mirror of https://github.com/perkeep/perkeep.git
104 lines
2.3 KiB
Go
104 lines
2.3 KiB
Go
/*
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Copyright 2012 The Camlistore Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package postgres
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const requiredSchemaVersion = 1
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func SchemaVersion() int {
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return requiredSchemaVersion
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}
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// TODO(mpl): use hstore
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func SQLCreateTables() []string {
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return []string{
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`CREATE TABLE rows (
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k VARCHAR(255) NOT NULL PRIMARY KEY,
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v VARCHAR(255))`,
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`CREATE TABLE meta (
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metakey VARCHAR(255) NOT NULL PRIMARY KEY,
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value VARCHAR(255) NOT NULL)`,
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}
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}
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func SQLDefineReplace() []string {
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return []string{
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// The first 3 statements here are a work around that allows us to issue
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// the "CREATE LANGUAGE plpsql;" statement only if the language doesn't
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// already exist.
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`CREATE OR REPLACE FUNCTION create_language_plpgsql() RETURNS INTEGER AS
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$$
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CREATE LANGUAGE plpgsql;
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SELECT 1;
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$$
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LANGUAGE SQL;`,
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`SELECT CASE WHEN NOT
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(
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SELECT TRUE AS exists
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FROM pg_language
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WHERE lanname = 'plpgsql'
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UNION
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SELECT FALSE AS exists
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ORDER BY exists DESC
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LIMIT 1
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)
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THEN
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create_language_plpgsql()
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ELSE
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0
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END AS plpgsql_created;`,
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`DROP FUNCTION create_language_plpgsql();`,
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`CREATE OR REPLACE FUNCTION replaceinto(key TEXT, value TEXT) RETURNS VOID AS
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$$
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BEGIN
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LOOP
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UPDATE rows SET v = value WHERE k = key;
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IF found THEN
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RETURN;
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END IF;
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BEGIN
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INSERT INTO rows(k,v) VALUES (key, value);
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RETURN;
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EXCEPTION WHEN unique_violation THEN
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END;
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END LOOP;
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END;
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$$
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LANGUAGE plpgsql;`,
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`CREATE OR REPLACE FUNCTION replaceintometa(key TEXT, val TEXT) RETURNS VOID AS
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$$
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BEGIN
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LOOP
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UPDATE meta SET value = val WHERE metakey = key;
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IF found THEN
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RETURN;
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END IF;
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BEGIN
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INSERT INTO meta(metakey,value) VALUES (key, val);
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RETURN;
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EXCEPTION WHEN unique_violation THEN
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END;
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END LOOP;
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END;
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$$
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LANGUAGE plpgsql;`,
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}
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}
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