean,
before: (PreparedStatement) => Unit,
after: (PreparedStatement) => Unit,
template: String,
params: Any*): Int = {
ensureNotReadOnlySession(template)
using(createStatementExecutor(
conn = conn,
template = template,
params = params,
returnGeneratedKeys = returnGeneratedKeys)) {
executor =>
before(executor.underlying)
val count = executor.executeUpdate()
after(executor.underlying)
count
}
}
/**
* Executes [[java.sql.PreparedStatement#executeUpdate()]] and returns the generated key.
*
* @param template SQL template
* @param params paramters
* @return generated key as a long value
*/
def updateAndReturnGeneratedKey(template: String, params: Any*): Long = {
var generatedKeyFound = false
var generatedKey: Long = -1
val before = (stmt: PreparedStatement) => {}
val after = (stmt: PreparedStatement) => {
val rs = stmt.getGeneratedKeys
while (rs.next()) {
generatedKeyFound = true
generatedKey = rs.getLong(1)
}
}
updateWithFilters(true, before, after, template, params: _*)
if (!generatedKeyFound) {
throw new IllegalStateException(ErrorMessage.FAILED_TO_RETRIEVE_GENERATED_KEY + " (template:" + template + ")")
}
generatedKey
}
/**
* Close the connection.
*/
def close(): Unit = {
ignoring(classOf[Throwable]) {
conn.close()
}
log.debug("A Connection is closed.")
}
}
object DBSession {
def apply(conn: Connection, tx: Option[Tx] = None, isReadOnly: Boolean = false) = ActiveSession(conn, tx, isReadOnly)
}
/**
* Active session implementation of [[scalikejdbc.DBSession]].
*
* This class provides readOnly/autoCommit/localTx/withinTx blocks and session objects.
*
* {{{
* import scalikejdbc._
*
* val userIdList = DB autoCommit { session: DBSession =>
* session.list("select * from user") { rs => rs.int("id") }
* }
* }}}
*
* @param conn connection
* @param tx transaction
* @param isReadOnly is read only
*/
case class ActiveSession(conn: Connection, tx: Option[Tx] = None, isReadOnly: Boolean = false)
extends DBSession {
tx match {
case Some(tx) if tx.isActive() => // nothing to do
case None => conn.setAutoCommit(true)
case _ => throw new IllegalStateException(ErrorMessage.TRANSACTION_IS_NOT_ACTIVE)
}
}
/**
* Represents that there is no active session.
*/
case object NoSession extends DBSession {
val conn: Connection = null
val tx: Option[Tx] = None
val isReadOnly: Boolean = false
}
/**
* Represents that already existing session will be used or a new session will be started.
*/
case object AutoSession extends DBSession {
val conn: Connection = null
val tx: Option[Tx] = None
val isReadOnly: Boolean = false
}
/**
* Represents that already existing session will be used or a new session which is retrieved from named connection pool will be started.
*/
case class NamedAutoSession(name: Any) extends DBSession {
val conn: Connection = null
val tx: Option[Tx] = None
val isReadOnly: Boolean = false
}
