Merge pull request #454 from akshatdubeysf/GH-451

adds full text search using match and its supported search modifiers

README.md

@@ -150,6 +150,14 @@ that you require.
       <td>String</td>
       <td>Username to connect to database</td>
     </tr>
+    <tr>
+      <td>allowExtendedOperators</td>
+      <td>Boolean</td>
+      <td>Set to <code>true</code> to enable MySQL-specific operators
+          such as <code>match</code>. Learn more in
+          <a href="#extended-operators">Extended operators</a> below.
+      </td>
+    </tr>
   </tbody>
 </table>
 
@@ -498,6 +506,55 @@ last_modified: Date;
 - GEOMETRY
 - JSON
 
+## Extended operators
+MySQL connector supports the following MySQL-specific operators:
+- [`match`](#operator-match)
+Please note extended operators are disabled by default, you must enable
+them at datasource level or model level by setting `allowExtendedOperators` to
+`true`.
+### Operator `match`
+The `match` operator allows you to perform a full text search using the [MATCH() .. AGAINST()](https://dev.mysql.com/doc/refman/8.0/en/fulltext-search.html) operator in MySQL.
+
+Three different modes of the `MATCH` clause are also available in the form of operators - 
+
+- `matchbool` for [Boolean Full Text Search](https://dev.mysql.com/doc/refman/8.0/en/fulltext-boolean.html)
+- `matchnl` for [Natural Language Full Text Search](https://dev.mysql.com/doc/refman/8.0/en/fulltext-natural-language.html)
+- `matchqe` for [Full-Text Searches with Query Expansion](https://dev.mysql.com/doc/refman/8.0/en/fulltext-query-expansion.html)
+- `matchnlqe` for [Full-Text Searches with Query Expansion](https://dev.mysql.com/doc/refman/8.0/en/fulltext-query-expansion.html) with the `IN NATURAL LANGUAGE MODE WITH QUERY EXPANSION` modifier.
+
+By default, the `match` operator works in Natural Language mode.
+
+**Note** The fields you are querying must be setup with a `FULLTEXT` index to perform full text search on them.
+Assuming a model such as this:
+```ts
+@model({
+  settings: {
+    allowExtendedOperators: true,
+  }
+})
+class Post {
+  @property({
+    type: 'string',
+    mysql: {
+      index: {
+        kind: 'FULLTEXT'
+      }
+    },
+  })
+  content: string;
+}
+```
+You can query the content field as follows:
+```ts
+const posts = await postRepository.find({
+  where: {
+    {
+      content: {match: 'someString'},
+    }
+  }
+});
+```
+
 ## Discovery and auto-migration
 
 ### Model discovery

lib/mysql.js

@@ -550,8 +550,10 @@ MySQL.prototype.ping = function(cb) {
 
 MySQL.prototype.buildExpression = function(columnName, operator, operatorValue,
   propertyDefinition) {
-  if (operator === 'regexp') {
+  let clause;
-    let clause = columnName + ' REGEXP ?';
+  switch (operator) {
+    case 'regexp':
+      clause = columnName + ' REGEXP ?';
       // By default, MySQL regexp is not case sensitive. (https://dev.mysql.com/doc/refman/5.7/en/regexp.html)
       // To allow case sensitive regexp query, it has to be binded to a `BINARY` type.
       // If ignore case is not specified, search it as case sensitive.
@@ -569,6 +571,31 @@ MySQL.prototype.buildExpression = function(columnName, operator, operatorValue,
 
       return new ParameterizedSQL(clause,
         [operatorValue.source]);
+    case 'matchnl':
+    case 'matchqe':
+    case 'matchnlqe':
+    case 'matchbool':
+    case 'match':
+      let mode;
+      switch (operator) {
+        case 'matchbool':
+          mode = ' IN BOOLEAN MODE';
+          break;
+        case 'matchnl':
+          mode = ' IN NATURAL LANGUAGE MODE';
+          break;
+        case 'matchqe':
+          mode = ' WITH QUERY EXPANSION';
+          break;
+        case 'matchnlqe':
+          mode = ' IN NATURAL LANGUAGE MODE WITH QUERY EXPANSION';
+          break;
+        default:
+          mode = '';
+      }
+      clause = ` MATCH (${columnName}) AGAINST (?${mode})`;
+
+      return new ParameterizedSQL(clause, [operatorValue]);
   }
 
   // invoke the base implementation of `buildExpression`

test/mysql.test.js

@@ -37,6 +37,17 @@ describe('mysql', function() {
       userId: ObjectID,
     }, {
       forceId: false,
+      indexes: {
+        content_fts_index: {
+          kind: 'FULLTEXT',
+          columns: 'content',
+        },
+        title_fts_index: {
+          kind: 'FULLTEXT',
+          columns: 'title',
+        },
+      },
+      allowExtendedOperators: true,
     });
 
     PostWithStringId = db.define('PostWithStringId', {
@@ -912,6 +923,105 @@ describe('mysql', function() {
     });
   });
 
+  context('match operator', function() {
+    beforeEach(function deleteExistingTestFixtures(done) {
+      Post.destroyAll(done);
+    });
+    beforeEach(function createTestFixtures(done) {
+      Post.create([
+        {title: 'About Redis', content: 'Redis is a Database'},
+        {title: 'Usage', content: 'How To Use MySQL database Well'},
+        {title: 'About Mysql', content: 'Mysql is a database'},
+      ], done);
+    });
+    after(function deleteTestFixtures(done) {
+      Post.destroyAll(done);
+    });
+
+    context('with one column and string', () => {
+      it('should work', function(done) {
+        Post.find({where: {content: {match: '+using MYSQL'}}}, (err, posts) => {
+          should.not.exist(err);
+          should.exist(posts);
+          posts.length.should.equal(2);
+          done();
+        });
+      });
+      it('should work in boolean mode with empty result expected', function(done) {
+        Post.find({where: {content: {matchbool: '+using MYSQL'}}}, (err, posts) => {
+          should.not.exist(err);
+          should.exist(posts);
+          posts.length.should.equal(0);
+          done();
+        });
+      });
+      it('should work in boolean mode with one result expected', function(done) {
+        Post.find({where: {content: {matchbool: '+use MYSQL'}}}, (err, posts) => {
+          should.not.exist(err);
+          should.exist(posts);
+          posts.length.should.equal(1);
+          done();
+        });
+      });
+      it('should work with matchqe operator with expected result in first and second pass', function(done) {
+        Post.find({where: {content: {match: 'redis'}}}, (err, posts) => {
+          should.not.exist(err);
+          should.exist(posts);
+          posts.length.should.equal(1);
+          Post.find({where: {content: {matchqe: 'redis'}}}, (err, expandedPosts) => {
+            should.not.exist(err);
+            should.exist(expandedPosts);
+            expandedPosts.length.should.equal(3);
+            done();
+          });
+        });
+      });
+      it('should work with matchnlqe operator with expected result in first and second pass', function(done) {
+        Post.find({where: {content: {match: 'redis'}}}, (err, posts) => {
+          should.not.exist(err);
+          should.exist(posts);
+          posts.length.should.equal(1);
+          Post.find({where: {content: {matchnlqe: 'redis'}}}, (err, expandedPosts) => {
+            should.not.exist(err);
+            should.exist(expandedPosts);
+            expandedPosts.length.should.equal(3);
+            done();
+          });
+        });
+      });
+    });
+
+    context('with multiple column and one string', () => {
+      it('should work', function(done) {
+        const against = 'using MYSQL';
+        Post.find(
+          {
+            where: {
+              or: [
+                {
+                  content: {
+                    match: against,
+                  },
+                },
+                {
+                  title: {
+                    match: against,
+                  },
+                },
+              ],
+            },
+          },
+          (err, posts) => {
+            should.not.exist(err);
+            should.exist(posts);
+            posts.length.should.equal(2);
+            done();
+          },
+        );
+      });
+    });
+  });
+
   function deleteAllModelInstances() {
     const models = [
       Post, PostWithStringId, PostWithUniqueTitle, PostWithNumId, Student,