express-admin/lib/sql/query.js

var instance = require('../'),
    x = null;


exports.sql = function (name) {
    switch (name) {

    case 'show-tables':

        return x.dialect == 'mysql'
        ? "SHOW TABLES IN `{0}` ;"
        : (x.dialect == 'pg'
            ? "SELECT table_name FROM information_schema.tables WHERE table_schema = '{0}' ;"
            // sqlite
            : "SELECT * FROM sqlite_master WHERE type = 'table' ;"
        );

    case 'show-columns':

        return x.dialect == 'mysql'
        ? "SHOW COLUMNS IN `{0}` IN `{1}` ;"
        : (x.dialect == 'pg'
            ? 'SELECT cs.column_name AS "Field", cs.data_type AS "Type", '+
                'cs.is_nullable AS "Null", tc.constraint_type AS "Key", '+
                'cs.column_default AS "Default", '+
                'cs.numeric_precision, cs.numeric_precision_radix, cs.numeric_scale, '+
                'cs.character_maximum_length '+
                'FROM "information_schema"."columns" cs '+
                'LEFT JOIN "information_schema"."key_column_usage" kc '+
                '	ON cs.column_name = kc.column_name '+
                '	AND cs.table_schema = kc.table_schema '+
                '	AND cs.table_name = kc.table_name '+
                'LEFT JOIN "information_schema"."table_constraints" tc '+
                '	ON kc.constraint_name = tc.constraint_name '+
                '	AND kc.table_schema = tc.table_schema '+
                '	AND kc.table_name = tc.table_name '+
                'WHERE '+
                '	cs.table_name = \'{0}\' '+
                '	AND cs.table_schema = \'{1}\' ;'
            // sqlite
            : "PRAGMA table_info('{0}') ;"
        );
    }
}

exports.replace = function () {
    if (!arguments.length) return null;

    x = instance.x;

    var sql = this.sql(arguments[0]);
    if (arguments.length > 1) {
        [].splice.call(arguments, 0, 1);
        for (var i=0; i < arguments.length; i++) {
            sql = sql.replace('{'+i+'}', arguments[i]);
        }
    }
    return sql;
}