Fixed issue #762

src/Schema/AbstractSchema.php

@@ -574,4 +574,34 @@
 
         return (array) $this->viewNames[$schema];
     }
+
+    /**
+     * @throws Throwable
+     */
+    public function hasTable(string $tableName, string $schema = ''): bool
+    {
+        $tables = $this->getTableNames($schema);
+
+        return in_array($tableName, $tables);
+    }
+
+    /**
+     * @throws Throwable
+     */
+    public function hasSchema(string $schema): bool
+    {
+        $schemas = $this->getSchemaNames();
+
+        return in_array($schema, $schemas);
+    }
+
+    /**
+     * @throws Throwable
+     */
+    public function hasView(string $viewName, string $schema = ''): bool
+    {
+        $views = $this->getViewNames($schema);
+
+        return in_array($viewName, $views);
+    }
 }

src/Schema/SchemaInterface.php

@@ -416,4 +416,32 @@ public function enableCache(bool $value): void;
      * @return array All view names in the database.
      */
     public function getViewNames(string $schema = '', bool $refresh = false): array;
+
+    /**
+     * Determines if a specified table exists in the database.
+     *
+     * @param string $tableName The table name to search for
+     * @param string $schema The schema of the tables. Defaults to empty string, meaning the current or default schema
+     *  name. If not empty, the table will be searched in the specified schema.
+     * @return bool Whether table exists or not
+     */
+    public function hasTable(string $tableName, string $schema = ''): bool;
+
+    /**
+     * Determines if a specified schema exists in the database.
+     *
+     * @param string $schema The table name to search for
+     * @return bool Whether schema exists or not
+     */
+    public function hasSchema(string $schema): bool;
+
+    /**
+     * Determines if a specified view exists in the database.
+     *
+     * @param string $viewName The table name to search for
+     * @param string $schema The schema of the tables. Defaults to empty string, meaning the current or default schema
+     *   name. If not empty, the table will be searched in the specified schema.
+     * @return bool Whether view exists or not
+     */
+    public function hasView(string $viewName, string $schema = ''): bool;
 }

tests/Common/CommonSchemaTest.php

@@ -405,6 +405,27 @@ public function testGetTableNames(array $pdoAttributes): void
         $db->close();
     }
 
+    public function testHasTable(array $pdoAttributes): void
+    {
+        $db = $this->getConnection(true);
+
+        foreach ($pdoAttributes as $name => $value) {
+            if ($name === PDO::ATTR_EMULATE_PREPARES) {
+                continue;
+            }
+
+            $db->getPDO()?->setAttribute($name, $value);
+        }
+
+        $schema = $db->getSchema();
+
+        $this->assertTrue($schema->hasTable('customer'));
+        $this->assertTrue($schema->hasTable('category'));
+        $this->assertFalse($schema->hasTable('no_such_table'));
+
+        $db->close();
+    }
+
     /**
      * @dataProvider \Yiisoft\Db\Tests\Provider\SchemaProvider::tableSchema
      */
@@ -482,6 +503,18 @@ public function testGetViewNames(): void
         $db->close();
     }
 
+    public function testHasView(): void
+    {
+        $db = $this->getConnection(true);
+
+        $schema = $db->getSchema();
+
+        $this->assertTrue($schema->hasView('animal_view'));
+        $this->assertFalse($schema->hasView('no_such_view'));
+
+        $db->close();
+    }
+
     public function testNegativeDefaultValues(): void
     {
         $db = $this->getConnection(true);

tests/Db/Schema/SchemaTest.php

@@ -202,6 +202,20 @@ public function testGetSchemaNamesWithSchema(): void
         $this->assertSame(['dbo', 'public'], $schema->getSchemaNames());
     }
 
+    public function testHasSchema(): void
+    {
+        $db = $this->getConnection();
+
+        $schema = $db->getSchema();
+        Assert::setInaccessibleProperty($schema, 'schemaNames', ['dbo', 'public']);
+
+        $this->assertTrue($schema->hasSchema('dbo'));
+        $this->assertTrue($schema->hasSchema('public'));
+        $this->assertFalse($schema->hasSchema('no_such_schema'));
+
+        $db->close();
+    }
+
     /**
      * @throws NotSupportedException
      */