diff --git a/build.gradle.kts b/build.gradle.kts
index 6f37a7e..98d00dd 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -18,8 +18,8 @@ dependencies {
     implementation("org.jetbrains.kotlin:kotlin-reflect:1.3.31")
     implementation("com.fasterxml.jackson.module:jackson-module-kotlin:2.9.9")
     implementation("com.fasterxml.jackson.datatype:jackson-datatype-joda:2.9.9")
-    implementation("com.github.jasync-sql:jasync-postgresql:0.9.53")
     implementation("org.slf4j:slf4j-api:1.7.26")
+    implementation("org.postgresql:postgresql:42.2.6")
 
     testImplementation("ch.qos.logback:logback-classic:1.2.3")
     testImplementation("ch.qos.logback:logback-core:1.2.3")
@@ -32,7 +32,7 @@ publishing {
     publications {
         create<MavenPublication>("maven") {
             groupId = "fr.postgresjson"
-            artifactId = "postgresjson"
+            artifactId = "postgresjson-jdbc"
             version = "0.1"
 
             from(components["java"])
diff --git a/src/main/kotlin/fr/postgresjson/connexion/Connection.kt b/src/main/kotlin/fr/postgresjson/connexion/Connection.kt
index cb47567..0a067d1 100644
--- a/src/main/kotlin/fr/postgresjson/connexion/Connection.kt
+++ b/src/main/kotlin/fr/postgresjson/connexion/Connection.kt
@@ -1,20 +1,17 @@
 package fr.postgresjson.connexion
 
 import com.fasterxml.jackson.core.type.TypeReference
-import com.github.jasync.sql.db.Connection
-import com.github.jasync.sql.db.QueryResult
-import com.github.jasync.sql.db.pool.ConnectionPool
-import com.github.jasync.sql.db.postgresql.PostgreSQLConnection
-import com.github.jasync.sql.db.postgresql.PostgreSQLConnectionBuilder
 import fr.postgresjson.entity.EntityI
 import fr.postgresjson.serializer.Serializer
 import fr.postgresjson.utils.LoggerDelegate
 import org.slf4j.Logger
-import java.util.concurrent.CompletableFuture
+import java.sql.DriverManager
+import java.sql.ResultSet
+import java.sql.Connection as JDBCConnection
 
-typealias SelectOneCallback<T> = QueryResult.(T?) -> Unit
-typealias SelectCallback<T> = QueryResult.(List<T>) -> Unit
-typealias SelectPaginatedCallback<T> = QueryResult.(Paginated<T>) -> Unit
+typealias SelectOneCallback<T> = ResultSet.(T?) -> Unit
+typealias SelectCallback<T> = ResultSet.(List<T>) -> Unit
+typealias SelectPaginatedCallback<T> = ResultSet.(Paginated<T>) -> Unit
 
 class Connection(
     private val database: String,
@@ -23,32 +20,34 @@ class Connection(
     private val host: String = "localhost",
     private val port: Int = 5432
 ): Executable {
-    private lateinit var connection: ConnectionPool<PostgreSQLConnection>
+    private lateinit var connection: JDBCConnection
     private val serializer = Serializer()
     private val logger: Logger? by LoggerDelegate()
 
-    internal fun connect(): ConnectionPool<PostgreSQLConnection> {
-        if (!::connection.isInitialized || !connection.isConnected()) {
-            connection = PostgreSQLConnectionBuilder.createConnectionPool(
-                "jdbc:postgresql://$host:$port/$database?user=$username&password=$password"
-            )
+    internal fun connect(): JDBCConnection {
+        if (!::connection.isInitialized || connection.isClosed) {
+            connection = DriverManager.getConnection("jdbc:postgresql://$host:$port/$database", username, password)
         }
         return connection
     }
 
-    fun <A> inTransaction(f: (Connection) -> CompletableFuture<A>) = connect().inTransaction(f)
+    fun <T> inTransaction(f: (Connection) -> T) {
+        sendQuery("BEGIN")
+        f(this)
+        sendQuery("COMMIT")
+    }
 
     override fun <R: EntityI<*>> select(
         sql: String,
         typeReference: TypeReference<R>,
         values: List<Any?>,
-        block: (QueryResult, R?) -> Unit
+        block: (ResultSet, R?) -> Unit
     ): R? {
         val primaryObject = values.firstOrNull {
             it is EntityI<*> && typeReference.type.typeName == it::class.java.name
         } as R?
         val result = exec(sql, compileArgs(values))
-        val json = result.rows[0].getString(0)
+        val json = result.getString(1)
         return if (json === null) {
             null
         } else {
@@ -73,7 +72,7 @@ class Connection(
         sql: String,
         typeReference: TypeReference<R>,
         values: Map<String, Any?>,
-        block: (QueryResult, R?) -> Unit
+        block: (ResultSet, R?) -> Unit
     ): R? {
         return replaceArgs(sql, values) {
             select(this.sql, typeReference, this.parameters, block)
@@ -91,10 +90,10 @@ class Connection(
         sql: String,
         typeReference: TypeReference<List<R>>,
         values: List<Any?>,
-        block: (QueryResult, List<R>) -> Unit
+        block: (ResultSet, List<R>) -> Unit
     ): List<R> {
         val result = exec(sql, compileArgs(values))
-        val json = result.rows[0].getString(0)
+        val json = result.getString(1)
         return if (json === null) {
             listOf<EntityI<*>>() as List<R>
         } else {
@@ -117,7 +116,7 @@ class Connection(
         limit: Int,
         typeReference: TypeReference<List<R>>,
         values: Map<String, Any?>,
-        block: (QueryResult, Paginated<R>) -> Unit
+        block: (ResultSet, Paginated<R>) -> Unit
     ): Paginated<R> {
         val offset = (page - 1) * limit
         val newValues = values
@@ -125,11 +124,11 @@ class Connection(
             .plus("limit" to limit)
 
         val line = replaceArgs(sql, newValues) {
-            exec(this.sql, compileArgs(this.parameters))
+            exec(this.sql, this.parameters)
         }
 
         return line.run {
-            val json = rows[0].getString(0)
+            val json = getString(1)
             val entities = if (json === null) {
                 listOf<EntityI<*>>() as List<R>
             } else {
@@ -139,7 +138,7 @@ class Connection(
                 entities,
                 offset,
                 limit,
-                rows[0].getInt("total") ?: error("The query not return total")
+                getInt("total")
             )
         }.also {
             block(line, it)
@@ -159,7 +158,7 @@ class Connection(
         sql: String,
         typeReference: TypeReference<List<R>>,
         values: Map<String, Any?>,
-        block: (QueryResult, List<R>) -> Unit
+        block: (ResultSet, List<R>) -> Unit
     ): List<R> {
         return replaceArgs(sql, values) {
             select(this.sql, typeReference, this.parameters, block)
@@ -173,21 +172,37 @@ class Connection(
     ): List<R> =
         select(sql, object: TypeReference<List<R>>() {}, values, block)
 
-    override fun exec(sql: String, values: List<Any?>): QueryResult {
+    override fun exec(sql: String, values: List<Any?>): ResultSet {
         return stopwatchQuery(sql, values) {
-            connect().sendPreparedStatement(sql, compileArgs(values)).join()
+            connect().prepareStatement(sql).apply {
+                compileArgs(values).forEachIndexed { i, v ->
+                    when (v) {
+                        is String  -> setString(i+1, v)
+                        is Int  -> setInt(i+1, v)
+                        else -> setString(i+1, v.toString())
+                    }
+                }
+            }.executeQuery().apply { next() }
         }
     }
 
-    override fun exec(sql: String, values: Map<String, Any?>): QueryResult {
+    override fun exec(sql: String, values: Map<String, Any?>): ResultSet {
         return replaceArgs(sql, values) {
             exec(this.sql, this.parameters)
         }
     }
 
-    override fun sendQuery(sql: String): QueryResult {
-        return stopwatchQuery(sql) {
-            connect().sendQuery(sql).join()
+    override fun sendQuery(sql: String, values: List<Any?>): Int {
+        return stopwatchQuery(sql, values) {
+            connect().prepareStatement(sql).apply {
+                compileArgs(values).forEachIndexed { i, v ->
+                    when (v) {
+                        is String  -> setString(i+1, v)
+                        is Int  -> setInt(i+1, v)
+                        else -> setString(i+1, v.toString())
+                    }
+                }
+            }.executeUpdate()
         }
     }
 
diff --git a/src/main/kotlin/fr/postgresjson/connexion/EmbedExecutable.kt b/src/main/kotlin/fr/postgresjson/connexion/EmbedExecutable.kt
index 59437c8..7a22d82 100644
--- a/src/main/kotlin/fr/postgresjson/connexion/EmbedExecutable.kt
+++ b/src/main/kotlin/fr/postgresjson/connexion/EmbedExecutable.kt
@@ -1,8 +1,8 @@
 package fr.postgresjson.connexion
 
 import com.fasterxml.jackson.core.type.TypeReference
-import com.github.jasync.sql.db.QueryResult
 import fr.postgresjson.entity.EntityI
+import java.sql.ResultSet
 
 interface EmbedExecutable {
     val connection: Connection
@@ -47,6 +47,6 @@ interface EmbedExecutable {
         block: SelectPaginatedCallback<R> = {}
     ): Paginated<R>
 
-    fun exec(values: List<Any?> = emptyList()): QueryResult
-    fun exec(values: Map<String, Any?>): QueryResult
+    fun exec(values: List<Any?> = emptyList()): ResultSet
+    fun exec(values: Map<String, Any?>): ResultSet
 }
\ No newline at end of file
diff --git a/src/main/kotlin/fr/postgresjson/connexion/Executable.kt b/src/main/kotlin/fr/postgresjson/connexion/Executable.kt
index 08daedd..fefac71 100644
--- a/src/main/kotlin/fr/postgresjson/connexion/Executable.kt
+++ b/src/main/kotlin/fr/postgresjson/connexion/Executable.kt
@@ -1,8 +1,8 @@
 package fr.postgresjson.connexion
 
 import com.fasterxml.jackson.core.type.TypeReference
-import com.github.jasync.sql.db.QueryResult
 import fr.postgresjson.entity.EntityI
+import java.sql.ResultSet
 
 interface Executable {
     /* Select One */
@@ -48,7 +48,7 @@ interface Executable {
         block: SelectPaginatedCallback<R> = {}
     ): Paginated<R>
 
-    fun exec(sql: String, values: List<Any?> = emptyList()): QueryResult
-    fun exec(sql: String, values: Map<String, Any?>): QueryResult
-    fun sendQuery(sql: String): QueryResult
+    fun exec(sql: String, values: List<Any?> = emptyList()): ResultSet
+    fun exec(sql: String, values: Map<String, Any?>): ResultSet
+    fun sendQuery(sql: String, values: List<Any?> = emptyList()): Int
 }
\ No newline at end of file
diff --git a/src/main/kotlin/fr/postgresjson/connexion/Function.kt b/src/main/kotlin/fr/postgresjson/connexion/Function.kt
index 4d42538..fab6597 100644
--- a/src/main/kotlin/fr/postgresjson/connexion/Function.kt
+++ b/src/main/kotlin/fr/postgresjson/connexion/Function.kt
@@ -1,9 +1,9 @@
 package fr.postgresjson.connexion
 
 import com.fasterxml.jackson.core.type.TypeReference
-import com.github.jasync.sql.db.QueryResult
 import fr.postgresjson.definition.Function
 import fr.postgresjson.entity.EntityI
+import java.sql.ResultSet
 
 class Function(val definition: Function, override val connection: Connection): EmbedExecutable {
     override fun toString(): String {
@@ -20,7 +20,7 @@ class Function(val definition: Function, override val connection: Connection): E
     override fun <R: EntityI<*>> select(
         typeReference: TypeReference<R>,
         values: List<Any?>,
-        block: (QueryResult, R?) -> Unit
+        block: (ResultSet, R?) -> Unit
     ): R? {
         val args = compileArgs(values)
         val sql = "SELECT * FROM ${definition.name} ($args)"
@@ -46,7 +46,7 @@ class Function(val definition: Function, override val connection: Connection): E
     override fun <R: EntityI<*>> select(
         typeReference: TypeReference<R>,
         values: Map<String, Any?>,
-        block: (QueryResult, R?) -> Unit
+        block: (ResultSet, R?) -> Unit
     ): R? {
         val args = compileArgs(values)
         val sql = "SELECT * FROM ${definition.name} ($args)"
@@ -74,7 +74,7 @@ class Function(val definition: Function, override val connection: Connection): E
     override fun <R: EntityI<*>> select(
         typeReference: TypeReference<List<R>>,
         values: List<Any?>,
-        block: (QueryResult, List<R>) -> Unit
+        block: (ResultSet, List<R>) -> Unit
     ): List<R> {
         val args = compileArgs(values)
         val sql = "SELECT * FROM ${definition.name} ($args)"
@@ -94,7 +94,7 @@ class Function(val definition: Function, override val connection: Connection): E
     override fun <R: EntityI<*>> select(
         typeReference: TypeReference<List<R>>,
         values: Map<String, Any?>,
-        block: (QueryResult, List<R>) -> Unit
+        block: (ResultSet, List<R>) -> Unit
     ): List<R> {
         val args = compileArgs(values)
         val sql = "SELECT * FROM ${definition.name} ($args)"
@@ -124,7 +124,7 @@ class Function(val definition: Function, override val connection: Connection): E
         limit: Int,
         typeReference: TypeReference<List<R>>,
         values: Map<String, Any?>,
-        block: (QueryResult, Paginated<R>) -> Unit
+        block: (ResultSet, Paginated<R>) -> Unit
     ): Paginated<R> {
         val offset = (page - 1) * limit
         val newValues = values
@@ -155,14 +155,14 @@ class Function(val definition: Function, override val connection: Connection): E
 
     /* Execute function without traitements */
 
-    override fun exec(values: List<Any?>): QueryResult {
+    override fun exec(values: List<Any?>): ResultSet {
         val args = compileArgs(values)
         val sql = "SELECT * FROM ${definition.name} ($args)"
 
         return connection.exec(sql, values)
     }
 
-    override fun exec(values: Map<String, Any?>): QueryResult {
+    override fun exec(values: Map<String, Any?>): ResultSet {
         val args = compileArgs(values)
         val sql = "SELECT * FROM ${definition.name} ($args)"
 
diff --git a/src/main/kotlin/fr/postgresjson/connexion/Paginated.kt b/src/main/kotlin/fr/postgresjson/connexion/Paginated.kt
index cb6d21f..9b00544 100644
--- a/src/main/kotlin/fr/postgresjson/connexion/Paginated.kt
+++ b/src/main/kotlin/fr/postgresjson/connexion/Paginated.kt
@@ -1,6 +1,5 @@
 package fr.postgresjson.connexion
 
-import com.github.jasync.sql.db.util.length
 import fr.postgresjson.entity.EntityI
 
 data class Paginated<T: EntityI<*>>(
@@ -10,7 +9,7 @@ data class Paginated<T: EntityI<*>>(
     val total: Int
 ) {
     val currentPage: Int = (offset / limit) + 1
-    val count: Int = result.length
+    val count: Int = result.size
 
     init {
         if (offset < 0) error("offset must be greather or equal than 0")
diff --git a/src/main/kotlin/fr/postgresjson/connexion/Query.kt b/src/main/kotlin/fr/postgresjson/connexion/Query.kt
index 5bdce80..5dff06a 100644
--- a/src/main/kotlin/fr/postgresjson/connexion/Query.kt
+++ b/src/main/kotlin/fr/postgresjson/connexion/Query.kt
@@ -1,8 +1,8 @@
 package fr.postgresjson.connexion
 
 import com.fasterxml.jackson.core.type.TypeReference
-import com.github.jasync.sql.db.QueryResult
 import fr.postgresjson.entity.EntityI
+import java.sql.ResultSet
 
 
 class Query(override val name: String, private val sql: String, override val connection: Connection): EmbedExecutable {
@@ -15,7 +15,7 @@ class Query(override val name: String, private val sql: String, override val con
     override fun <R: EntityI<*>> select(
         typeReference: TypeReference<R>,
         values: List<Any?>,
-        block: (QueryResult, R?) -> Unit
+        block: (ResultSet, R?) -> Unit
     ): R? {
         return connection.select(this.toString(), typeReference, values, block)
     }
@@ -29,7 +29,7 @@ class Query(override val name: String, private val sql: String, override val con
     override fun <R: EntityI<*>> select(
         typeReference: TypeReference<R>,
         values: Map<String, Any?>,
-        block: (QueryResult, R?) -> Unit
+        block: (ResultSet, R?) -> Unit
     ): R? {
         return connection.select(this.toString(), typeReference, values, block)
     }
@@ -45,7 +45,7 @@ class Query(override val name: String, private val sql: String, override val con
     override fun <R: EntityI<*>> select(
         typeReference: TypeReference<List<R>>,
         values: List<Any?>,
-        block: (QueryResult, List<R>) -> Unit
+        block: (ResultSet, List<R>) -> Unit
     ): List<R> {
         return connection.select(this.toString(), typeReference, values, block)
     }
@@ -59,7 +59,7 @@ class Query(override val name: String, private val sql: String, override val con
     override fun <R: EntityI<*>> select(
         typeReference: TypeReference<List<R>>,
         values: Map<String, Any?>,
-        block: (QueryResult, List<R>) -> Unit
+        block: (ResultSet, List<R>) -> Unit
     ): List<R> {
         return connection.select(this.toString(), typeReference, values, block)
     }
@@ -75,7 +75,7 @@ class Query(override val name: String, private val sql: String, override val con
         limit: Int,
         typeReference: TypeReference<List<R>>,
         values: Map<String, Any?>,
-        block: (QueryResult, Paginated<R>) -> Unit
+        block: (ResultSet, Paginated<R>) -> Unit
     ): Paginated<R> {
         return connection.select(this.toString(), page, limit, typeReference, values, block)
     }
@@ -92,11 +92,11 @@ class Query(override val name: String, private val sql: String, override val con
 
     /* Execute function without traitements */
 
-    override fun exec(values: List<Any?>): QueryResult {
+    override fun exec(values: List<Any?>): ResultSet {
         return connection.exec(sql, values)
     }
 
-    override fun exec(values: Map<String, Any?>): QueryResult {
+    override fun exec(values: Map<String, Any?>): ResultSet {
         return connection.exec(sql, values)
     }
 }
\ No newline at end of file
diff --git a/src/main/kotlin/fr/postgresjson/migration/Function.kt b/src/main/kotlin/fr/postgresjson/migration/Function.kt
index 2078521..7023eed 100644
--- a/src/main/kotlin/fr/postgresjson/migration/Function.kt
+++ b/src/main/kotlin/fr/postgresjson/migration/Function.kt
@@ -59,7 +59,7 @@ data class Function(
             up()
             down()
             it.sendQuery("ROLLBACK")
-        }.join()
+        }
 
         return Status.OK // TODO
     }
@@ -69,7 +69,7 @@ data class Function(
             up()
             down()
             it.sendQuery("ROLLBACK")
-        }.join()
+        }
 
         return Status.OK // TODO
     }
diff --git a/src/main/kotlin/fr/postgresjson/migration/Migrations.kt b/src/main/kotlin/fr/postgresjson/migration/Migrations.kt
index 87dfc69..76db617 100644
--- a/src/main/kotlin/fr/postgresjson/migration/Migrations.kt
+++ b/src/main/kotlin/fr/postgresjson/migration/Migrations.kt
@@ -1,7 +1,6 @@
 package fr.postgresjson.migration
 
 import com.fasterxml.jackson.core.type.TypeReference
-import com.github.jasync.sql.db.util.size
 import fr.postgresjson.connexion.Connection
 import fr.postgresjson.definition.Function.FunctionNotFound
 import fr.postgresjson.entity.Entity
@@ -97,11 +96,11 @@ data class Migrations private constructor(
             it.isFile
         }.forEach { file ->
             if (file.name.endsWith(".up.sql")) {
-                file.path.substring(0, file.path.size - 7).let {
+                file.path.substring(0, file.path.length - 7).let {
                     try {
                         val down = File("$it.down.sql").readText()
                         val up = file.readText()
-                        val name = file.name.substring(0, file.name.size - 7)
+                        val name = file.name.substring(0, file.name.length - 7)
                         addQuery(name, up, down)
                     } catch (e: FileNotFoundException) {
                         throw DownMigrationNotDefined("$it.down.sql", e)
diff --git a/src/main/kotlin/fr/postgresjson/migration/Query.kt b/src/main/kotlin/fr/postgresjson/migration/Query.kt
index 673d994..040b0de 100644
--- a/src/main/kotlin/fr/postgresjson/migration/Query.kt
+++ b/src/main/kotlin/fr/postgresjson/migration/Query.kt
@@ -31,7 +31,7 @@ data class Query(
         connection.sendQuery(down)
 
         this::class.java.classLoader.getResource("sql/migration/deleteHistory.sql")!!.readText().let {
-            connection.exec(it, listOf(name))
+            connection.sendQuery(it, listOf(name))
         }
 
         return Migration.Status.OK
@@ -42,7 +42,7 @@ data class Query(
             up()
             down()
             it.sendQuery("ROLLBACK")
-        }.join()
+        }
 
         return Migration.Status.OK // TODO
     }
@@ -52,7 +52,7 @@ data class Query(
             up()
             down()
             it.sendQuery("ROLLBACK")
-        }.join()
+        }
 
         return Migration.Status.OK // TODO
     }
diff --git a/src/test/kotlin/fr/postgresjson/ConnectionTest.kt b/src/test/kotlin/fr/postgresjson/ConnectionTest.kt
index e07fdbb..232b568 100644
--- a/src/test/kotlin/fr/postgresjson/ConnectionTest.kt
+++ b/src/test/kotlin/fr/postgresjson/ConnectionTest.kt
@@ -72,7 +72,7 @@ class ConnectionTest(): TestAbstract() {
     fun callExec() {
         val o = ObjTest("myName")
         val result = connection.exec("select json_build_object('id', 1, 'name', ?::json->>'name')", listOf(o))
-        Assertions.assertEquals(1, result.rowsAffected)
+        Assertions.assertNotNull(result.getString(1))
     }
 
     @Test
@@ -166,7 +166,7 @@ class ConnectionTest(): TestAbstract() {
             params
         ) {
             assertEquals("ff", it!!.first)
-            assertEquals("plop", rows[0].getString("other"))
+            assertEquals("plop", getString("other"))
         }
         assertNotNull(result)
         assertEquals("ff", result!!.first)
diff --git a/src/test/kotlin/fr/postgresjson/RequesterTest.kt b/src/test/kotlin/fr/postgresjson/RequesterTest.kt
index 050647f..f4d58ea 100644
--- a/src/test/kotlin/fr/postgresjson/RequesterTest.kt
+++ b/src/test/kotlin/fr/postgresjson/RequesterTest.kt
@@ -4,6 +4,7 @@ import fr.postgresjson.connexion.Paginated
 import fr.postgresjson.connexion.Requester
 import fr.postgresjson.entity.IdEntity
 import org.junit.Assert
+import org.junit.jupiter.api.Assertions
 import org.junit.jupiter.api.Assertions.assertEquals
 import org.junit.jupiter.api.Test
 import java.io.File
@@ -43,7 +44,7 @@ class RequesterTest: TestAbstract() {
             .getQuery("Test/selectOne")
             .exec()
 
-        assertEquals(1, result.rowsAffected)
+        Assertions.assertNotNull(result.getString(1))
     }
 
     @Test
@@ -54,7 +55,7 @@ class RequesterTest: TestAbstract() {
             .getFunction("test_function")
             .exec(listOf("test", "plip"))
 
-        assertEquals(1, result.rowsAffected)
+        Assertions.assertNotNull(result.getString(1))
     }
 
     @Test
@@ -139,7 +140,7 @@ class RequesterTest: TestAbstract() {
             .getQuery("Test/selectOneWithParameters")
             .selectOne(mapOf("name" to "myName")) {
                 assertEquals("myName", it!!.name)
-                Assert.assertEquals("plop", rows[0].getString("other"))
+                Assert.assertEquals("plop", getString("other"))
             }!!
 
         assertEquals("myName", obj.name)
diff --git a/src/test/kotlin/fr/postgresjson/TestAbstract.kt b/src/test/kotlin/fr/postgresjson/TestAbstract.kt
index 7120a09..96394d2 100644
--- a/src/test/kotlin/fr/postgresjson/TestAbstract.kt
+++ b/src/test/kotlin/fr/postgresjson/TestAbstract.kt
@@ -9,20 +9,22 @@ import java.io.File
 
 @TestInstance(PER_CLASS)
 abstract class TestAbstract {
+    private var connection = Connection(database = "test", username = "test", password = "test")
+
     protected fun getConnextion(): Connection {
-        return Connection(database = "test", username = "test", password = "test")
+        return connection
     }
 
     @BeforeEach
     fun beforeAll() {
         val initSQL = File(this::class.java.getResource("/fixtures/init.sql").toURI())
-        val promise = getConnextion().connect().sendQuery(initSQL.readText())
-        promise.join()
+        getConnextion().connect().createStatement().executeUpdate(initSQL.readText())
     }
 
     @AfterEach
     fun afterAll() {
         val downSQL = File(this::class.java.getResource("/fixtures/down.sql").toURI())
-        getConnextion().connect().sendQuery(downSQL.readText()).join()
+        getConnextion().connect().createStatement().executeUpdate(downSQL.readText())
+        getConnextion().connect().close()
     }
 }
\ No newline at end of file
diff --git a/src/test/resources/sql/migration_without_down/1.up.sql b/src/test/resources/sql/migration_without_down/1.up.sql
index 027b7d6..89ac949 100644
--- a/src/test/resources/sql/migration_without_down/1.up.sql
+++ b/src/test/resources/sql/migration_without_down/1.up.sql
@@ -1 +1,5 @@
-SELECT 1;
\ No newline at end of file
+do $$
+    begin
+        PERFORM 1;
+    end;
+$$
diff --git a/src/test/resources/sql/migrations/1.down.sql b/src/test/resources/sql/migrations/1.down.sql
index 027b7d6..1274bc7 100644
--- a/src/test/resources/sql/migrations/1.down.sql
+++ b/src/test/resources/sql/migrations/1.down.sql
@@ -1 +1,5 @@
-SELECT 1;
\ No newline at end of file
+do $$
+    begin
+        PERFORM 1;
+    end;
+$$
\ No newline at end of file
diff --git a/src/test/resources/sql/migrations/1.up.sql b/src/test/resources/sql/migrations/1.up.sql
index 027b7d6..1274bc7 100644
--- a/src/test/resources/sql/migrations/1.up.sql
+++ b/src/test/resources/sql/migrations/1.up.sql
@@ -1 +1,5 @@
-SELECT 1;
\ No newline at end of file
+do $$
+    begin
+        PERFORM 1;
+    end;
+$$
\ No newline at end of file