Examples with Database org.h2.engine.Database used on opensource projects

Example 16 with Database

use of org.h2.engine.Database in project h2database by h2database.

the class Parser method readFunctionWithoutParameters.

private Expression readFunctionWithoutParameters(String name) {
    if (readIf("(")) {
        read(")");
    }
    if (database.isAllowBuiltinAliasOverride()) {
        FunctionAlias functionAlias = database.getSchema(session.getCurrentSchemaName()).findFunction(name);
        if (functionAlias != null) {
            return new JavaFunction(functionAlias, new Expression[0]);
        }
    }
    Function function = Function.getFunction(database, name);
    function.doneWithParameters();
    return function;
}

Example 17 with Database

use of org.h2.engine.Database in project h2database by h2database.

the class AlterSchemaRename method update.

@Override
public int update() {
    session.commit(true);
    Database db = session.getDatabase();
    if (!oldSchema.canDrop()) {
        throw DbException.get(ErrorCode.SCHEMA_CAN_NOT_BE_DROPPED_1, oldSchema.getName());
    }
    if (db.findSchema(newSchemaName) != null || newSchemaName.equals(oldSchema.getName())) {
        throw DbException.get(ErrorCode.SCHEMA_ALREADY_EXISTS_1, newSchemaName);
    }
    session.getUser().checkSchemaAdmin();
    db.renameDatabaseObject(session, oldSchema, newSchemaName);
    ArrayList<SchemaObject> all = db.getAllSchemaObjects();
    for (SchemaObject schemaObject : all) {
        db.updateMeta(session, schemaObject);
    }
    return 0;
}

Example 18 with Database

use of org.h2.engine.Database in project h2database by h2database.

the class AlterTableAlterColumn method cloneTableStructure.

private Table cloneTableStructure(Table table, Column[] columns, Database db, String tempName, ArrayList<Column> newColumns) {
    for (Column col : columns) {
        newColumns.add(col.getClone());
    }
    if (type == CommandInterface.ALTER_TABLE_DROP_COLUMN) {
        for (Column removeCol : columnsToRemove) {
            Column foundCol = null;
            for (Column newCol : newColumns) {
                if (newCol.getName().equals(removeCol.getName())) {
                    foundCol = newCol;
                    break;
                }
            }
            if (foundCol == null) {
                throw DbException.throwInternalError(removeCol.getCreateSQL());
            }
            newColumns.remove(foundCol);
        }
    } else if (type == CommandInterface.ALTER_TABLE_ADD_COLUMN) {
        int position;
        if (addFirst) {
            position = 0;
        } else if (addBefore != null) {
            position = table.getColumn(addBefore).getColumnId();
        } else if (addAfter != null) {
            position = table.getColumn(addAfter).getColumnId() + 1;
        } else {
            position = columns.length;
        }
        if (columnsToAdd != null) {
            for (Column column : columnsToAdd) {
                newColumns.add(position++, column);
            }
        }
    } else if (type == CommandInterface.ALTER_TABLE_ALTER_COLUMN_CHANGE_TYPE) {
        int position = oldColumn.getColumnId();
        newColumns.set(position, newColumn);
    }
    // create a table object in order to get the SQL statement
    // can't just use this table, because most column objects are 'shared'
    // with the old table
    // still need a new id because using 0 would mean: the new table tries
    // to use the rows of the table 0 (the meta table)
    int id = db.allocateObjectId();
    CreateTableData data = new CreateTableData();
    data.tableName = tempName;
    data.id = id;
    data.columns = newColumns;
    data.temporary = table.isTemporary();
    data.persistData = table.isPersistData();
    data.persistIndexes = table.isPersistIndexes();
    data.isHidden = table.isHidden();
    data.create = true;
    data.session = session;
    Table newTable = getSchema().createTable(data);
    newTable.setComment(table.getComment());
    StringBuilder buff = new StringBuilder();
    buff.append(newTable.getCreateSQL());
    StringBuilder columnList = new StringBuilder();
    for (Column nc : newColumns) {
        if (columnList.length() > 0) {
            columnList.append(", ");
        }
        if (type == CommandInterface.ALTER_TABLE_ADD_COLUMN && columnsToAdd != null && columnsToAdd.contains(nc)) {
            Expression def = nc.getDefaultExpression();
            columnList.append(def == null ? "NULL" : def.getSQL());
        } else {
            columnList.append(nc.getSQL());
        }
    }
    buff.append(" AS SELECT ");
    if (columnList.length() == 0) {
        // special case: insert into test select * from
        buff.append('*');
    } else {
        buff.append(columnList);
    }
    buff.append(" FROM ").append(table.getSQL());
    String newTableSQL = buff.toString();
    String newTableName = newTable.getName();
    Schema newTableSchema = newTable.getSchema();
    newTable.removeChildrenAndResources(session);
    execute(newTableSQL, true);
    newTable = newTableSchema.getTableOrView(session, newTableName);
    ArrayList<String> triggers = New.arrayList();
    for (DbObject child : table.getChildren()) {
        if (child instanceof Sequence) {
            continue;
        } else if (child instanceof Index) {
            Index idx = (Index) child;
            if (idx.getIndexType().getBelongsToConstraint()) {
                continue;
            }
        }
        String createSQL = child.getCreateSQL();
        if (createSQL == null) {
            continue;
        }
        if (child instanceof TableView) {
            continue;
        } else if (child.getType() == DbObject.TABLE_OR_VIEW) {
            DbException.throwInternalError();
        }
        String quotedName = Parser.quoteIdentifier(tempName + "_" + child.getName());
        String sql = null;
        if (child instanceof ConstraintReferential) {
            ConstraintReferential r = (ConstraintReferential) child;
            if (r.getTable() != table) {
                sql = r.getCreateSQLForCopy(r.getTable(), newTable, quotedName, false);
            }
        }
        if (sql == null) {
            sql = child.getCreateSQLForCopy(newTable, quotedName);
        }
        if (sql != null) {
            if (child instanceof TriggerObject) {
                triggers.add(sql);
            } else {
                execute(sql, true);
            }
        }
    }
    table.setModified();
    // otherwise the sequence is dropped if the table is dropped
    for (Column col : newColumns) {
        Sequence seq = col.getSequence();
        if (seq != null) {
            table.removeSequence(seq);
            col.setSequence(null);
        }
    }
    for (String sql : triggers) {
        execute(sql, true);
    }
    return newTable;
}

Example 19 with Database

use of org.h2.engine.Database in project h2database by h2database.

the class AlterTableAlterColumn method copyData.

private void copyData(Table table, ArrayList<Sequence> sequences, boolean createConstraints) {
    if (table.isTemporary()) {
        throw DbException.getUnsupportedException("TEMP TABLE");
    }
    Database db = session.getDatabase();
    String baseName = table.getName();
    String tempName = db.getTempTableName(baseName, session);
    Column[] columns = table.getColumns();
    ArrayList<Column> newColumns = New.arrayList();
    Table newTable = cloneTableStructure(table, columns, db, tempName, newColumns);
    if (sequences != null) {
        for (Sequence sequence : sequences) {
            table.addSequence(sequence);
        }
    }
    try {
        // check if a view would become invalid
        // (because the column to drop is referenced or so)
        checkViews(table, newTable);
    } catch (DbException e) {
        execute("DROP TABLE " + newTable.getName(), true);
        throw DbException.get(ErrorCode.VIEW_IS_INVALID_2, e, getSQL(), e.getMessage());
    }
    String tableName = table.getName();
    ArrayList<TableView> dependentViews = new ArrayList<>(table.getDependentViews());
    for (TableView view : dependentViews) {
        table.removeDependentView(view);
    }
    execute("DROP TABLE " + table.getSQL() + " IGNORE", true);
    db.renameSchemaObject(session, newTable, tableName);
    for (DbObject child : newTable.getChildren()) {
        if (child instanceof Sequence) {
            continue;
        }
        String name = child.getName();
        if (name == null || child.getCreateSQL() == null) {
            continue;
        }
        if (name.startsWith(tempName + "_")) {
            name = name.substring(tempName.length() + 1);
            SchemaObject so = (SchemaObject) child;
            if (so instanceof Constraint) {
                if (so.getSchema().findConstraint(session, name) != null) {
                    name = so.getSchema().getUniqueConstraintName(session, newTable);
                }
            } else if (so instanceof Index) {
                if (so.getSchema().findIndex(session, name) != null) {
                    name = so.getSchema().getUniqueIndexName(session, newTable, name);
                }
            }
            db.renameSchemaObject(session, so, name);
        }
    }
    if (createConstraints) {
        createConstraints();
    }
    for (TableView view : dependentViews) {
        String sql = view.getCreateSQL(true, true);
        execute(sql, true);
    }
}

Example 20 with Database

use of org.h2.engine.Database in project h2database by h2database.

the class AlterTableAlterColumn method checkViews.

/**
 * Check that all views and other dependent objects.
 */
private void checkViews(SchemaObject sourceTable, SchemaObject newTable) {
    String sourceTableName = sourceTable.getName();
    String newTableName = newTable.getName();
    Database db = sourceTable.getDatabase();
    // save the real table under a temporary name
    String temp = db.getTempTableName(sourceTableName, session);
    db.renameSchemaObject(session, sourceTable, temp);
    try {
        // have our new table impersonate the target table
        db.renameSchemaObject(session, newTable, sourceTableName);
        checkViewsAreValid(sourceTable);
    } finally {
        // always put the source tables back with their proper names
        try {
            db.renameSchemaObject(session, newTable, newTableName);
        } finally {
            db.renameSchemaObject(session, sourceTable, sourceTableName);
        }
    }
}