/*
* Copyright 2010-2017 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.db2zos;
import org.flywaydb.core.internal.dbsupport.Function;
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.List;
/**
* DB2 implementation of Schema.
*/
public class DB2zosSchema extends Schema<DB2zosDbSupport> {
/**
* Creates a new DB2 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 DB2zosSchema(JdbcTemplate jdbcTemplate, DB2zosDbSupport dbSupport, String name) {
super(jdbcTemplate, dbSupport, name);
}
@Override
protected boolean doExists() throws SQLException {
return jdbcTemplate.queryForInt("SELECT COUNT(*) FROM sysibm.sysdatabase WHERE name=?", name) > 0;
}
@Override
protected boolean doEmpty() throws SQLException {
int objectCount = jdbcTemplate.queryForInt("select count(*) from sysibm.systables where dbname = ?", name);
objectCount += jdbcTemplate.queryForInt("select count(*) from sysibm.systables where creator = ?", name);
objectCount += jdbcTemplate.queryForInt("select count(*) from sysibm.syssequences where schema = ?", name);
objectCount += jdbcTemplate.queryForInt("select count(*) from sysibm.sysindexes where dbname = ?", name);
objectCount += jdbcTemplate.queryForInt("select count(*) from sysibm.sysroutines where schema = ?", name);
return objectCount == 0;
}
@Override
protected void doCreate() throws SQLException {
throw new UnsupportedOperationException("Create Schema - is not supported in db2 on zOS");
}
@Override
protected void doDrop() throws SQLException {
throw new UnsupportedOperationException("Drop Schema - is not supported in db2 on zOS");
}
@Override
protected void doClean() throws SQLException {
// MQTs are dropped when the backing views or tables are dropped
// Indexes in DB2 are dropped when the corresponding table is dropped
// views
for (String dropStatement : generateDropStatements(name, "V", "VIEW")) {
jdbcTemplate.execute(dropStatement);
}
// aliases
for (String dropStatement : generateDropStatements(name, "A", "ALIAS")) {
jdbcTemplate.execute(dropStatement);
}
for (Table table : allTables()) {
table.drop();
}
// slett testtabeller
for (String dropStatement : generateDropStatementsForTestTable(name, "T", "TABLE")) {
jdbcTemplate.execute(dropStatement);
}
// tablespace
for (String dropStatement : generateDropStatementsForTablespace(name)) {
jdbcTemplate.execute(dropStatement);
}
// sequences
for (String dropStatement : generateDropStatementsForSequences(name)) {
jdbcTemplate.execute(dropStatement);
}
// procedures
for (String dropStatement : generateDropStatementsForProcedures(name)) {
jdbcTemplate.execute(dropStatement);
}
// functions
for (String dropStatement : generateDropStatementsForFunctions(name)) {
jdbcTemplate.execute(dropStatement);
}
// usertypes
for (String dropStatement : generateDropStatementsForUserTypes(name)) {
jdbcTemplate.execute(dropStatement);
}
}
/**
* Generates DROP statements for the procedures in this schema.
*
* @param schema The schema of the objects.
* @return The drop statements.
* @throws java.sql.SQLException when the statements could not be generated.
*/
private List<String> generateDropStatementsForProcedures(String schema) throws SQLException {
String dropProcGenQuery = "select rtrim(NAME) from SYSIBM.SYSROUTINES where CAST_FUNCTION = 'N' " +
" and ROUTINETYPE = 'P' and SCHEMA = '" + schema + "'";
return buildDropStatements("DROP PROCEDURE", dropProcGenQuery, schema);
}
/**
* Generates DROP statements for the functions in this schema.
*
* @param schema The schema of the objects.
* @return The drop statements.
* @throws java.sql.SQLException when the statements could not be generated.
*/
private List<String> generateDropStatementsForFunctions(String schema) throws SQLException {
String dropProcGenQuery = "select rtrim(NAME) from SYSIBM.SYSROUTINES where CAST_FUNCTION = 'N' " +
" and ROUTINETYPE = 'F' and SCHEMA = '" + schema + "'";
return buildDropStatements("DROP FUNCTION", dropProcGenQuery, schema);
}
/**
* Generates DROP statements for the sequences in this schema.
*
* @param schema The schema of the objects.
* @return The drop statements.
* @throws java.sql.SQLException when the statements could not be generated.
*/
private List<String> generateDropStatementsForSequences(String schema) throws SQLException {
String dropSeqGenQuery = "select rtrim(NAME) from SYSIBM.SYSSEQUENCES where SCHEMA = '" + schema
+ "' and SEQTYPE='S'";
return buildDropStatements("DROP SEQUENCE", dropSeqGenQuery, schema);
}
/**
* Generates DROP statements for the tablespace in this schema.
*
* @param schema The schema of the objects.
* @return The drop statements.
* @throws java.sql.SQLException when the statements could not be generated.
*/
private List<String> generateDropStatementsForTablespace(String schema) throws SQLException {
String dropTablespaceGenQuery = "select rtrim(NAME) FROM SYSIBM.SYSTABLESPACE where DBNAME = '" + schema + "'";
return buildDropStatements("DROP TABLESPACE", dropTablespaceGenQuery, schema);
}
/**
* Generates DROP statements for this type of table, representing this type of object in this schema.
*
* @param schema The schema of the objects.
* @param tableType The type of table (Can be T, V, S, ...).
* @param objectType The type of object.
* @return The drop statements.
* @throws java.sql.SQLException when the statements could not be generated.
*/
private List<String> generateDropStatementsForTestTable(String schema, String tableType, String objectType) throws SQLException {
String dropTablesGenQuery = "select rtrim(NAME) from SYSIBM.SYSTABLES where TYPE='" + tableType + "' and creator = '"
+ schema + "'";
return buildDropStatements("DROP " + objectType, dropTablesGenQuery, schema);
}
/**
* Generates DROP statements for the user defines types in this schema.
*
* @param schema The schema of the objects.
* @return The drop statements.
* @throws java.sql.SQLException when the statements could not be generated.
*/
private List<String> generateDropStatementsForUserTypes(String schema) throws SQLException {
String dropTablespaceGenQuery = "select rtrim(NAME) from SYSIBM.SYSDATATYPES where schema = '" + schema + "'";
return buildDropStatements("DROP TYPE", dropTablespaceGenQuery, schema);
}
/**
* Generates DROP statements for this type of table, representing this type of object in this schema.
*
* @param schema The schema of the objects.
* @param tableType The type of table (Can be T, V, S, ...).
* @param objectType The type of object.
* @return The drop statements.
* @throws java.sql.SQLException when the statements could not be generated.
*/
private List<String> generateDropStatements(String schema, String tableType, String objectType) throws SQLException {
String dropTablesGenQuery = "select rtrim(NAME) from SYSIBM.SYSTABLES where TYPE='" + tableType + "' and (DBNAME = '"
+ schema + "' OR creator = '" + schema + "')";
return buildDropStatements("DROP " + objectType, dropTablesGenQuery, schema);
}
/**
* Builds the drop statements for database objects in this schema.
*
* @param dropPrefix The drop command for the database object (e.g. 'drop table').
* @param query The query to get all present database objects
* @param schema The schema for which to build the statements.
* @return The statements.
* @throws java.sql.SQLException when the drop statements could not be built.
*/
private List<String> buildDropStatements(final String dropPrefix, final String query, String schema) throws SQLException {
List<String> dropStatements = new ArrayList<String>();
List<String> dbObjects = jdbcTemplate.queryForStringList(query);
for (String dbObject : dbObjects) {
dropStatements.add(dropPrefix + " " + dbSupport.quote(schema, dbObject));
}
return dropStatements;
}
@Override
protected Table[] doAllTables() throws SQLException {
List<String> tableNames = jdbcTemplate.queryForStringList(
"select rtrim(NAME) from SYSIBM.SYSTABLES where TYPE='T' and DBNAME = ?", name);
Table[] tables = new Table[tableNames.size()];
for (int i = 0; i < tableNames.size(); i++) {
tables[i] = new DB2zosTable(jdbcTemplate, dbSupport, this, tableNames.get(i));
}
return tables;
}
@Override
public Table getTable(String tableName) {
return new DB2zosTable(jdbcTemplate, dbSupport, this, tableName);
}
@Override
protected Type getType(String typeName) {
return new DB2zosType(jdbcTemplate, dbSupport, this, typeName);
}
@Override
public Function getFunction(String functionName, String... args) {
return new DB2zosFunction(jdbcTemplate, dbSupport, this, functionName, args);
}
}