Migration enum drop check constraints (#1435)

* Fix: apply drop checkConstraints properly which were not applied for Enum to String

* Use IF EXISTS to drop constraints

* added TODO and comment about MariaDB supporting CHECK constraints from version 10.2.1 forward compared to MySQL 5.7/8.0 parsing but ignoring CHECK constraints

* updated reference scripts for dropping constraints on enums

src/main/java/io/ebeaninternal/dbmigration/ddlgeneration/platform/BaseTableDdl.java

@@ -840,12 +840,15 @@ public class BaseTableDdl implements TableDdl {
     if (hasValue(alterColumn.getComment())) {
       alterColumnComment(writer, alterColumn);
     }
+    if (hasValue(alterColumn.getDropCheckConstraint())) {
+      dropCheckConstraint(writer, alterColumn, alterColumn.getDropCheckConstraint());
+    }
 
     boolean alterCheckConstraint = hasValue(alterColumn.getCheckConstraint());
 
     if (alterCheckConstraint) {
       // drop constraint before altering type etc
-      dropCheckConstraint(writer, alterColumn);
+      dropCheckConstraint(writer, alterColumn, alterColumn.getCheckConstraintName());
     }
     boolean alterBaseAttributes = false;
     if (hasValue(alterColumn.getType())) {
@@ -922,9 +925,9 @@ public class BaseTableDdl implements TableDdl {
     }
   }
 
-  protected void dropCheckConstraint(DdlWrite writer, AlterColumn alter) throws IOException {
+  protected void dropCheckConstraint(DdlWrite writer, AlterColumn alter, String constraintName) throws IOException {
 
-    String ddl = platformDdl.alterTableDropConstraint(alter.getTableName(), alter.getCheckConstraintName());
+    String ddl = platformDdl.alterTableDropConstraint(alter.getTableName(), constraintName);
     if (hasValue(ddl)) {
       writer.apply().append(ddl).endOfStatement();
     }

src/main/java/io/ebeaninternal/dbmigration/ddlgeneration/platform/MySqlDdl.java

@@ -40,7 +40,8 @@ public class MySqlDdl extends PlatformDdl {
 
   @Override
   public String alterTableDropConstraint(String tableName, String constraintName) {
-    // drop constraint not supported
+    // drop constraint not supported in MySQL 5.7 and 8.0 but starting with MariaDB 10.2.1 CHECK is evaluated
+    // TODO: Implement for MariaDB >= 10.2.1
     return null;
   }
 

src/main/java/io/ebeaninternal/dbmigration/ddlgeneration/platform/PlatformDdl.java

@@ -79,8 +79,6 @@ public class PlatformDdl {
 
   protected String alterColumn = "alter column";
 
-  protected String dropConstraint = "drop constraint";
-
   protected String dropUniqueConstraint = "drop constraint";
 
   protected String addConstraint = "add constraint";
@@ -420,7 +418,7 @@ public class PlatformDdl {
    * Drop a unique constraint from the table.
    */
   public String alterTableDropConstraint(String tableName, String constraintName) {
-    return "alter table " + tableName + " " + dropConstraint + " " + maxConstraintName(constraintName);
+    return "alter table " + tableName + " " + dropConstraintIfExists + " " + maxConstraintName(constraintName);
   }
 
   /**

src/test/java/io/ebeaninternal/dbmigration/DbMigrationTest.java

@@ -61,6 +61,7 @@ public class DbMigrationTest extends BaseTestCase {
         "migtest_ckey_detail",
         "migtest_ckey_parent",
         "migtest_e_basic",
+        "migtest_e_enum",
         "migtest_e_history",
         "migtest_e_history2",
         "migtest_e_history3",

src/test/java/io/ebeaninternal/dbmigration/ddlgeneration/platform/BaseTableDdlTest.java

@@ -41,7 +41,7 @@ public class BaseTableDdlTest {
     ddlGen.generate(write, alterColumn);
 
     String ddl = write.apply().getBuffer();
-    assertThat(ddl).contains("alter table mytab drop constraint ck_mytab_acol");
+    assertThat(ddl).contains("alter table mytab drop constraint if exists ck_mytab_acol");
     assertThat(ddl).contains("alter table mytab add constraint ck_mytab_acol check (acol in ('A','B'))");
   }
 

src/test/java/misc/migration/v1_0/EEnum.java

@@ -0,0 +1,29 @@
+package misc.migration.v1_0;
+
+
+import javax.persistence.Entity;
+import javax.persistence.Id;
+import javax.persistence.Table;
+
+import io.ebean.annotation.EnumValue;
+
+@Entity
+@Table(name = "migtest_e_enum")
+public class EEnum {
+  
+  public enum Status {
+    @EnumValue("N")
+    NEW,
+
+    @EnumValue("A")
+    ACTIVE,
+
+    @EnumValue("I")
+    INACTIVE,
+  }
+  
+  @Id
+  Integer id;
+  
+  Status testStatus;
+}

src/test/java/misc/migration/v1_1/EEnum.java

@@ -0,0 +1,18 @@
+package misc.migration.v1_1;
+
+
+import javax.persistence.Entity;
+import javax.persistence.Id;
+import javax.persistence.Table;
+import javax.validation.constraints.Size;
+
+@Entity
+@Table(name = "migtest_e_enum")
+public class EEnum {
+  
+  @Id
+  Integer id;
+  
+  @Size (max = 1)
+  String testStatus; // change to String from Enum Status
+}

src/test/java/misc/migration/v1_2/EEnum.java

@@ -0,0 +1,29 @@
+package misc.migration.v1_2;
+
+
+import javax.persistence.Entity;
+import javax.persistence.Id;
+import javax.persistence.Table;
+
+import io.ebean.annotation.EnumValue;
+
+@Entity
+@Table(name = "migtest_e_enum")
+public class EEnum {
+  
+  public enum Status {
+    @EnumValue("N")
+    NEW,
+
+    @EnumValue("A")
+    ACTIVE,
+
+    @EnumValue("I")
+    INACTIVE,
+  }
+  
+  @Id
+  Integer id;
+  
+  Status testStatus;
+}

src/test/resources/dbmigration/migrationtest/db2/1.0__initial.sql

@@ -76,6 +76,13 @@ create table migtest_e_basic (
 -- NOT SUPPORTED alter table migtest_e_basic add constraint uq_mgtst__b_4aybzy unique  (indextest2);
 -- NOT SUPPORTED alter table migtest_e_basic add constraint uq_mgtst__b_4ayc02 unique  (indextest6);
 
+create table migtest_e_enum (
+  id                            integer generated by default as identity not null,
+  test_status                   varchar(1),
+  constraint ck_migtest_e_enum_test_status check ( test_status in ('N','A','I')),
+  constraint pk_migtest_e_enum primary key (id)
+);
+
 create table migtest_e_history (
   id                            integer generated by default as identity not null,
   test_string                   varchar(255),

src/test/resources/dbmigration/migrationtest/db2/1.1.sql

@@ -61,6 +61,7 @@ alter table migtest_e_basic drop constraint uq_mgtst__b_4ayc02;
 -- NOT SUPPORTED alter table migtest_e_basic add constraint uq_mgtst__bsc_nm unique  (name);
 -- NOT SUPPORTED alter table migtest_e_basic add constraint uq_mgtst__b_4ayc00 unique  (indextest4);
 -- NOT SUPPORTED alter table migtest_e_basic add constraint uq_mgtst__b_4ayc01 unique  (indextest5);
+alter table migtest_e_enum drop constraint ck_mgtst__n_773sok;
 comment on column migtest_e_history.test_string is 'Column altered to long now';
 alter table migtest_e_history alter column test_string bigint;
 comment on table migtest_e_history is 'We have history now';

src/test/resources/dbmigration/migrationtest/db2/1.3.sql

@@ -36,6 +36,8 @@ alter table migtest_e_basic drop constraint uq_mgtst__b_4ayc00;
 alter table migtest_e_basic drop constraint uq_mgtst__b_4ayc01;
 -- NOT SUPPORTED alter table migtest_e_basic add constraint uq_mgtst__b_4aybzy unique  (indextest2);
 -- NOT SUPPORTED alter table migtest_e_basic add constraint uq_mgtst__b_4ayc02 unique  (indextest6);
+alter table migtest_e_enum drop constraint ck_mgtst__n_773sok;
+alter table migtest_e_enum add constraint ck_mgtst__n_773sok check ( test_status in ('N','A','I'));
 comment on column migtest_e_history.test_string is '';
 comment on table migtest_e_history is '';
 alter table migtest_e_history2 alter column test_string drop default;

src/test/resources/dbmigration/migrationtest/h2/1.0__initial.sql

@@ -76,6 +76,13 @@ create table migtest_e_basic (
   constraint pk_migtest_e_basic primary key (id)
 );
 
+create table migtest_e_enum (
+  id                            integer auto_increment not null,
+  test_status                   varchar(1),
+  constraint ck_migtest_e_enum_test_status check ( test_status in ('N','A','I')),
+  constraint pk_migtest_e_enum primary key (id)
+);
+
 create table migtest_e_history (
   id                            integer auto_increment not null,
   test_string                   varchar(255),

src/test/resources/dbmigration/migrationtest/h2/1.1.sql

@@ -37,7 +37,7 @@ alter table migtest_fk_set_null drop constraint if exists fk_migtest_fk_set_null
 alter table migtest_fk_set_null add constraint fk_migtest_fk_set_null_one_id foreign key (one_id) references migtest_fk_one (id) on delete restrict on update restrict;
 
 update migtest_e_basic set status = 'A' where status is null;
-alter table migtest_e_basic drop constraint ck_migtest_e_basic_status;
+alter table migtest_e_basic drop constraint if exists ck_migtest_e_basic_status;
 alter table migtest_e_basic alter column status set default 'A';
 alter table migtest_e_basic alter column status set not null;
 alter table migtest_e_basic add constraint ck_migtest_e_basic_status check ( status in ('N','A','I','?'));
@@ -67,6 +67,7 @@ alter table migtest_e_basic add constraint uq_migtest_e_basic_status_indextest1
 alter table migtest_e_basic add constraint uq_migtest_e_basic_name unique  (name);
 alter table migtest_e_basic add constraint uq_migtest_e_basic_indextest4 unique  (indextest4);
 alter table migtest_e_basic add constraint uq_migtest_e_basic_indextest5 unique  (indextest5);
+alter table migtest_e_enum drop constraint if exists ck_migtest_e_enum_test_status;
 comment on column migtest_e_history.test_string is 'Column altered to long now';
 alter table migtest_e_history alter column test_string bigint;
 comment on table migtest_e_history is 'We have history now';

src/test/resources/dbmigration/migrationtest/h2/1.3.sql

@@ -19,7 +19,7 @@ alter table migtest_fk_none drop constraint if exists fk_migtest_fk_none_one_id;
 alter table migtest_fk_none_via_join drop constraint if exists fk_migtest_fk_none_via_join_one_id;
 alter table migtest_fk_set_null drop constraint if exists fk_migtest_fk_set_null_one_id;
 alter table migtest_fk_set_null add constraint fk_migtest_fk_set_null_one_id foreign key (one_id) references migtest_fk_one (id) on delete set null on update set null;
-alter table migtest_e_basic drop constraint ck_migtest_e_basic_status;
+alter table migtest_e_basic drop constraint if exists ck_migtest_e_basic_status;
 alter table migtest_e_basic alter column status drop default;
 alter table migtest_e_basic alter column status set null;
 alter table migtest_e_basic add constraint ck_migtest_e_basic_status check ( status in ('N','A','I'));
@@ -41,6 +41,8 @@ alter table migtest_e_basic drop constraint uq_migtest_e_basic_indextest4;
 alter table migtest_e_basic drop constraint uq_migtest_e_basic_indextest5;
 alter table migtest_e_basic add constraint uq_migtest_e_basic_indextest2 unique  (indextest2);
 alter table migtest_e_basic add constraint uq_migtest_e_basic_indextest6 unique  (indextest6);
+alter table migtest_e_enum drop constraint if exists ck_migtest_e_enum_test_status;
+alter table migtest_e_enum add constraint ck_migtest_e_enum_test_status check ( test_status in ('N','A','I'));
 comment on column migtest_e_history.test_string is '';
 comment on table migtest_e_history is '';
 alter table migtest_e_history2 alter column test_string drop default;

src/test/resources/dbmigration/migrationtest/hsqldb/1.0__initial.sql

@@ -76,6 +76,13 @@ create table migtest_e_basic (
   constraint pk_migtest_e_basic primary key (id)
 );
 
+create table migtest_e_enum (
+  id                            integer generated by default as identity (start with 1)  not null,
+  test_status                   varchar(1),
+  constraint ck_migtest_e_enum_test_status check ( test_status in ('N','A','I')),
+  constraint pk_migtest_e_enum primary key (id)
+);
+
 create table migtest_e_history (
   id                            integer generated by default as identity (start with 1)  not null,
   test_string                   varchar(255),

src/test/resources/dbmigration/migrationtest/hsqldb/1.1.sql

@@ -31,7 +31,7 @@ alter table migtest_fk_set_null drop constraint if exists fk_migtest_fk_set_null
 alter table migtest_fk_set_null add constraint fk_migtest_fk_set_null_one_id foreign key (one_id) references migtest_fk_one (id) on delete restrict on update restrict;
 
 update migtest_e_basic set status = 'A' where status is null;
-alter table migtest_e_basic drop constraint ck_migtest_e_basic_status;
+alter table migtest_e_basic drop constraint if exists ck_migtest_e_basic_status;
 alter table migtest_e_basic alter column status set default 'A';
 alter table migtest_e_basic alter column status set not null;
 alter table migtest_e_basic add constraint ck_migtest_e_basic_status check ( status in ('N','A','I','?'));
@@ -61,6 +61,7 @@ alter table migtest_e_basic add constraint uq_migtest_e_basic_status_indextest1
 alter table migtest_e_basic add constraint uq_migtest_e_basic_name unique  (name);
 alter table migtest_e_basic add constraint uq_migtest_e_basic_indextest4 unique  (indextest4);
 alter table migtest_e_basic add constraint uq_migtest_e_basic_indextest5 unique  (indextest5);
+alter table migtest_e_enum drop constraint if exists ck_migtest_e_enum_test_status;
 comment on column migtest_e_history.test_string is 'Column altered to long now';
 alter table migtest_e_history alter column test_string bigint;
 comment on table migtest_e_history is 'We have history now';

src/test/resources/dbmigration/migrationtest/hsqldb/1.3.sql

@@ -14,7 +14,7 @@ alter table migtest_fk_none drop constraint if exists fk_migtest_fk_none_one_id;
 alter table migtest_fk_none_via_join drop constraint if exists fk_migtest_fk_none_via_join_one_id;
 alter table migtest_fk_set_null drop constraint if exists fk_migtest_fk_set_null_one_id;
 alter table migtest_fk_set_null add constraint fk_migtest_fk_set_null_one_id foreign key (one_id) references migtest_fk_one (id) on delete set null on update set null;
-alter table migtest_e_basic drop constraint ck_migtest_e_basic_status;
+alter table migtest_e_basic drop constraint if exists ck_migtest_e_basic_status;
 alter table migtest_e_basic alter column status drop default;
 alter table migtest_e_basic alter column status set null;
 alter table migtest_e_basic add constraint ck_migtest_e_basic_status check ( status in ('N','A','I'));
@@ -36,6 +36,8 @@ alter table migtest_e_basic drop constraint uq_migtest_e_basic_indextest4;
 alter table migtest_e_basic drop constraint uq_migtest_e_basic_indextest5;
 alter table migtest_e_basic add constraint uq_migtest_e_basic_indextest2 unique  (indextest2);
 alter table migtest_e_basic add constraint uq_migtest_e_basic_indextest6 unique  (indextest6);
+alter table migtest_e_enum drop constraint if exists ck_migtest_e_enum_test_status;
+alter table migtest_e_enum add constraint ck_migtest_e_enum_test_status check ( test_status in ('N','A','I'));
 comment on column migtest_e_history.test_string is '';
 comment on table migtest_e_history is '';
 alter table migtest_e_history2 alter column test_string drop default;

src/test/resources/dbmigration/migrationtest/model/1.0__initial.model.xml

@@ -56,6 +56,10 @@
             <uniqueConstraint name="uq_migtest_e_basic_indextest2" columnNames="indextest2" oneToOne="false" nullableColumns="indextest2"/>
             <uniqueConstraint name="uq_migtest_e_basic_indextest6" columnNames="indextest6" oneToOne="false" nullableColumns="indextest6"/>
         </createTable>
+        <createTable name="migtest_e_enum" pkName="pk_migtest_e_enum">
+            <column name="id" type="integer" primaryKey="true"/>
+            <column name="test_status" type="varchar(1)" checkConstraint="check ( test_status in ('N','A','I'))" checkConstraintName="ck_migtest_e_enum_test_status"/>
+        </createTable>
         <createTable name="migtest_e_history" pkName="pk_migtest_e_history">
             <column name="id" type="integer" primaryKey="true"/>
             <column name="test_string" type="varchar"/>

src/test/resources/dbmigration/migrationtest/model/1.1.model.xml

@@ -36,6 +36,7 @@
         <addUniqueConstraint constraintName="uq_migtest_e_basic_name" tableName="migtest_e_basic" columnNames="name" nullableColumns="name" oneToOne="false"/>
         <addUniqueConstraint constraintName="uq_migtest_e_basic_indextest4" tableName="migtest_e_basic" columnNames="indextest4" nullableColumns="indextest4" oneToOne="false"/>
         <addUniqueConstraint constraintName="uq_migtest_e_basic_indextest5" tableName="migtest_e_basic" columnNames="indextest5" nullableColumns="indextest5" oneToOne="false"/>
+        <alterColumn columnName="test_status" tableName="migtest_e_enum" dropCheckConstraint="ck_migtest_e_enum_test_status"/>
         <addHistoryTable baseTable="migtest_e_history"/>
         <alterColumn columnName="test_string" tableName="migtest_e_history" type="bigint" currentType="varchar" currentNotnull="false" comment="Column altered to long now">
             <before platforms="postgres">alter table ${table} alter column ${column} TYPE bigint USING (${column}::integer)</before>

src/test/resources/dbmigration/migrationtest/model/1.3.model.xml

@@ -21,6 +21,7 @@
         <addUniqueConstraint constraintName="uq_migtest_e_basic_indextest5" tableName="migtest_e_basic" columnNames="DROP CONSTRAINT" nullableColumns="indextest5"/>
         <addUniqueConstraint constraintName="uq_migtest_e_basic_indextest2" tableName="migtest_e_basic" columnNames="indextest2" nullableColumns="indextest2" oneToOne="false"/>
         <addUniqueConstraint constraintName="uq_migtest_e_basic_indextest6" tableName="migtest_e_basic" columnNames="indextest6" nullableColumns="indextest6" oneToOne="false"/>
+        <alterColumn columnName="test_status" tableName="migtest_e_enum" checkConstraint="check ( test_status in ('N','A','I'))" checkConstraintName="ck_migtest_e_enum_test_status"/>
         <alterColumn columnName="test_string" tableName="migtest_e_history" withHistory="true" comment="DROP COMMENT"/>
         <addTableComment name="migtest_e_history" comment="DROP COMMENT"/>
         <alterColumn columnName="test_string" tableName="migtest_e_history2" withHistory="true" currentType="varchar" defaultValue="DROP DEFAULT" notnull="false" currentNotnull="true"/>

src/test/resources/dbmigration/migrationtest/mysql/1.0__initial.sql

@@ -76,6 +76,13 @@ create table migtest_e_basic (
   constraint pk_migtest_e_basic primary key (id)
 );
 
+create table migtest_e_enum (
+  id                            integer auto_increment not null,
+  test_status                   varchar(1),
+  constraint ck_migtest_e_enum_test_status check ( test_status in ('N','A','I')),
+  constraint pk_migtest_e_enum primary key (id)
+);
+
 create table migtest_e_history (
   id                            integer auto_increment not null,
   test_string                   varchar(255),

src/test/resources/dbmigration/migrationtest/mysql/1.3.sql

@@ -38,6 +38,7 @@ alter table migtest_e_basic drop index uq_migtest_e_basic_indextest4;
 alter table migtest_e_basic drop index uq_migtest_e_basic_indextest5;
 alter table migtest_e_basic add constraint uq_migtest_e_basic_indextest2 unique  (indextest2);
 alter table migtest_e_basic add constraint uq_migtest_e_basic_indextest6 unique  (indextest6);
+alter table migtest_e_enum add constraint ck_migtest_e_enum_test_status check ( test_status in ('N','A','I'));
 alter table migtest_e_history comment = '';
 alter table migtest_e_history2 alter test_string drop default;
 alter table migtest_e_history2 add column obsolete_string1 varchar(255);

src/test/resources/dbmigration/migrationtest/oracle/1.0__initial.sql

@@ -85,6 +85,14 @@ create table migtest_e_basic (
 );
 create sequence migtest_e_basic_seq;
 
+create table migtest_e_enum (
+  id                            number(10) not null,
+  test_status                   varchar2(1),
+  constraint ck_migtest_e_enum_test_status check ( test_status in ('N','A','I')),
+  constraint pk_migtest_e_enum primary key (id)
+);
+create sequence migtest_e_enum_seq;
+
 create table migtest_e_history (
   id                            number(10) not null,
   test_string                   varchar2(255),

src/test/resources/dbmigration/migrationtest/oracle/1.1.sql

@@ -62,6 +62,7 @@ alter table migtest_e_basic drop constraint uq_migtest_e_basic_indextest6;
 -- NOT YET IMPLEMENTED: alter table migtest_e_basic add constraint uq_migtest_e_basic_name unique  (name);
 -- NOT YET IMPLEMENTED: alter table migtest_e_basic add constraint uq_migtest_e_basic_indextest4 unique  (indextest4);
 -- NOT YET IMPLEMENTED: alter table migtest_e_basic add constraint uq_migtest_e_basic_indextest5 unique  (indextest5);
+alter table migtest_e_enum drop constraint ck_migtest_e_enum_test_status;
 comment on column migtest_e_history.test_string is 'Column altered to long now';
 alter table migtest_e_history modify test_string number(19);
 comment on table migtest_e_history is 'We have history now';

src/test/resources/dbmigration/migrationtest/oracle/1.3.sql

@@ -37,6 +37,8 @@ alter table migtest_e_basic drop constraint uq_migtest_e_basic_indextest4;
 alter table migtest_e_basic drop constraint uq_migtest_e_basic_indextest5;
 -- NOT YET IMPLEMENTED: alter table migtest_e_basic add constraint uq_migtest_e_basic_indextest2 unique  (indextest2);
 -- NOT YET IMPLEMENTED: alter table migtest_e_basic add constraint uq_migtest_e_basic_indextest6 unique  (indextest6);
+alter table migtest_e_enum drop constraint ck_migtest_e_enum_test_status;
+alter table migtest_e_enum add constraint ck_migtest_e_enum_test_status check ( test_status in ('N','A','I'));
 comment on column migtest_e_history.test_string is '';
 comment on table migtest_e_history is '';
 alter table migtest_e_history2 modify test_string drop default;

src/test/resources/dbmigration/migrationtest/postgres/1.0__initial.sql

@@ -76,6 +76,13 @@ create table migtest_e_basic (
   constraint pk_migtest_e_basic primary key (id)
 );
 
+create table migtest_e_enum (
+  id                            serial not null,
+  test_status                   varchar(1),
+  constraint ck_migtest_e_enum_test_status check ( test_status in ('N','A','I')),
+  constraint pk_migtest_e_enum primary key (id)
+);
+
 create table migtest_e_history (
   id                            serial not null,
   test_string                   varchar(255),

src/test/resources/dbmigration/migrationtest/postgres/1.1.sql

@@ -37,7 +37,7 @@ alter table if exists migtest_fk_set_null drop constraint if exists fk_migtest_f
 alter table migtest_fk_set_null add constraint fk_migtest_fk_set_null_one_id foreign key (one_id) references migtest_fk_one (id) on delete restrict on update restrict;
 
 update migtest_e_basic set status = 'A' where status is null;
-alter table migtest_e_basic drop constraint ck_migtest_e_basic_status;
+alter table migtest_e_basic drop constraint if exists ck_migtest_e_basic_status;
 alter table migtest_e_basic alter column status set default 'A';
 alter table migtest_e_basic alter column status set not null;
 alter table migtest_e_basic add constraint ck_migtest_e_basic_status check ( status in ('N','A','I','?'));
@@ -67,6 +67,7 @@ alter table migtest_e_basic add constraint uq_migtest_e_basic_status_indextest1
 alter table migtest_e_basic add constraint uq_migtest_e_basic_name unique  (name);
 alter table migtest_e_basic add constraint uq_migtest_e_basic_indextest4 unique  (indextest4);
 alter table migtest_e_basic add constraint uq_migtest_e_basic_indextest5 unique  (indextest5);
+alter table migtest_e_enum drop constraint if exists ck_migtest_e_enum_test_status;
 
 alter table migtest_e_history alter column test_string TYPE bigint USING (test_string::integer);
 comment on column migtest_e_history.test_string is 'Column altered to long now';

src/test/resources/dbmigration/migrationtest/postgres/1.3.sql

@@ -19,7 +19,7 @@ alter table if exists migtest_fk_none drop constraint if exists fk_migtest_fk_no
 alter table if exists migtest_fk_none_via_join drop constraint if exists fk_migtest_fk_none_via_join_one_id;
 alter table if exists migtest_fk_set_null drop constraint if exists fk_migtest_fk_set_null_one_id;
 alter table migtest_fk_set_null add constraint fk_migtest_fk_set_null_one_id foreign key (one_id) references migtest_fk_one (id) on delete set null on update set null;
-alter table migtest_e_basic drop constraint ck_migtest_e_basic_status;
+alter table migtest_e_basic drop constraint if exists ck_migtest_e_basic_status;
 alter table migtest_e_basic alter column status drop default;
 alter table migtest_e_basic alter column status drop not null;
 alter table migtest_e_basic add constraint ck_migtest_e_basic_status check ( status in ('N','A','I'));
@@ -41,6 +41,8 @@ alter table migtest_e_basic drop constraint uq_migtest_e_basic_indextest4;
 alter table migtest_e_basic drop constraint uq_migtest_e_basic_indextest5;
 alter table migtest_e_basic add constraint uq_migtest_e_basic_indextest2 unique  (indextest2);
 alter table migtest_e_basic add constraint uq_migtest_e_basic_indextest6 unique  (indextest6);
+alter table migtest_e_enum drop constraint if exists ck_migtest_e_enum_test_status;
+alter table migtest_e_enum add constraint ck_migtest_e_enum_test_status check ( test_status in ('N','A','I'));
 comment on column migtest_e_history.test_string is '';
 comment on table migtest_e_history is '';
 alter table migtest_e_history2 alter column test_string drop default;

src/test/resources/dbmigration/migrationtest/sqlite/1.0__initial.sql

@@ -79,6 +79,13 @@ create table migtest_e_basic (
   foreign key (eref_id) references migtest_e_ref (id) on delete restrict on update restrict
 );
 
+create table migtest_e_enum (
+  id                            integer not null,
+  test_status                   varchar(1),
+  constraint ck_migtest_e_enum_test_status check ( test_status in ('N','A','I')),
+  constraint pk_migtest_e_enum primary key (id)
+);
+
 create table migtest_e_history (
   id                            integer not null,
   test_string                   varchar(255),

src/test/resources/dbmigration/migrationtest/sqlite/1.1.sql

@@ -30,7 +30,7 @@ alter table migtest_fk_cascade drop constraint if exists fk_migtest_fk_cascade_o
 alter table migtest_fk_set_null drop constraint if exists fk_migtest_fk_set_null_one_id;
 
 update migtest_e_basic set status = 'A' where status is null;
-alter table migtest_e_basic drop constraint ck_migtest_e_basic_status;
+alter table migtest_e_basic drop constraint if exists ck_migtest_e_basic_status;
 alter table migtest_e_basic alter column status set default 'A';
 alter table migtest_e_basic alter column status set not null;
 alter table migtest_e_basic add constraint ck_migtest_e_basic_status check ( status in ('N','A','I','?'));
@@ -59,6 +59,7 @@ alter table migtest_e_basic add constraint uq_migtest_e_basic_status_indextest1
 alter table migtest_e_basic add constraint uq_migtest_e_basic_name unique  (name);
 alter table migtest_e_basic add constraint uq_migtest_e_basic_indextest4 unique  (indextest4);
 alter table migtest_e_basic add constraint uq_migtest_e_basic_indextest5 unique  (indextest5);
+alter table migtest_e_enum drop constraint if exists ck_migtest_e_enum_test_status;
 alter table migtest_e_history alter column test_string integer;
 
 -- NOTE: table has @History - special migration may be necessary

src/test/resources/dbmigration/migrationtest/sqlite/1.3.sql

@@ -12,7 +12,7 @@ alter table migtest_fk_cascade drop constraint if exists fk_migtest_fk_cascade_o
 alter table migtest_fk_none drop constraint if exists fk_migtest_fk_none_one_id;
 alter table migtest_fk_none_via_join drop constraint if exists fk_migtest_fk_none_via_join_one_id;
 alter table migtest_fk_set_null drop constraint if exists fk_migtest_fk_set_null_one_id;
-alter table migtest_e_basic drop constraint ck_migtest_e_basic_status;
+alter table migtest_e_basic drop constraint if exists ck_migtest_e_basic_status;
 alter table migtest_e_basic alter column status drop default;
 alter table migtest_e_basic alter column status set null;
 alter table migtest_e_basic add constraint ck_migtest_e_basic_status check ( status in ('N','A','I'));
@@ -34,6 +34,8 @@ alter table migtest_e_basic drop constraint uq_migtest_e_basic_indextest4;
 alter table migtest_e_basic drop constraint uq_migtest_e_basic_indextest5;
 alter table migtest_e_basic add constraint uq_migtest_e_basic_indextest2 unique  (indextest2);
 alter table migtest_e_basic add constraint uq_migtest_e_basic_indextest6 unique  (indextest6);
+alter table migtest_e_enum drop constraint if exists ck_migtest_e_enum_test_status;
+alter table migtest_e_enum add constraint ck_migtest_e_enum_test_status check ( test_status in ('N','A','I'));
 alter table migtest_e_history2 alter column test_string drop default;
 alter table migtest_e_history2 alter column test_string set null;
 alter table migtest_e_history2 add column obsolete_string1 varchar(255);

src/test/resources/dbmigration/migrationtest/sqlserver17/1.0__initial.sql

@@ -85,6 +85,14 @@ create unique nonclustered index uq_migtest_e_basic_indextest2 on migtest_e_basi
 create unique nonclustered index uq_migtest_e_basic_indextest6 on migtest_e_basic(indextest6) where indextest6 is not null;
 create sequence migtest_e_basic_seq as bigint  start with 1 ;
 
+create table migtest_e_enum (
+  id                            integer not null,
+  test_status                   nvarchar(1),
+  constraint ck_migtest_e_enum_test_status check ( test_status in ('N','A','I')),
+  constraint pk_migtest_e_enum primary key (id)
+);
+create sequence migtest_e_enum_seq as bigint  start with 1 ;
+
 create table migtest_e_history (
   id                            integer not null,
   test_string                   nvarchar(255),

src/test/resources/dbmigration/migrationtest/sqlserver17/1.1.sql

@@ -64,6 +64,7 @@ create unique nonclustered index uq_migtest_e_basic_status_indextest1 on migtest
 create unique nonclustered index uq_migtest_e_basic_name on migtest_e_basic(name) where name is not null;
 create unique nonclustered index uq_migtest_e_basic_indextest4 on migtest_e_basic(indextest4) where indextest4 is not null;
 create unique nonclustered index uq_migtest_e_basic_indextest5 on migtest_e_basic(indextest5) where indextest5 is not null;
+IF (OBJECT_ID('ck_migtest_e_enum_test_status', 'C') IS NOT NULL) alter table migtest_e_enum drop constraint ck_migtest_e_enum_test_status;
 alter table migtest_e_history alter column test_string numeric(19);
 
 -- NOTE: table has @History - special migration may be necessary

src/test/resources/dbmigration/migrationtest/sqlserver17/1.3.sql

@@ -48,6 +48,8 @@ IF (OBJECT_ID('uq_migtest_e_basic_indextest5', 'UQ') IS NOT NULL) alter table mi
 IF EXISTS (SELECT name FROM sys.indexes WHERE object_id = OBJECT_ID('migtest_e_basic','U') AND name = 'uq_migtest_e_basic_indextest5') drop index uq_migtest_e_basic_indextest5 ON migtest_e_basic;
 create unique nonclustered index uq_migtest_e_basic_indextest2 on migtest_e_basic(indextest2) where indextest2 is not null;
 create unique nonclustered index uq_migtest_e_basic_indextest6 on migtest_e_basic(indextest6) where indextest6 is not null;
+IF (OBJECT_ID('ck_migtest_e_enum_test_status', 'C') IS NOT NULL) alter table migtest_e_enum drop constraint ck_migtest_e_enum_test_status;
+alter table migtest_e_enum add constraint ck_migtest_e_enum_test_status check ( test_status in ('N','A','I'));
 delimiter $$
 DECLARE @Tmp nvarchar(200);select @Tmp = t1.name  from sys.default_constraints t1
   join sys.columns t2 on t1.object_id = t2.default_object_id