Examples with Db org.h2.jaqu.Db used on opensource projects

Example 16 with Db

use of org.h2.jaqu.Db in project h2database by h2database.

the class Analyze method analyzeTable.

/**
 * Analyze this table.
 *
 * @param session the session
 * @param table the table
 * @param sample the number of sample rows
 * @param manual whether the command was called by the user
 */
public static void analyzeTable(Session session, Table table, int sample, boolean manual) {
    if (table.getTableType() != TableType.TABLE || table.isHidden() || session == null) {
        return;
    }
    if (!manual) {
        if (session.getDatabase().isSysTableLocked()) {
            return;
        }
        if (table.hasSelectTrigger()) {
            return;
        }
    }
    if (table.isTemporary() && !table.isGlobalTemporary() && session.findLocalTempTable(table.getName()) == null) {
        return;
    }
    if (table.isLockedExclusively() && !table.isLockedExclusivelyBy(session)) {
        return;
    }
    if (!session.getUser().hasRight(table, Right.SELECT)) {
        return;
    }
    if (session.getCancel() != 0) {
        // if the connection is closed and there is something to undo
        return;
    }
    Column[] columns = table.getColumns();
    if (columns.length == 0) {
        return;
    }
    Database db = session.getDatabase();
    StatementBuilder buff = new StatementBuilder("SELECT ");
    for (Column col : columns) {
        buff.appendExceptFirst(", ");
        int type = col.getType();
        if (type == Value.BLOB || type == Value.CLOB) {
            // can not index LOB columns, so calculating
            // the selectivity is not required
            buff.append("MAX(NULL)");
        } else {
            buff.append("SELECTIVITY(").append(col.getSQL()).append(')');
        }
    }
    buff.append(" FROM ").append(table.getSQL());
    if (sample > 0) {
        buff.append(" LIMIT ? SAMPLE_SIZE ? ");
    }
    String sql = buff.toString();
    Prepared command = session.prepare(sql);
    if (sample > 0) {
        ArrayList<Parameter> params = command.getParameters();
        params.get(0).setValue(ValueInt.get(1));
        params.get(1).setValue(ValueInt.get(sample));
    }
    ResultInterface result = command.query(0);
    result.next();
    for (int j = 0; j < columns.length; j++) {
        Value v = result.currentRow()[j];
        if (v != ValueNull.INSTANCE) {
            int selectivity = v.getInt();
            columns[j].setSelectivity(selectivity);
        }
    }
    db.updateMeta(session, table);
}

Example 17 with Db

use of org.h2.jaqu.Db in project h2database by h2database.

the class CreateFunctionAlias method update.

@Override
public int update() {
    session.commit(true);
    session.getUser().checkAdmin();
    Database db = session.getDatabase();
    if (getSchema().findFunction(aliasName) != null) {
        if (!ifNotExists) {
            throw DbException.get(ErrorCode.FUNCTION_ALIAS_ALREADY_EXISTS_1, aliasName);
        }
    } else {
        int id = getObjectId();
        FunctionAlias functionAlias;
        if (javaClassMethod != null) {
            functionAlias = FunctionAlias.newInstance(getSchema(), id, aliasName, javaClassMethod, force, bufferResultSetToLocalTemp);
        } else {
            functionAlias = FunctionAlias.newInstanceFromSource(getSchema(), id, aliasName, source, force, bufferResultSetToLocalTemp);
        }
        functionAlias.setDeterministic(deterministic);
        db.addSchemaObject(session, functionAlias);
    }
    return 0;
}

Example 18 with Db

use of org.h2.jaqu.Db in project h2database by h2database.

the class CreateLinkedTable method update.

@Override
public int update() {
    session.commit(true);
    Database db = session.getDatabase();
    session.getUser().checkAdmin();
    if (getSchema().resolveTableOrView(session, tableName) != null) {
        if (ifNotExists) {
            return 0;
        }
        throw DbException.get(ErrorCode.TABLE_OR_VIEW_ALREADY_EXISTS_1, tableName);
    }
    int id = getObjectId();
    TableLink table = getSchema().createTableLink(id, tableName, driver, url, user, password, originalSchema, originalTable, emitUpdates, force);
    table.setTemporary(temporary);
    table.setGlobalTemporary(globalTemporary);
    table.setComment(comment);
    table.setReadOnly(readOnly);
    if (temporary && !globalTemporary) {
        session.addLocalTempTable(table);
    } else {
        db.addSchemaObject(session, table);
    }
    return 0;
}

Example 19 with Db

use of org.h2.jaqu.Db in project h2database by h2database.

the class Query method sameResultAsLast.

private boolean sameResultAsLast(Session s, Value[] params, Value[] lastParams, long lastEval) {
    if (!cacheableChecked) {
        long max = getMaxDataModificationId();
        noCache = max == Long.MAX_VALUE;
        cacheableChecked = true;
    }
    if (noCache) {
        return false;
    }
    Database db = s.getDatabase();
    for (int i = 0; i < params.length; i++) {
        Value a = lastParams[i], b = params[i];
        if (a.getType() != b.getType() || !db.areEqual(a, b)) {
            return false;
        }
    }
    if (!isEverything(ExpressionVisitor.DETERMINISTIC_VISITOR) || !isEverything(ExpressionVisitor.INDEPENDENT_VISITOR)) {
        return false;
    }
    if (db.getModificationDataId() > lastEval && getMaxDataModificationId() > lastEval) {
        return false;
    }
    return true;
}

Example 20 with Db

use of org.h2.jaqu.Db in project h2database by h2database.

the class ScriptCommand method query.

@Override
public ResultInterface query(int maxrows) {
    session.getUser().checkAdmin();
    reset();
    Database db = session.getDatabase();
    if (schemaNames != null) {
        for (String schemaName : schemaNames) {
            Schema schema = db.findSchema(schemaName);
            if (schema == null) {
                throw DbException.get(ErrorCode.SCHEMA_NOT_FOUND_1, schemaName);
            }
        }
    }
    try {
        result = createResult();
        deleteStore();
        openOutput();
        if (out != null) {
            buffer = new byte[Constants.IO_BUFFER_SIZE];
        }
        if (settings) {
            for (Setting setting : db.getAllSettings()) {
                if (setting.getName().equals(SetTypes.getTypeName(SetTypes.CREATE_BUILD))) {
                    // (it is only set when creating the database)
                    continue;
                }
                add(setting.getCreateSQL(), false);
            }
        }
        if (out != null) {
            add("", true);
        }
        for (User user : db.getAllUsers()) {
            add(user.getCreateSQL(passwords), false);
        }
        for (Role role : db.getAllRoles()) {
            add(role.getCreateSQL(true), false);
        }
        for (Schema schema : db.getAllSchemas()) {
            if (excludeSchema(schema)) {
                continue;
            }
            add(schema.getCreateSQL(), false);
        }
        for (UserDataType datatype : db.getAllUserDataTypes()) {
            if (drop) {
                add(datatype.getDropSQL(), false);
            }
            add(datatype.getCreateSQL(), false);
        }
        for (SchemaObject obj : db.getAllSchemaObjects(DbObject.CONSTANT)) {
            if (excludeSchema(obj.getSchema())) {
                continue;
            }
            Constant constant = (Constant) obj;
            add(constant.getCreateSQL(), false);
        }
        final ArrayList<Table> tables = db.getAllTablesAndViews(false);
        // sort by id, so that views are after tables and views on views
        // after the base views
        Collections.sort(tables, new Comparator<Table>() {

            @Override
            public int compare(Table t1, Table t2) {
                return t1.getId() - t2.getId();
            }
        });
        // Generate the DROP XXX  ... IF EXISTS
        for (Table table : tables) {
            if (excludeSchema(table.getSchema())) {
                continue;
            }
            if (excludeTable(table)) {
                continue;
            }
            if (table.isHidden()) {
                continue;
            }
            table.lock(session, false, false);
            String sql = table.getCreateSQL();
            if (sql == null) {
                // null for metadata tables
                continue;
            }
            if (drop) {
                add(table.getDropSQL(), false);
            }
        }
        for (SchemaObject obj : db.getAllSchemaObjects(DbObject.FUNCTION_ALIAS)) {
            if (excludeSchema(obj.getSchema())) {
                continue;
            }
            if (drop) {
                add(obj.getDropSQL(), false);
            }
            add(obj.getCreateSQL(), false);
        }
        for (UserAggregate agg : db.getAllAggregates()) {
            if (drop) {
                add(agg.getDropSQL(), false);
            }
            add(agg.getCreateSQL(), false);
        }
        for (SchemaObject obj : db.getAllSchemaObjects(DbObject.SEQUENCE)) {
            if (excludeSchema(obj.getSchema())) {
                continue;
            }
            Sequence sequence = (Sequence) obj;
            if (drop) {
                add(sequence.getDropSQL(), false);
            }
            add(sequence.getCreateSQL(), false);
        }
        // Generate CREATE TABLE and INSERT...VALUES
        int count = 0;
        for (Table table : tables) {
            if (excludeSchema(table.getSchema())) {
                continue;
            }
            if (excludeTable(table)) {
                continue;
            }
            if (table.isHidden()) {
                continue;
            }
            table.lock(session, false, false);
            String createTableSql = table.getCreateSQL();
            if (createTableSql == null) {
                // null for metadata tables
                continue;
            }
            final TableType tableType = table.getTableType();
            add(createTableSql, false);
            final ArrayList<Constraint> constraints = table.getConstraints();
            if (constraints != null) {
                for (Constraint constraint : constraints) {
                    if (Constraint.Type.PRIMARY_KEY == constraint.getConstraintType()) {
                        add(constraint.getCreateSQLWithoutIndexes(), false);
                    }
                }
            }
            if (TableType.TABLE == tableType) {
                if (table.canGetRowCount()) {
                    String rowcount = "-- " + table.getRowCountApproximation() + " +/- SELECT COUNT(*) FROM " + table.getSQL();
                    add(rowcount, false);
                }
                if (data) {
                    count = generateInsertValues(count, table);
                }
            }
            final ArrayList<Index> indexes = table.getIndexes();
            for (int j = 0; indexes != null && j < indexes.size(); j++) {
                Index index = indexes.get(j);
                if (!index.getIndexType().getBelongsToConstraint()) {
                    add(index.getCreateSQL(), false);
                }
            }
        }
        if (tempLobTableCreated) {
            add("DROP TABLE IF EXISTS SYSTEM_LOB_STREAM", true);
            add("CALL SYSTEM_COMBINE_BLOB(-1)", true);
            add("DROP ALIAS IF EXISTS SYSTEM_COMBINE_CLOB", true);
            add("DROP ALIAS IF EXISTS SYSTEM_COMBINE_BLOB", true);
            tempLobTableCreated = false;
        }
        // Generate CREATE CONSTRAINT ...
        final ArrayList<SchemaObject> constraints = db.getAllSchemaObjects(DbObject.CONSTRAINT);
        Collections.sort(constraints, new Comparator<SchemaObject>() {

            @Override
            public int compare(SchemaObject c1, SchemaObject c2) {
                return ((Constraint) c1).compareTo((Constraint) c2);
            }
        });
        for (SchemaObject obj : constraints) {
            if (excludeSchema(obj.getSchema())) {
                continue;
            }
            Constraint constraint = (Constraint) obj;
            if (excludeTable(constraint.getTable())) {
                continue;
            }
            if (constraint.getTable().isHidden()) {
                continue;
            }
            if (Constraint.Type.PRIMARY_KEY != constraint.getConstraintType()) {
                add(constraint.getCreateSQLWithoutIndexes(), false);
            }
        }
        // Generate CREATE TRIGGER ...
        for (SchemaObject obj : db.getAllSchemaObjects(DbObject.TRIGGER)) {
            if (excludeSchema(obj.getSchema())) {
                continue;
            }
            TriggerObject trigger = (TriggerObject) obj;
            if (excludeTable(trigger.getTable())) {
                continue;
            }
            add(trigger.getCreateSQL(), false);
        }
        // Generate GRANT ...
        for (Right right : db.getAllRights()) {
            DbObject object = right.getGrantedObject();
            if (object != null) {
                if (object instanceof Schema) {
                    if (excludeSchema((Schema) object)) {
                        continue;
                    }
                } else if (object instanceof Table) {
                    Table table = (Table) object;
                    if (excludeSchema(table.getSchema())) {
                        continue;
                    }
                    if (excludeTable(table)) {
                        continue;
                    }
                }
            }
            add(right.getCreateSQL(), false);
        }
        // Generate COMMENT ON ...
        for (Comment comment : db.getAllComments()) {
            add(comment.getCreateSQL(), false);
        }
        if (out != null) {
            out.close();
        }
    } catch (IOException e) {
        throw DbException.convertIOException(e, getFileName());
    } finally {
        closeIO();
    }
    result.done();
    LocalResult r = result;
    reset();
    return r;
}