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feat: query to fetch unique columns #580

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feat: query to fetch unique columns #580

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23 changes: 23 additions & 0 deletions lib/discovery.js
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Original file line number Diff line number Diff line change
Expand Up @@ -298,6 +298,29 @@ function mixinDiscovery(MySQL, mysql) {
return sql;
};

/**
* Discover unique keys for a given table
* @param {String} table The table name
* @param {Object} options The options for discovery
*/

/*!
* Retrieves a list of column names that have unique key index
* @param schema
* @param table
* @returns {string}
*/
MySQL.prototype.buildQueryUniqueKeys = function(schema, table) {
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can we write a test case for this ?

const sql = 'SELECT Column_name AS "columnName",' +
' table_schema AS "owner",' +
' table_name AS "tableName"' +
' FROM Information_schema.statistics' +
' WHERE Table_schema = ' + mysql.escape(schema) +
' AND Table_name = ' + mysql.escape(table) +
' AND Non_unique = 0 AND Index_name <> \'PRIMARY\';';
return sql;
};

/**
* Discover foreign keys that reference to the primary key of this table
* @param {String} table The table name
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