adds first version of oids schema algo

src/main/kotlin/unibz.cs.semint.kprime/domain/ddl/schemalgo/oids.kt

@@ -8,9 +8,12 @@ fun oid(schema: Schema, originTableName: String): List<String> {
         val originTable = schema.table(originTableName)
         val originTableKey = schema.key(originTableName)
         // adds one column autoincrement
-        
+        sqlCommands.add("ALTER TABLE $originTableName ADD COLUMN sid int NOT NULL auto_increment UNIQUE")
         // create a key-table with projection of oid and pk
-        // search ftables with foreign keys as pk
+        val keyCols = originTableKey.map { c -> c.name }.joinToString(",")
+        sqlCommands.add("CREATE TABLE SKEY$originTableName AS SELECT sid,$keyCols FROM $originTableName")
+        sqlCommands.add("ALTER TABLE $originTableName DROP COLUMN $keyCols")
+        // search ftables with foreign keys od double-inc as pk
         // for each ftable adds one column oid with join with corresponding to fkey values
         // replace pk origin-table
         // replace fks to new surrogate id column

src/test/kotlin/unibz.cs.semint.kprime/domain/schemalgo/OidsTest.kt

@@ -3,6 +3,7 @@ package unibz.cs.semint.kprime.domain.schemalgo
 import org.junit.Test
 import unibz.cs.semint.kprime.domain.ddl.Schema
 import unibz.cs.semint.kprime.domain.ddl.schemalgo.oid
+import kotlin.test.assertEquals
 
 class OidsTest {
 
@@ -10,8 +11,14 @@ class OidsTest {
     fun test_oid_addition_single_table() {
         // given
         val schema = Schema()
-        val originTableName = ""
+        schema.addTable("person:name,surname,address")
+        schema.addKey("person:name,surname")
+        val originTableName = "person"
         // when
-        oid(schema,originTableName)
+        val sqlCommands = oid(schema, originTableName)
+        // then
+        assertEquals("ALTER TABLE person ADD COLUMN sid int NOT NULL auto_increment UNIQUE",sqlCommands[0])
+        assertEquals("CREATE TABLE SKEYperson AS SELECT sid,surname,name FROM person",sqlCommands[1])
+        assertEquals("ALTER TABLE person DROP COLUMN surname,name",sqlCommands[2])
     }
 }
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