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/**
* Copyright 2010-2016 Boxfuse GmbH
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.flywaydb.core.internal.dbsupport.postgresql;
import org.flywaydb.core.internal.dbsupport.JdbcTemplate;
import org.flywaydb.core.internal.dbsupport.Schema;
import org.flywaydb.core.internal.dbsupport.Table;
import org.flywaydb.core.internal.dbsupport.Type;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
/**
* PostgreSQL implementation of Schema.
*/
public class PostgreSQLSchema extends Schema {
/**
* Creates a new PostgreSQL schema.
*
* @param jdbcTemplate The Jdbc Template for communicating with the DB.
* @param dbSupport The database-specific support.
* @param name The name of the schema.
*/
public PostgreSQLSchema(JdbcTemplate jdbcTemplate, PostgreSQLDbSupport dbSupport, String name) {
super(jdbcTemplate, dbSupport, name);
}
@Override
protected boolean doExists() throws SQLException {
return jdbcTemplate.queryForInt("SELECT COUNT(*) FROM pg_namespace WHERE nspname=?", name) > 0;
}
@Override
protected boolean doEmpty() throws SQLException {
int objectCount = jdbcTemplate.queryForInt(
"SELECT count(*) FROM information_schema.tables WHERE table_schema=? AND table_type='BASE TABLE'",
name);
return objectCount == 0;
}
@Override
protected void doCreate() throws SQLException {
jdbcTemplate.execute("CREATE SCHEMA " + dbSupport.quote(name));
}
@Override
protected void doDrop() throws SQLException {
jdbcTemplate.execute("DROP SCHEMA " + dbSupport.quote(name) + " CASCADE");
}
@Override
protected void doClean() throws SQLException {
int databaseMajorVersion = jdbcTemplate.getMetaData().getDatabaseMajorVersion();
int databaseMinorVersion = jdbcTemplate.getMetaData().getDatabaseMinorVersion();
if ((databaseMajorVersion > 9) || ((databaseMajorVersion == 9) && (databaseMinorVersion >= 3))) {
// PostgreSQL 9.3 and newer only
for (String statement : generateDropStatementsForMaterializedViews()) {
jdbcTemplate.execute(statement);
}
}
for (String statement : generateDropStatementsForViews()) {
jdbcTemplate.execute(statement);
}
for (Table table : allTables()) {
table.drop();
}
for (String statement : generateDropStatementsForSequences()) {
jdbcTemplate.execute(statement);
}
for (String statement : generateDropStatementsForBaseTypes(true)) {
jdbcTemplate.execute(statement);
}
for (String statement : generateDropStatementsForAggregates()) {
jdbcTemplate.execute(statement);
}
for (String statement : generateDropStatementsForRoutines()) {
jdbcTemplate.execute(statement);
}
for (String statement : generateDropStatementsForEnums()) {
jdbcTemplate.execute(statement);
}
for (String statement : generateDropStatementsForDomains()) {
jdbcTemplate.execute(statement);
}
for (String statement : generateDropStatementsForBaseTypes(false)) {
jdbcTemplate.execute(statement);
}
}
/**
* Generates the statements for dropping the sequences in this schema.
*
* @return The drop statements.
* @throws SQLException when the clean statements could not be generated.
*/
private List generateDropStatementsForSequences() throws SQLException {
List sequenceNames =
jdbcTemplate.queryForStringList(
"SELECT sequence_name FROM information_schema.sequences WHERE sequence_schema=?", name);
List statements = new ArrayList();
for (String sequenceName : sequenceNames) {
statements.add("DROP SEQUENCE IF EXISTS " + dbSupport.quote(name, sequenceName));
}
return statements;
}
/**
* Generates the statements for dropping the types in this schema.
*
* @param recreate Flag indicating whether the types should be recreated. Necessary for type-function chicken and egg problem.
* @return The drop statements.
* @throws SQLException when the clean statements could not be generated.
*/
private List generateDropStatementsForBaseTypes(boolean recreate) throws SQLException {
List> rows =
jdbcTemplate.queryForList(
"select typname, typcategory from pg_catalog.pg_type t "
+ "where (t.typrelid = 0 OR (SELECT c.relkind = 'c' FROM pg_catalog.pg_class c WHERE c.oid = t.typrelid)) and "
+ "NOT EXISTS(SELECT 1 FROM pg_catalog.pg_type el WHERE el.oid = t.typelem AND el.typarray = t.oid) and "
+ "t.typnamespace in (select oid from pg_catalog.pg_namespace where nspname = ?)",
name);
List statements = new ArrayList();
for (Map row : rows) {
statements.add("DROP TYPE IF EXISTS " + dbSupport.quote(name, row.get("typname")) + " CASCADE");
}
if (recreate) {
for (Map row : rows) {
// Only recreate Pseudo-types (P) and User-defined types (U)
if (Arrays.asList("P", "U").contains(row.get("typcategory"))) {
statements.add("CREATE TYPE " + dbSupport.quote(name, row.get("typname")));
}
}
}
return statements;
}
/**
* Generates the statements for dropping the aggregates in this schema.
*
* @return The drop statements.
* @throws SQLException when the clean statements could not be generated.
*/
private List generateDropStatementsForAggregates() throws SQLException {
List> rows =
jdbcTemplate.queryForList(
"SELECT proname, oidvectortypes(proargtypes) AS args "
+ "FROM pg_proc INNER JOIN pg_namespace ns ON (pg_proc.pronamespace = ns.oid) "
+ "WHERE pg_proc.proisagg = true AND ns.nspname = ?",
name
);
List statements = new ArrayList();
for (Map row : rows) {
statements.add("DROP AGGREGATE IF EXISTS " + dbSupport.quote(name, row.get("proname")) + "(" + row.get("args") + ") CASCADE");
}
return statements;
}
/**
* Generates the statements for dropping the routines in this schema.
*
* @return The drop statements.
* @throws SQLException when the clean statements could not be generated.
*/
private List generateDropStatementsForRoutines() throws SQLException {
List> rows =
jdbcTemplate.queryForList(
// Search for all functions
"SELECT proname, oidvectortypes(proargtypes) AS args "
+ "FROM pg_proc INNER JOIN pg_namespace ns ON (pg_proc.pronamespace = ns.oid) "
// that don't depend on an extension
+ "LEFT JOIN pg_depend dep ON dep.objid = pg_proc.oid AND dep.deptype = 'e' "
+ "WHERE pg_proc.proisagg = false AND ns.nspname = ? AND dep.objid IS NULL",
name
);
List statements = new ArrayList();
for (Map row : rows) {
statements.add("DROP FUNCTION IF EXISTS " + dbSupport.quote(name, row.get("proname")) + "(" + row.get("args") + ") CASCADE");
}
return statements;
}
/**
* Generates the statements for dropping the enums in this schema.
*
* @return The drop statements.
* @throws SQLException when the clean statements could not be generated.
*/
private List generateDropStatementsForEnums() throws SQLException {
List enumNames =
jdbcTemplate.queryForStringList(
"SELECT t.typname FROM pg_catalog.pg_type t INNER JOIN pg_catalog.pg_namespace n ON n.oid = t.typnamespace WHERE n.nspname = ? and t.typtype = 'e'", name);
List statements = new ArrayList();
for (String enumName : enumNames) {
statements.add("DROP TYPE " + dbSupport.quote(name, enumName));
}
return statements;
}
/**
* Generates the statements for dropping the domains in this schema.
*
* @return The drop statements.
* @throws SQLException when the clean statements could not be generated.
*/
private List generateDropStatementsForDomains() throws SQLException {
List domainNames =
jdbcTemplate.queryForStringList(
"SELECT domain_name FROM information_schema.domains WHERE domain_schema=?", name);
List statements = new ArrayList();
for (String domainName : domainNames) {
statements.add("DROP DOMAIN " + dbSupport.quote(name, domainName));
}
return statements;
}
/**
* Generates the statements for dropping the materialized views in this schema.
*
* @return The drop statements.
* @throws SQLException when the clean statements could not be generated.
*/
private List generateDropStatementsForMaterializedViews() throws SQLException {
List viewNames =
jdbcTemplate.queryForStringList(
"SELECT relname FROM pg_catalog.pg_class c JOIN pg_namespace n ON n.oid = c.relnamespace"
+ " WHERE c.relkind = 'm' AND n.nspname = ?", name);
List statements = new ArrayList();
for (String domainName : viewNames) {
statements.add("DROP MATERIALIZED VIEW IF EXISTS " + dbSupport.quote(name, domainName) + " CASCADE");
}
return statements;
}
/**
* Generates the statements for dropping the views in this schema.
*
* @return The drop statements.
* @throws SQLException when the clean statements could not be generated.
*/
private List generateDropStatementsForViews() throws SQLException {
List viewNames =
jdbcTemplate.queryForStringList(
// Search for all views
"SELECT relname FROM pg_catalog.pg_class c JOIN pg_namespace n ON n.oid = c.relnamespace" +
// that don't depend on an extension
" LEFT JOIN pg_depend dep ON dep.objid = c.oid AND dep.deptype = 'e'" +
" WHERE c.relkind = 'v' AND n.nspname = ? AND dep.objid IS NULL",
name);
List statements = new ArrayList();
for (String domainName : viewNames) {
statements.add("DROP VIEW IF EXISTS " + dbSupport.quote(name, domainName) + " CASCADE");
}
return statements;
}
@Override
protected Table[] doAllTables() throws SQLException {
List tableNames =
jdbcTemplate.queryForStringList(
//Search for all the table names
"SELECT t.table_name FROM information_schema.tables t" +
//in this schema
" WHERE table_schema=?" +
//that are real tables (as opposed to views)
" AND table_type='BASE TABLE'" +
//and are not child tables (= do not inherit from another table).
" AND NOT (SELECT EXISTS (SELECT inhrelid FROM pg_catalog.pg_inherits" +
" WHERE inhrelid = (quote_ident(t.table_schema)||'.'||quote_ident(t.table_name))::regclass::oid))",
name
);
//Views and child tables are excluded as they are dropped with the parent table when using cascade.
Table[] tables = new Table[tableNames.size()];
for (int i = 0; i < tableNames.size(); i++) {
tables[i] = new PostgreSQLTable(jdbcTemplate, dbSupport, this, tableNames.get(i));
}
return tables;
}
@Override
public Table getTable(String tableName) {
return new PostgreSQLTable(jdbcTemplate, dbSupport, this, tableName);
}
@Override
protected Type getType(String typeName) {
return new PostgreSQLType(jdbcTemplate, dbSupport, this, typeName);
}
}
