refactor(mysql): moved specific queries inside MySQLClient class

src/main/libs/clients/MySQLClient.js

@@ -154,6 +154,72 @@ export class MySQLClient extends AntaresCore {
       });
    }
 
+   /**
+    * @param {Object} params
+    * @param {String} params.schema
+    * @param {String} params.table
+    * @returns {Object} table scructure
+    * @memberof MySQLClient
+    */
+   async getTableColumns ({ schema, table }) {
+      const { rows } = await this
+         .select('*')
+         .schema('information_schema')
+         .from('COLUMNS')
+         .where({ TABLE_SCHEMA: `= '${schema}'`, TABLE_NAME: `= '${table}'` })
+         .orderBy({ ORDINAL_POSITION: 'ASC' })
+         .run();
+
+      return rows.map(field => {
+         return {
+            name: field.COLUMN_NAME,
+            key: field.COLUMN_KEY.toLowerCase(),
+            type: field.DATA_TYPE,
+            schema: field.TABLE_SCHEMA,
+            table: field.TABLE_NAME,
+            numPrecision: field.NUMERIC_PRECISION,
+            datePrecision: field.DATETIME_PRECISION,
+            charLength: field.CHARACTER_MAXIMUM_LENGTH,
+            isNullable: field.IS_NULLABLE,
+            default: field.COLUMN_DEFAULT,
+            charset: field.CHARACTER_SET_NAME,
+            collation: field.COLLATION_NAME,
+            autoIncrement: field.EXTRA.includes('auto_increment'),
+            comment: field.COLUMN_COMMENT
+         };
+      });
+   }
+
+   /**
+    * @param {Object} params
+    * @param {String} params.schema
+    * @param {String} params.table
+    * @returns {Object} table key usage
+    * @memberof MySQLClient
+    */
+   async getKeyUsage ({ schema, table }) {
+      const { rows } = await this
+         .select('*')
+         .schema('information_schema')
+         .from('KEY_COLUMN_USAGE')
+         .where({ TABLE_SCHEMA: `= '${schema}'`, TABLE_NAME: `= '${table}'`, REFERENCED_TABLE_NAME: 'IS NOT NULL' })
+         .run();
+
+      return rows.map(field => {
+         return {
+            schema: field.TABLE_SCHEMA,
+            table: field.TABLE_NAME,
+            column: field.COLUMN_NAME,
+            position: field.ORDINAL_POSITION,
+            constraintPosition: field.POSITION_IN_UNIQUE_CONSTRAINT,
+            constraintName: field.CONSTRAINT_NAME,
+            refSchema: field.REFERENCED_TABLE_SCHEMA,
+            refTable: field.REFERENCED_TABLE_NAME,
+            refColumn: field.REFERENCED_COLUMN_NAME
+         };
+      });
+   }
+
    /**
     * SHOW COLLATION
     *