assets/myt.default.yml

@@ -6,6 +6,11 @@ mockFunctions:
   - mockTime
   - mockUtcTime
 sumViews: true
+defaultDefiner: root@localhost
+deprecMarkRegex: __$
+deprecCommentRegex: ^@deprecated [0-9]{4}-[0-9]{2}-[0-9]{2}
+deprecDateRegex: '[0-9]{4}-[0-9]{2}-[0-9]{2}'
+deprecRetentionPeriod: 60 # Days
 privileges:
   userTable: global_priv
   userWhere: >-

myt-clean.js

@@ -10,7 +10,7 @@ class Clean extends Command {
     static usage = {
         description: 'Cleans old applied versions',
         params: {
-            purge: 'Wether to remove non-existent scripts from DB log'
+            purge: 'Whether to remove non-existent scripts from DB log'
         }
     };
 

myt-create.js

@@ -43,7 +43,7 @@ class Create extends Command {
         const params = {
             schema,
             name,
-            definer: 'root@localhost'
+            definer: opts.defaultDefiner
         };
 
         switch (opts.type) {

myt-dump.js

@@ -9,7 +9,7 @@ class Dump extends Command {
         description: 'Dumps structure and fixtures from remote',
         params: {
             lock: 'Whether to lock tables on dump',
-            triggers: 'Wether to include triggers into dump'
+            triggers: 'Whether to include triggers into dump'
         },
         operand: 'remote'
     };

myt-push.js

@@ -15,9 +15,9 @@ class Push extends Command {
         description: 'Apply changes into database',
         params: {
             force: 'Answer yes to all questions',
-            commit: 'Wether to save the commit SHA into database',
+            commit: 'Whether to save the commit SHA into database',
             sums: 'Save SHA sums of pushed objects',
-            triggers: 'Wether to exclude triggers, used to generate local DB'
+            triggers: 'Whether to exclude triggers, used to generate local DB'
         },
         operand: 'remote'
     };

myt-version.js

@@ -1,6 +1,7 @@
 const Myt = require('./myt');
 const Command = require('./lib/command');
 const fs = require('fs-extra');
+const SqlString = require('sqlstring');
 
 /**
  * Creates a new version.
@@ -9,18 +10,23 @@ class Version extends Command {
     static usage = {
         description: 'Creates a new version',
         params: {
-            name: 'Name for the new version'
+            name: 'Name for the new version',
+            deprecate: 'Whether to generate sql to delete deprecated objects'
         },
         operand: 'name'
     };
 
     static opts = {
         alias: {
-            name: 'n'
+            name: 'n',
+            deprecate: 'p'
         },
         string: [
             'name'
         ],
+        boolean: [
+            'deprecate'
+        ],
         default: {
             remote: 'production'
         }
@@ -36,7 +42,8 @@ class Version extends Command {
         },
         versionCreated: function(versionName) {
             console.log(`New version created: ${versionName}`);
-        }
+        },
+        deprecate: 'Generating SQL for deprecated objects deletion.'
     };
 
     async run(myt, opts) {
@@ -121,10 +128,16 @@ class Version extends Command {
                 [opts.code, newVersion]
             );
             await fs.mkdir(newVersionDir);
+
+            if (opts.deprecate) {
+                this.emit('deprecate');
+                await deprecate(conn, opts, newVersionDir);
+            } else
                 await fs.writeFile(
                     `${newVersionDir}/00-firstScript.sql`,
                     '-- Place your SQL code here\n'
                 );
+
             this.emit('versionCreated', versionFolder);
 
             await conn.query('COMMIT');
@@ -137,6 +150,105 @@ class Version extends Command {
     }
 }
 
+async function deprecate(conn, opts, newVersionDir) {
+    const now = new Date();
+    const minDeprecDate = new Date(now.getTime() - opts.deprecRetentionPeriod * 24 * 60 * 60 * 1000);    
+    const deprecMarkRegex = opts.deprecMarkRegex;
+    const deprecCommentRegex = opts.deprecCommentRegex;
+    const deprecDateRegex = opts.deprecDateRegex;
+    const filePath = `${newVersionDir}/00-deprecate.sql`;
+
+    // Generate the drops of the primary keys
+    const [primaryKeys] = await conn.query(`
+        SELECT c.TABLE_SCHEMA 'schema', c.TABLE_NAME 'table'
+            FROM information_schema.COLUMNS c
+                LEFT JOIN information_schema.VIEWS v ON v.TABLE_SCHEMA = c.TABLE_SCHEMA
+                    AND v.TABLE_NAME = c.TABLE_NAME
+                JOIN information_schema.STATISTICS s ON s.TABLE_SCHEMA = c.TABLE_SCHEMA
+                    AND s.TABLE_NAME = c.TABLE_NAME
+                    AND s.COLUMN_NAME = c.COLUMN_NAME
+            WHERE c.COLUMN_NAME REGEXP ? COLLATE utf8mb4_unicode_ci
+                AND c.COLUMN_COMMENT REGEXP ? COLLATE utf8mb4_unicode_ci
+                AND REGEXP_SUBSTR(c.COLUMN_COMMENT, ? COLLATE utf8mb4_unicode_ci) < ?
+                AND v.TABLE_NAME IS NULL
+                AND s.INDEX_NAME = 'PRIMARY'
+    `, [deprecMarkRegex, deprecCommentRegex, deprecDateRegex, minDeprecDate]);
+
+    primaryKeys.map(async row => {
+        await fs.appendFile(
+            filePath,
+            'ALTER TABLE ' + SqlString.escapeId(row.schema, true) + '.' +
+                SqlString.escapeId(row.table, true) + ' DROP PRIMARY KEY;\n'
+        );
+    });
+
+    // Generate the drops of the foreign keys
+    const [foreignKeys] = await conn.query(`
+        SELECT c.TABLE_SCHEMA 'schema', c.TABLE_NAME 'table', kcu.CONSTRAINT_NAME 'constraint'
+            FROM information_schema.COLUMNS c
+                LEFT JOIN information_schema.VIEWS v ON v.TABLE_SCHEMA = c.TABLE_SCHEMA
+                    AND v.TABLE_NAME = c.TABLE_NAME
+                JOIN information_schema.KEY_COLUMN_USAGE kcu ON kcu.TABLE_SCHEMA = c.TABLE_SCHEMA
+                    AND kcu.TABLE_NAME = c.TABLE_NAME
+                    AND kcu.COLUMN_NAME = c.COLUMN_NAME
+            WHERE c.COLUMN_NAME REGEXP ? COLLATE utf8mb4_unicode_ci
+                AND c.COLUMN_COMMENT REGEXP ? COLLATE utf8mb4_unicode_ci
+                AND REGEXP_SUBSTR(c.COLUMN_COMMENT, ? COLLATE utf8mb4_unicode_ci) < ?
+                AND v.TABLE_NAME IS NULL
+                AND kcu.REFERENCED_COLUMN_NAME IS NOT NULL
+    `, [deprecMarkRegex, deprecCommentRegex, deprecDateRegex, minDeprecDate]);
+
+    foreignKeys.map(async row => {
+        await fs.appendFile(
+            filePath,
+            'ALTER TABLE ' + SqlString.escapeId(row.schema, true) + '.' + 
+                SqlString.escapeId(row.table, true) + ' DROP FOREIGN KEY ' + 
+                SqlString.escapeId(row.constraint, true) + ';\n'
+        );
+    });
+
+    // Generate the drops of the columns
+    const [columns] = await conn.query(`
+        SELECT c.TABLE_SCHEMA 'schema', c.TABLE_NAME 'table', c.COLUMN_NAME 'column'
+            FROM information_schema.COLUMNS c
+                LEFT JOIN information_schema.VIEWS v ON v.TABLE_SCHEMA = c.TABLE_SCHEMA
+                    AND v.TABLE_NAME = c.TABLE_NAME
+                LEFT JOIN information_schema.KEY_COLUMN_USAGE kcu ON kcu.TABLE_SCHEMA = c.TABLE_SCHEMA
+                    AND kcu.TABLE_NAME = c.TABLE_NAME
+                    AND kcu.COLUMN_NAME = c.COLUMN_NAME
+            WHERE c.COLUMN_NAME REGEXP ? COLLATE utf8mb4_unicode_ci
+                AND c.COLUMN_COMMENT REGEXP ? COLLATE utf8mb4_unicode_ci
+                AND REGEXP_SUBSTR(c.COLUMN_COMMENT, ? COLLATE utf8mb4_unicode_ci) <?
+                AND v.TABLE_NAME IS NULL
+    `, [deprecMarkRegex, deprecCommentRegex, deprecDateRegex, minDeprecDate]);
+
+    columns.map(async row => {
+        await fs.appendFile(
+            filePath,
+            'ALTER TABLE ' + SqlString.escapeId(row.schema, true) + '.' + 
+                SqlString.escapeId(row.table, true) + ' DROP COLUMN ' + 
+                SqlString.escapeId(row.column, true) + ';\n'
+        );
+    });
+
+    // Generate the drops of the tables
+    const [tables] = await conn.query(`
+        SELECT TABLE_SCHEMA 'schema', TABLE_NAME 'table'
+            FROM information_schema.TABLES
+            WHERE TABLE_NAME REGEXP ? COLLATE utf8mb4_unicode_ci
+                AND TABLE_COMMENT REGEXP ? COLLATE utf8mb4_unicode_ci
+                AND REGEXP_SUBSTR(TABLE_COMMENT, ? COLLATE utf8mb4_unicode_ci) < ?
+    `, [deprecMarkRegex, deprecCommentRegex, deprecDateRegex, minDeprecDate]);
+
+    tables.map(async row => {
+        await fs.appendFile(
+            filePath,
+            'DROP TABLE ' + SqlString.escapeId(row.schema, true) + '.' + 
+                SqlString.escapeId(row.table, true) + ';\n'
+        );
+    });
+}
+
 function randomName() {
     const color = random(colors);
     let plant = random(plants);

myt.js

@@ -19,7 +19,7 @@ class Myt {
         params: {
             remote: 'Name of remote to use',
             workspace: 'The base directory of the project',
-            debug: 'Wether to enable debug mode',
+            debug: 'Whether to enable debug mode',
             version: 'Display the version number and exit',
             help: 'Display this help message'
         }

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@verdnatura/myt",
-  "version": "1.6.9",
+  "version": "1.6.10",
   "author": "Verdnatura Levante SL",
   "description": "MySQL version control",
   "license": "GPL-3.0",