From 86e7fa40b45afd491cbe0555c6c05a2e1994b8e4 Mon Sep 17 00:00:00 2001
From: Lukas Eder <lukas.eder@gmail.com>
Date: Tue, 12 Nov 2019 17:04:31 +0100
Subject: [PATCH] [jOOQ/jOOQ#9534] Add support ALTER TABLE .. DROP UNIQUE
 <name>

---
 .../main/java/org/jooq/AlterTableStep.java    | 40 +++++++++++++++++++
 .../java/org/jooq/impl/AlterTableImpl.java    | 25 ++++++++++++
 2 files changed, 65 insertions(+)

diff --git a/jOOQ/src/main/java/org/jooq/AlterTableStep.java b/jOOQ/src/main/java/org/jooq/AlterTableStep.java
index 554154ad8c..433edb21ee 100644
--- a/jOOQ/src/main/java/org/jooq/AlterTableStep.java
+++ b/jOOQ/src/main/java/org/jooq/AlterTableStep.java
@@ -638,6 +638,46 @@ public interface AlterTableStep {
     @Support({ CUBRID, DERBY, FIREBIRD, H2, HSQLDB, MARIADB, MYSQL, POSTGRES })
     AlterTableDropStep dropPrimaryKey(String constraint);
 
+    /**
+     * Add a <code>DROP UNIQUE</code> clause to the <code>ALTER TABLE</code>
+     * statement.
+     * <p>
+     * Some dialects (e.g. {@link SQLDialect#COCKROACHDB}) may not be able to
+     * drop constraints by name. If users specify the constraint type
+     * <em>and</em> the name, however, then the syntax can be emulated, e.g.
+     * using <code>DROP INDEX .. CASCADE</code>.
+     */
+    @Support({ CUBRID, DERBY, FIREBIRD, H2, HSQLDB, MARIADB, MYSQL, POSTGRES })
+    AlterTableDropStep dropUnique(Constraint constraint);
+
+    /**
+     * Add a <code>DROP UNIQUE</code> clause to the <code>ALTER TABLE</code>
+     * statement.
+     * <p>
+     * Some dialects (e.g. {@link SQLDialect#COCKROACHDB}) may not be able to
+     * drop constraints by name. If users specify the constraint type
+     * <em>and</em> the name, however, then the syntax can be emulated, e.g.
+     * using <code>DROP INDEX .. CASCADE</code>.
+     *
+     * @see DSL#constraint(Name)
+     */
+    @Support({ CUBRID, DERBY, FIREBIRD, H2, HSQLDB, MARIADB, MYSQL, POSTGRES })
+    AlterTableDropStep dropUnique(Name constraint);
+
+    /**
+     * Add a <code>DROP UNIQUE</code> clause to the <code>ALTER TABLE</code>
+     * statement.
+     * <p>
+     * Some dialects (e.g. {@link SQLDialect#COCKROACHDB}) may not be able to
+     * drop constraints by name. If users specify the constraint type
+     * <em>and</em> the name, however, then the syntax can be emulated, e.g.
+     * using <code>DROP INDEX .. CASCADE</code>.
+     *
+     * @see DSL#constraint(String)
+     */
+    @Support({ CUBRID, DERBY, FIREBIRD, H2, HSQLDB, MARIADB, MYSQL, POSTGRES })
+    AlterTableDropStep dropUnique(String constraint);
+
     /**
      * Add a <code>DROP FOREIGN KEY</code> clause to the <code>ALTER TABLE</code>
      * statement.
diff --git a/jOOQ/src/main/java/org/jooq/impl/AlterTableImpl.java b/jOOQ/src/main/java/org/jooq/impl/AlterTableImpl.java
index e186266337..21487bb1f9 100644
--- a/jOOQ/src/main/java/org/jooq/impl/AlterTableImpl.java
+++ b/jOOQ/src/main/java/org/jooq/impl/AlterTableImpl.java
@@ -76,6 +76,7 @@ import static org.jooq.impl.Cascade.CASCADE;
 import static org.jooq.impl.Cascade.RESTRICT;
 import static org.jooq.impl.ConstraintType.FOREIGN_KEY;
 import static org.jooq.impl.ConstraintType.PRIMARY_KEY;
+import static org.jooq.impl.ConstraintType.UNIQUE;
 import static org.jooq.impl.DSL.begin;
 import static org.jooq.impl.DSL.commentOnTable;
 import static org.jooq.impl.DSL.condition;
@@ -826,6 +827,23 @@ final class AlterTableImpl extends AbstractRowCountQuery implements
         return dropPrimaryKey(constraint(constraint));
     }
 
+    @Override
+    public final AlterTableImpl dropUnique(Constraint constraint) {
+        dropConstraint = constraint;
+        dropConstraintType = UNIQUE;
+        return this;
+    }
+
+    @Override
+    public final AlterTableImpl dropUnique(Name constraint) {
+        return dropUnique(constraint(constraint));
+    }
+
+    @Override
+    public final AlterTableImpl dropUnique(String constraint) {
+        return dropUnique(constraint(constraint));
+    }
+
     @Override
     public final AlterTableImpl dropForeignKey(Constraint constraint) {
         dropConstraint = constraint;
@@ -1009,6 +1027,13 @@ final class AlterTableImpl extends AbstractRowCountQuery implements
 
 
 
+
+
+
+
+
+
+