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calasql-core_3.0.1.5.source-code.DbApi.scala Maven / Gradle / Ivy
package scalasql.core
import geny.Generator
import java.sql.{PreparedStatement, Statement}
/**
* An interface to the SQL database allowing you to run queries.
*/
trait DbApi extends AutoCloseable {
/**
* Converts the given query [[Q]] into a string. Useful for debugging and logging
*/
def renderSql[Q, R](query: Q, castParams: Boolean = false)(implicit qr: Queryable[Q, R]): String
/**
* Runs the given query [[Q]] and returns a value of type [[R]]
*/
def run[Q, R](query: Q, fetchSize: Int = -1, queryTimeoutSeconds: Int = -1)(
implicit qr: Queryable[Q, R],
fileName: sourcecode.FileName,
lineNum: sourcecode.Line
): R
/**
* Runs the given [[SqlStr]] of the form `sql"..."` and returns a value of type [[R]]
*/
def runSql[R](query: SqlStr, fetchSize: Int = -1, queryTimeoutSeconds: Int = -1)(
implicit qr: Queryable.Row[?, R],
fileName: sourcecode.FileName,
lineNum: sourcecode.Line
): IndexedSeq[R]
/**
* Runs the given query [[Q]] and returns a [[Generator]] of values of type [[R]].
* allow you to process the results in a streaming fashion without materializing
* the entire list of results in memory
*/
def stream[Q, R](query: Q, fetchSize: Int = -1, queryTimeoutSeconds: Int = -1)(
implicit qr: Queryable[Q, Seq[R]],
fileName: sourcecode.FileName,
lineNum: sourcecode.Line
): Generator[R]
/**
* A combination of [[stream]] and [[runSql]], [[streamSql]] allows you to pass in an
* arbitrary [[SqlStr]] of the form `sql"..."` and streams the results back to you
*/
def streamSql[R](sql: SqlStr, fetchSize: Int = -1, queryTimeoutSeconds: Int = -1)(
implicit qr: Queryable.Row[?, R],
fileName: sourcecode.FileName,
lineNum: sourcecode.Line
): Generator[R]
/**
* Runs a `java.lang.String` (and any interpolated variables) and deserializes
* the result set into a `Seq` of the given type [[R]]
*/
def runRaw[R](
sql: String,
variables: Seq[Any] = Nil,
fetchSize: Int = -1,
queryTimeoutSeconds: Int = -1
)(
implicit qr: Queryable.Row[?, R],
fileName: sourcecode.FileName,
lineNum: sourcecode.Line
): IndexedSeq[R]
/**
* Runs a `java.lang.String` (and any interpolated variables) and deserializes
* the result set into a streaming `Generator` of the given type [[R]]
*/
def streamRaw[R](
sql: String,
variables: Seq[Any] = Nil,
fetchSize: Int = -1,
queryTimeoutSeconds: Int = -1
)(
implicit qr: Queryable.Row[?, R],
fileName: sourcecode.FileName,
lineNum: sourcecode.Line
): Generator[R]
/**
* Runs an [[SqlStr]] of the form `sql"..."` containing an `UPDATE` or `INSERT` query and returns the
* number of rows affected
*/
def updateSql(sql: SqlStr, fetchSize: Int = -1, queryTimeoutSeconds: Int = -1)(
implicit fileName: sourcecode.FileName,
lineNum: sourcecode.Line
): Int
/**
* Runs an `java.lang.String` (and any interpolated variables) containing an
* `UPDATE` or `INSERT` query and returns the number of rows affected
*/
def updateRaw(
sql: String,
variables: Seq[Any] = Nil,
fetchSize: Int = -1,
queryTimeoutSeconds: Int = -1
)(implicit fileName: sourcecode.FileName, lineNum: sourcecode.Line): Int
def updateGetGeneratedKeysSql[R](sql: SqlStr, fetchSize: Int = -1, queryTimeoutSeconds: Int = -1)(
implicit qr: Queryable.Row[?, R],
fileName: sourcecode.FileName,
lineNum: sourcecode.Line
): IndexedSeq[R]
def updateGetGeneratedKeysRaw[R](
sql: String,
variables: Seq[Any] = Nil,
fetchSize: Int = -1,
queryTimeoutSeconds: Int = -1
)(
implicit qr: Queryable.Row[?, R],
fileName: sourcecode.FileName,
lineNum: sourcecode.Line
): IndexedSeq[R]
}
object DbApi {
def unpackQueryable[R, Q](query: Q, qr: Queryable[Q, R], config: Config) = {
val ctx = Context.Impl(Map(), Map(), config)
val flattened = SqlStr.flatten(qr.renderSql(query, ctx))
flattened
}
def renderSql[Q, R](query: Q, config: Config, castParams: Boolean = false)(
implicit qr: Queryable[Q, R]
): String = {
val flattened = unpackQueryable(query, qr, config)
flattened.renderSql(castParams)
}
/**
* An interface to a SQL database *transaction*, allowing you to run queries,
* create savepoints, or roll back the transaction.
*/
trait Txn extends DbApi {
/**
* Creates a SQL Savepoint that is active within the given block; automatically
* releases the savepoint if the block completes successfully and rolls it back
* if the block terminates with an exception, and allows you to roll back the
* savepoint manually via the [[DbApi.Savepoint]] parameter passed to that block
*/
def savepoint[T](block: DbApi.Savepoint => T): T
/**
* Tolls back any active Savepoints and then rolls back this Transaction
*/
def rollback(): Unit
}
/**
* A SQL `SAVEPOINT`, with an ID, name, and the ability to roll back to when it was created
*/
trait Savepoint {
def savepointId: Int
def savepointName: String
def rollback(): Unit
}
// Call hierarchy the various DbApi.Impl methods, both public and private:
//
// run
// |
// runRaw runSql +---------+---------+
// | | | |
// streamRaw streamSql stream updateRaw updateSql
// | | | | |
// | streamFlattened0 | |
// | | | |
// +-----+------------+ +----+----+
// | |
// streamRaw0 runRawUpdate0
// | |
// +----------------+---------------+
// |
// configureRunCloseStatement
class Impl(
connection: java.sql.Connection,
config: Config,
dialect: DialectConfig,
autoCommit: Boolean,
rollBack0: () => Unit
) extends DbApi.Txn {
def run[Q, R](query: Q, fetchSize: Int = -1, queryTimeoutSeconds: Int = -1)(
implicit qr: Queryable[Q, R],
fileName: sourcecode.FileName,
lineNum: sourcecode.Line
): R = {
val flattened = unpackQueryable(query, qr, config)
if (qr.isGetGeneratedKeys(query).nonEmpty)
updateGetGeneratedKeysSql(flattened)(qr.isGetGeneratedKeys(query).get, fileName, lineNum)
.asInstanceOf[R]
else if (qr.isExecuteUpdate(query)) updateSql(flattened).asInstanceOf[R]
else {
val res = stream(query, fetchSize, queryTimeoutSeconds)(
qr.asInstanceOf[Queryable[Q, Seq[?]]],
fileName,
lineNum
)
if (qr.isSingleRow(query)) {
val results = res.take(2).toVector
assert(
results.size == 1,
s"Single row query must return 1 result, not ${results.size}"
)
results.head.asInstanceOf[R]
} else {
res.toVector.asInstanceOf[R]
}
}
}
def stream[Q, R](query: Q, fetchSize: Int = -1, queryTimeoutSeconds: Int = -1)(
implicit qr: Queryable[Q, Seq[R]],
fileName: sourcecode.FileName,
lineNum: sourcecode.Line
): Generator[R] = {
val flattened = unpackQueryable(query, qr, config)
streamFlattened0(
r => {
qr.asInstanceOf[Queryable[Q, R]].construct(query, r) match {
case s: Seq[R] => s.head
case r: R => r
}
},
flattened,
fetchSize,
queryTimeoutSeconds,
fileName,
lineNum
)
}
def runSql[R](
sql: SqlStr,
fetchSize: Int = -1,
queryTimeoutSeconds: Int = -1
)(
implicit qr: Queryable.Row[?, R],
fileName: sourcecode.FileName,
lineNum: sourcecode.Line
): IndexedSeq[R] = streamSql(sql, fetchSize, queryTimeoutSeconds).toVector
def streamSql[R](
sql: SqlStr,
fetchSize: Int = -1,
queryTimeoutSeconds: Int = -1
)(
implicit qr: Queryable.Row[?, R],
fileName: sourcecode.FileName,
lineNum: sourcecode.Line
): Generator[R] = {
streamFlattened0(
qr.construct,
SqlStr.flatten(sql),
fetchSize,
queryTimeoutSeconds,
fileName,
lineNum
)
}
def updateSql(sql: SqlStr, fetchSize: Int = -1, queryTimeoutSeconds: Int = -1)(
implicit fileName: sourcecode.FileName,
lineNum: sourcecode.Line
): Int = {
val flattened = SqlStr.flatten(sql)
runRawUpdate0(
flattened.renderSql(DialectConfig.castParams(dialect)),
flattenParamPuts(flattened),
fetchSize,
queryTimeoutSeconds,
fileName,
lineNum
)
}
def updateGetGeneratedKeysSql[R](
sql: SqlStr,
fetchSize: Int = -1,
queryTimeoutSeconds: Int = -1
)(
implicit qr: Queryable.Row[?, R],
fileName: sourcecode.FileName,
lineNum: sourcecode.Line
): IndexedSeq[R] = {
val flattened = SqlStr.flatten(sql)
runRawUpdateGetGeneratedKeys0(
flattened.renderSql(DialectConfig.castParams(dialect)),
flattenParamPuts(flattened),
fetchSize,
queryTimeoutSeconds,
fileName,
lineNum,
qr
)
}
def runRaw[R](
sql: String,
variables: Seq[Any] = Nil,
fetchSize: Int = -1,
queryTimeoutSeconds: Int = -1
)(
implicit qr: Queryable.Row[?, R],
fileName: sourcecode.FileName,
lineNum: sourcecode.Line
): IndexedSeq[R] = {
streamRaw(sql, variables, fetchSize, queryTimeoutSeconds).toVector
}
def streamRaw[R](
sql: String,
variables: Seq[Any] = Nil,
fetchSize: Int = -1,
queryTimeoutSeconds: Int = -1
)(
implicit qr: Queryable.Row[?, R],
fileName: sourcecode.FileName,
lineNum: sourcecode.Line
): Generator[R] = {
streamRaw0[R](
construct = qr.construct,
sql,
anySeqPuts(variables),
fetchSize,
queryTimeoutSeconds,
fileName,
lineNum
)
}
def updateRaw(
sql: String,
variables: Seq[Any] = Nil,
fetchSize: Int = -1,
queryTimeoutSeconds: Int = -1
)(implicit fileName: sourcecode.FileName, lineNum: sourcecode.Line): Int = runRawUpdate0(
sql,
anySeqPuts(variables),
fetchSize,
queryTimeoutSeconds,
fileName,
lineNum
)
def updateGetGeneratedKeysRaw[R](
sql: String,
variables: Seq[Any] = Nil,
fetchSize: Int = -1,
queryTimeoutSeconds: Int = -1
)(
implicit qr: Queryable.Row[?, R],
fileName: sourcecode.FileName,
lineNum: sourcecode.Line
): IndexedSeq[R] = runRawUpdateGetGeneratedKeys0(
sql,
anySeqPuts(variables),
fetchSize,
queryTimeoutSeconds,
fileName,
lineNum,
qr
)
def streamFlattened0[R](
construct: Queryable.ResultSetIterator => R,
flattened: SqlStr.Flattened,
fetchSize: Int,
queryTimeoutSeconds: Int,
fileName: sourcecode.FileName,
lineNum: sourcecode.Line
) = streamRaw0(
construct,
flattened.renderSql(DialectConfig.castParams(dialect)),
flattenParamPuts(flattened),
fetchSize,
queryTimeoutSeconds,
fileName,
lineNum
)
def streamRaw0[R](
construct: Queryable.ResultSetIterator => R,
sql: String,
variables: Seq[(PreparedStatement, Int) => Unit],
fetchSize: Int,
queryTimeoutSeconds: Int,
fileName: sourcecode.FileName,
lineNum: sourcecode.Line
) = new Generator[R] {
def generate(handleItem: R => Generator.Action): Generator.Action = {
val statement = connection.prepareStatement(sql)
for ((setVariable, i) <- variables.iterator.zipWithIndex) setVariable(statement, i + 1)
configureRunCloseStatement(
statement,
fetchSize,
queryTimeoutSeconds,
sql,
fileName,
lineNum
) { stmt =>
val resultSet = stmt.executeQuery()
var action: Generator.Action = Generator.Continue
while (resultSet.next() && action == Generator.Continue) {
val rowRes = construct(new Queryable.ResultSetIterator(resultSet))
action = handleItem(rowRes)
}
action
}
}
}
def runRawUpdate0(
sql: String,
variables: Seq[(PreparedStatement, Int) => Unit],
fetchSize: Int,
queryTimeoutSeconds: Int,
fileName: sourcecode.FileName,
lineNum: sourcecode.Line
): Int = {
// Sqlite and HsqlExpr for some reason blow up if you try to do DDL
// like DROP TABLE or CREATE TABLE inside a prepared statement, so
// fall back to vanilla `createStatement`
if (variables.isEmpty) {
val statement = connection.createStatement()
configureRunCloseStatement(
statement,
fetchSize,
queryTimeoutSeconds,
sql,
fileName,
lineNum
)(_.executeUpdate(sql))
} else {
val statement = connection.prepareStatement(sql)
for ((v, i) <- variables.iterator.zipWithIndex) v(statement, i + 1)
configureRunCloseStatement(
statement,
fetchSize,
queryTimeoutSeconds,
sql,
fileName,
lineNum
)(_.executeUpdate())
}
}
def runRawUpdateGetGeneratedKeys0[R](
sql: String,
variables: Seq[(PreparedStatement, Int) => Unit],
fetchSize: Int,
queryTimeoutSeconds: Int,
fileName: sourcecode.FileName,
lineNum: sourcecode.Line,
qr: Queryable.Row[?, R]
): IndexedSeq[R] = {
val statement = connection.prepareStatement(sql, java.sql.Statement.RETURN_GENERATED_KEYS)
for ((v, i) <- variables.iterator.zipWithIndex) v(statement, i + 1)
configureRunCloseStatement(
statement,
fetchSize,
queryTimeoutSeconds,
sql,
fileName,
lineNum
) { stmt =>
stmt.executeUpdate()
val resultSet = stmt.getGeneratedKeys
val output = Vector.newBuilder[R]
while (resultSet.next()) {
val rowRes = qr.construct(new Queryable.ResultSetIterator(resultSet))
output.addOne(rowRes)
}
output.result()
}
}
def configureRunCloseStatement[P <: Statement, T](
statement: P,
fetchSize: Int,
queryTimeoutSeconds: Int,
sql: String,
fileName: sourcecode.FileName,
lineNum: sourcecode.Line
)(f: P => T): T = {
if (autoCommit) connection.setAutoCommit(true)
Seq(fetchSize, config.defaultFetchSize).find(_ != -1).foreach(statement.setFetchSize)
Seq(queryTimeoutSeconds, config.defaultQueryTimeoutSeconds)
.find(_ != -1)
.foreach(statement.setQueryTimeout)
config.logSql(sql, fileName.value, lineNum.value)
try f(statement)
finally statement.close()
}
def renderSql[Q, R](query: Q, castParams: Boolean = false)(
implicit qr: Queryable[Q, R]
): String = {
DbApi.renderSql(query, config, castParams)
}
val savepointStack = collection.mutable.ArrayDeque.empty[java.sql.Savepoint]
def savepoint[T](block: DbApi.Savepoint => T): T = {
val savepoint = connection.setSavepoint()
savepointStack.append(savepoint)
try {
val res = block(new DbApi.SavepointImpl(savepoint, () => rollbackSavepoint(savepoint)))
if (savepointStack.lastOption.exists(_ eq savepoint)) {
// Only release if this savepoint has not been rolled back,
// directly or indirectly
connection.releaseSavepoint(savepoint)
}
res
} catch {
case e: Throwable =>
rollbackSavepoint(savepoint)
throw e
}
}
// Make sure we keep track of what savepoints are active on the stack, so we do
// not release or rollback the same savepoint multiple times even in the case of
// exceptions or explicit rollbacks
def rollbackSavepoint(savepoint: java.sql.Savepoint) = {
savepointStack.indexOf(savepoint) match {
case -1 => // do nothing
case savepointIndex =>
connection.rollback(savepointStack(savepointIndex))
savepointStack.takeInPlace(savepointIndex)
}
}
def rollback() = {
savepointStack.clear()
rollBack0()
}
private def cast[T](t: Any): T = t.asInstanceOf[T]
private def flattenParamPuts[T](flattened: SqlStr.Flattened) = {
flattened.interpsIterator.map(v => (s, n) => v.mappedType.put(s, n, cast(v.value))).toSeq
}
private def anySeqPuts(variables: Seq[Any]) = {
variables.map(v => (s: PreparedStatement, n: Int) => s.setObject(n, v))
}
def close() = connection.close()
}
class SavepointImpl(savepoint: java.sql.Savepoint, rollback0: () => Unit) extends Savepoint {
def savepointId = savepoint.getSavepointId
def savepointName = savepoint.getSavepointName
def rollback() = rollback0()
}
}
