/
Database.kt
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/
Database.kt
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package org.jetbrains.exposed.sql
import org.jetbrains.annotations.TestOnly
import org.jetbrains.exposed.sql.statements.api.ExposedConnection
import org.jetbrains.exposed.sql.statements.api.ExposedDatabaseMetadata
import org.jetbrains.exposed.sql.transactions.ThreadLocalTransactionManager
import org.jetbrains.exposed.sql.transactions.TransactionManager
import org.jetbrains.exposed.sql.vendors.*
import java.math.BigDecimal
import java.sql.Connection
import java.sql.DriverManager
import java.util.*
import java.util.concurrent.ConcurrentHashMap
import javax.sql.ConnectionPoolDataSource
import javax.sql.DataSource
class Database private constructor(
private val resolvedVendor: String? = null,
val config: DatabaseConfig,
val connector: () -> ExposedConnection<*>
) {
var useNestedTransactions: Boolean = config.useNestedTransactions
@Deprecated("Use DatabaseConfig to define the useNestedTransactions")
@TestOnly
set
internal fun <T> metadata(body: ExposedDatabaseMetadata.() -> T): T {
val transaction = TransactionManager.currentOrNull()
return if (transaction == null) {
val connection = connector()
try {
connection.metadata(body)
} finally {
connection.close()
}
} else {
transaction.connection.metadata(body)
}
}
val url: String by lazy { metadata { url } }
val vendor: String by lazy {
resolvedVendor ?: metadata { databaseDialectName }
}
val dialect by lazy {
config.explicitDialect ?: dialects[vendor.lowercase()]?.invoke() ?: error("No dialect registered for $name. URL=$url")
}
val version by lazy { metadata { version } }
fun isVersionCovers(version: BigDecimal) = this.version >= version
val supportsAlterTableWithAddColumn by lazy(LazyThreadSafetyMode.NONE) { metadata { supportsAlterTableWithAddColumn } }
val supportsMultipleResultSets by lazy(LazyThreadSafetyMode.NONE) { metadata { supportsMultipleResultSets } }
val identifierManager by lazy { metadata { identifierManager } }
var defaultFetchSize: Int? = config.defaultFetchSize
private set
@Deprecated("Use DatabaseConfig to define the defaultFetchSize")
@TestOnly
fun defaultFetchSize(size: Int): Database {
defaultFetchSize = size
return this
}
companion object {
internal val dialects = ConcurrentHashMap<String, () -> DatabaseDialect>()
private val connectionInstanceImpl: DatabaseConnectionAutoRegistration =
ServiceLoader.load(DatabaseConnectionAutoRegistration::class.java, Database::class.java.classLoader).firstOrNull()
?: error("Can't load implementation for ${DatabaseConnectionAutoRegistration::class.simpleName}")
private val driverMapping = mutableMapOf(
"jdbc:h2" to "org.h2.Driver",
"jdbc:postgresql" to "org.postgresql.Driver",
"jdbc:pgsql" to "com.impossibl.postgres.jdbc.PGDriver",
"jdbc:mysql" to "com.mysql.cj.jdbc.Driver",
"jdbc:mariadb" to "org.mariadb.jdbc.Driver",
"jdbc:oracle" to "oracle.jdbc.OracleDriver",
"jdbc:sqlite" to "org.sqlite.JDBC",
"jdbc:sqlserver" to "com.microsoft.sqlserver.jdbc.SQLServerDriver"
)
private val dialectMapping = mutableMapOf(
"jdbc:h2" to H2Dialect.dialectName,
"jdbc:postgresql" to PostgreSQLDialect.dialectName,
"jdbc:pgsql" to PostgreSQLNGDialect.dialectName,
"jdbc:mysql" to MysqlDialect.dialectName,
"jdbc:mariadb" to MariaDBDialect.dialectName,
"jdbc:oracle" to OracleDialect.dialectName,
"jdbc:sqlite" to SQLiteDialect.dialectName,
"jdbc:sqlserver" to SQLServerDialect.dialectName
)
init {
registerDialect(H2Dialect.dialectName) { H2Dialect() }
registerDialect(MysqlDialect.dialectName) { MysqlDialect() }
registerDialect(PostgreSQLDialect.dialectName) { PostgreSQLDialect() }
registerDialect(PostgreSQLNGDialect.dialectName) { PostgreSQLNGDialect() }
registerDialect(SQLiteDialect.dialectName) { SQLiteDialect() }
registerDialect(OracleDialect.dialectName) { OracleDialect() }
registerDialect(SQLServerDialect.dialectName) { SQLServerDialect() }
registerDialect(MariaDBDialect.dialectName) { MariaDBDialect() }
}
fun registerDialect(prefix: String, dialect: () -> DatabaseDialect) {
dialects[prefix] = dialect
}
fun registerJdbcDriver(prefix: String, driverClassName: String, dialect: String) {
driverMapping[prefix] = driverClassName
dialectMapping[prefix] = dialect
}
private fun doConnect(
explicitVendor: String?,
config: DatabaseConfig?,
getNewConnection: () -> Connection,
setupConnection: (Connection) -> Unit = {},
manager: (Database) -> TransactionManager = { ThreadLocalTransactionManager(it) }
): Database {
return Database(explicitVendor, config ?: DatabaseConfig.invoke()) {
connectionInstanceImpl(getNewConnection().apply { setupConnection(this) })
}.apply {
TransactionManager.registerManager(this, manager(this))
}
}
fun connect(
datasource: DataSource,
setupConnection: (Connection) -> Unit = {},
databaseConfig: DatabaseConfig? = null,
manager: (Database) -> TransactionManager = { ThreadLocalTransactionManager(it) }
): Database {
return doConnect(
explicitVendor = null,
config = databaseConfig,
getNewConnection = { datasource.connection!! },
setupConnection = setupConnection,
manager = manager
)
}
fun connectPool(
datasource: ConnectionPoolDataSource,
setupConnection: (Connection) -> Unit = {},
databaseConfig: DatabaseConfig? = null,
manager: (Database) -> TransactionManager = { ThreadLocalTransactionManager(it) }
): Database {
return doConnect(
explicitVendor = null,
config = databaseConfig,
getNewConnection = { datasource.pooledConnection.connection!! },
setupConnection = setupConnection,
manager = manager
)
}
fun connect(
getNewConnection: () -> Connection,
databaseConfig: DatabaseConfig? = null,
manager: (Database) -> TransactionManager = { ThreadLocalTransactionManager(it) }
): Database {
return doConnect(
explicitVendor = null,
config = databaseConfig,
getNewConnection = getNewConnection,
manager = manager
)
}
fun connect(
url: String,
driver: String = getDriver(url),
user: String = "",
password: String = "",
setupConnection: (Connection) -> Unit = {},
databaseConfig: DatabaseConfig? = null,
manager: (Database) -> TransactionManager = { ThreadLocalTransactionManager(it) }
): Database {
Class.forName(driver).getDeclaredConstructor().newInstance()
val dialectName = getDialectName(url) ?: error("Can't resolve dialect for connection: $url")
return doConnect(dialectName, databaseConfig, { DriverManager.getConnection(url, user, password) }, setupConnection, manager)
}
fun getDefaultIsolationLevel(db: Database): Int =
when (db.dialect) {
is SQLiteDialect -> Connection.TRANSACTION_SERIALIZABLE
is MysqlDialect -> Connection.TRANSACTION_REPEATABLE_READ
else -> Connection.TRANSACTION_READ_COMMITTED
}
private fun getDriver(url: String) = driverMapping.entries.firstOrNull { (prefix, _) ->
url.startsWith(prefix)
}?.value ?: error("Database driver not found for $url")
fun getDialectName(url: String) = dialectMapping.entries.firstOrNull { (prefix, _) ->
url.startsWith(prefix)
}?.value
}
}
interface DatabaseConnectionAutoRegistration : (Connection) -> ExposedConnection<*>
val Database.name: String get() = url.substringBefore('?').substringAfterLast('/')