Java Code Examples for com.alibaba.druid.stat.TableStat#Condition

private static void pruningAndConditions(Map<String, String> tableAliasMap, String defaultSchema, ListIterator<TableStat.Condition> iteratorConditions) {
    while (iteratorConditions.hasNext()) {
        TableStat.Condition condition = iteratorConditions.next();
        List<Object> values = condition.getValues();
        if (values.size() == 0 || !checkConditionValues(values)) {
            if (LOGGER.isTraceEnabled()) {
                LOGGER.trace("condition [" + condition + "] will be pruned for empty values");
            }
            iteratorConditions.remove(); //AND CONDITION can be pruned
        } else {
            TableStat.Condition newCondition = getUsefulCondition(condition, tableAliasMap, defaultSchema);
            if (newCondition == null) {
                iteratorConditions.remove(); //AND CONDITION can be pruned
            } else {
                iteratorConditions.set(newCondition); //replace table name and column name
            }
        }
    }
}
 

private static List<RouteCalculateUnit> conditionsToRouteUnits(List<List<TableStat.Condition>> orConditionList) {
    List<RouteCalculateUnit> retList = new ArrayList<>();
    //find partition column in condition
    for (List<TableStat.Condition> andConditionList : orConditionList) {
        RouteCalculateUnit routeCalculateUnit = new RouteCalculateUnit();
        conditionToRouteUnit(routeCalculateUnit, andConditionList);
        retList.add(routeCalculateUnit);
    }
    if (LOGGER.isTraceEnabled()) {
        StringBuilder sb = new StringBuilder();
        int i = 0;
        for (RouteCalculateUnit routeUnit : retList) {
            i++;
            sb.append("{ RouteCalculateUnit ").append(i).append(" :");
            sb.append(routeUnit.toString());
            sb.append("}");
        }
        LOGGER.trace(sb.toString());
    }
    return retList;
}
 

private static void conditionToRouteUnit(RouteCalculateUnit routeCalculateUnit, List<TableStat.Condition> andConditionList) {
    for (TableStat.Condition condition : andConditionList) {
        List<Object> values = condition.getValues();
        String columnName = condition.getColumn().getName();
        String tableFullName = condition.getColumn().getTable();
        String operator = condition.getOperator();
        String[] tableInfo = tableFullName.split("\\.");
        Pair<String, String> table = new Pair<>(tableInfo[0], tableInfo[1]);
        //execute only between ,in and =
        if (operator.equalsIgnoreCase("between")) {
            RangeValue rv = new RangeValue(values.get(0), values.get(1));
            routeCalculateUnit.addShardingExpr(table, columnName, rv);
        } else if (operator.equals("=")) {
            routeCalculateUnit.addShardingExpr(table, columnName, values.get(0));
        } else if (operator.equalsIgnoreCase("in")) {
            routeCalculateUnit.addShardingExpr(table, columnName, values.toArray());
        } else if (operator.equalsIgnoreCase("IS")) {
            IsValue isValue = new IsValue(values.get(0));
            routeCalculateUnit.addShardingExpr(table, columnName, isValue);
        }
    }
}
 

public List<List<TableStat.Condition>> getOrConditions() {
    // 遍历
    orVisitor.accept(x);
    // 获取Or节点
    List<OrEntity> entitys = orVisitor.orEntity;
    // 设置条件
    setConditions(orVisitor.getConditions(), entitys);
    //
    orVisitor.reset();

    if (entitys != null && entitys.size() != 0){
        // 笛卡尔乘积
        return dikerMerge(entitys);
    }else {
        List<List<TableStat.Condition>> conditions = new ArrayList<List<TableStat.Condition>>(1);
        conditions.add(this.conditions);
        return conditions;
    }
}
 

private List<List<TableStat.Condition>> test(String sql){
    MySqlStatementParser parser = new MySqlStatementParser(sql);

    SQLStatement statemen = parser.parseStatement();

    List<Object> parameters = new ArrayList<Object>();

    parameters.add(10);

    OrVisitor visitor = new OrVisitor();
    OrVisitor.OrEntity orEntity = new OrVisitor.OrEntity(visitor, statemen);
    List<List<TableStat.Condition>> conditions = orEntity.getOrConditions();
    System.out.println();
    System.out.println(sql);
    System.out.println(conditions);
    System.out.println();
    return conditions;
}
 

private static void mergeOuterRelations(WhereUnit whereUnit) {
    if (whereUnit.getSubWhereUnit().size() > 0) {
        for (WhereUnit sub : whereUnit.getSubWhereUnit()) {
            mergeOuterRelations(sub);
            if (whereUnit.getOutRelationships().size() > 0) {
                for (List<TableStat.Condition> subConditionList : sub.getOrConditionList()) {
                    ConditionUtil.extendConditionsFromRelations(subConditionList, whereUnit.getOutRelationships());
                }
            }
        }
    }
}
 

private static void pruningConditions(List<WhereUnit> whereUnits, Map<String, String> tableAliasMap, String defaultSchema) {
    Iterator<WhereUnit> whereUnitIterator = whereUnits.listIterator();
    while (whereUnitIterator.hasNext()) {
        WhereUnit whereUnit = whereUnitIterator.next();
        String whereUnitContent = "empty";
        if (LOGGER.isTraceEnabled()) {
            whereUnitContent = whereUnit.toString();
        }
        final int subWhereSize = whereUnit.getSubWhereUnit().size();
        pruningConditions(whereUnit.getSubWhereUnit(), tableAliasMap, defaultSchema);
        final int subWhereSizeAfter = whereUnit.getSubWhereUnit().size();
        boolean orContainsEmpty = false;
        final int orSize = whereUnit.getOrConditionList().size();
        for (List<TableStat.Condition> conditions : whereUnit.getOrConditionList()) {
            pruningAndConditions(tableAliasMap, defaultSchema, conditions.listIterator());
            if (conditions.size() == 0) {
                orContainsEmpty = true;
                break;
            }
        }
        if (orContainsEmpty) {
            whereUnit.getOrConditionList().clear();
        }
        final int orSizeAfter = whereUnit.getOrConditionList().size();
        List<TableStat.Condition> outConditions = whereUnit.getOutAndConditions(); //outConditions item operator with AND
        ListIterator<TableStat.Condition> iteratorOutConditions = outConditions.listIterator();
        pruningAndConditions(tableAliasMap, defaultSchema, iteratorOutConditions);
        if (outConditions.size() == 0 && (subWhereSize != 0 && subWhereSizeAfter == 0) || (orSize != 0 && orSizeAfter == 0) || (subWhereSize == 0 && orSize == 0)) {
            if (LOGGER.isTraceEnabled()) {
                LOGGER.trace("whereUnit [" + whereUnitContent + "] will be pruned for contains useless or condition");
            }
            whereUnitIterator.remove();
        }
    }

}
 

private static TableStat.Condition genNewCondition(String tableName, String columnName, String operator, List<Object> values) {
    TableStat.Column column = new TableStat.Column(tableName, columnName);
    TableStat.Condition condition = new TableStat.Condition(column, operator);
    for (Object value : values) {
        condition.addValue(value);
    }
    return condition;
}
 

public void setConditions(List<TableStat.Condition> conditions0, List<OrEntity> entitys){
    // copy
    if (conditions0 != null && conditions0.size() != 0){
        this.conditions = new ArrayList<TableStat.Condition>(conditions0.size());
        for (TableStat.Condition con : conditions0){
            this.conditions.add(con);
        }
    }
    if (entitys != null){
        for (OrEntity entity : entitys){
            entity.conditions = this.conditions;
        }
    }
}
 

public List<List<TableStat.Condition>> dikerMerge(List<OrEntity> entities){
    List<List<TableStat.Condition>> result = entities.get(0).mergeConditions();
    if (entities.size() == 1){
        return result;
    }
    // 做笛卡尔乘
    for (int i = 1; i < entities.size(); i++) {
        List<List<TableStat.Condition>> merge =  entities.get(i).mergeConditions();
        result = dikerMerge(result, merge);
    }
    return result;
}
 

/**
 * 笛卡尔乘
 * @param c1
 * @param c2
 * @return
 */
public List<List<TableStat.Condition>> dikerMerge(List<List<TableStat.Condition>> c1, List<List<TableStat.Condition>> c2){
    if (c1 == null && c2 == null){
        return null;
    }
    if (c1 == null){
        return c2;
    }
    if (c2 == null){
        return c1;
    }
    List<List<TableStat.Condition>> result = new ArrayList<List<TableStat.Condition>>();
    for (Iterator<List<TableStat.Condition>> iteratorc1 = c1.iterator(); iteratorc1.hasNext(); ) {
        List<TableStat.Condition> inc1 = iteratorc1.next();
        if (inc1 == null){
            continue;
        }
        for (int i = 0; i < c2.size(); i++) {
            List<TableStat.Condition> inc2 = c2.get(i);
            if (inc2 == null){
                continue;
            }
            List<TableStat.Condition> newList = new ArrayList<TableStat.Condition>(inc1);
            newList.addAll(inc2);
            // or true
            result.add(newList);
        }
        iteratorc1.remove();
    }
    return result;
}
 

private static TableStat.Condition getUsefulCondition(TableStat.Condition condition, Map<String, String> tableAliasMap, String defaultSchema) {
    String tableFullName = condition.getColumn().getTable();
    if (DbleServer.getInstance().getSystemVariables().isLowerCaseTableNames()) {
        tableFullName = tableFullName.toLowerCase();
    }
    if (tableAliasMap != null && tableAliasMap.get(tableFullName) == null) {
        if (LOGGER.isTraceEnabled()) {
            LOGGER.trace("condition [" + condition + "] will be pruned for can't find table " + tableFullName);
        }
        //ignore subQuery's alias
        return null;
    }

    Pair<String, String> table = getTableInfo(tableAliasMap, tableFullName, defaultSchema);

    String schemaName = table.getKey();
    String tableName = table.getValue();
    tableFullName = schemaName + "." + tableName;
    if (SchemaUtil.MYSQL_SYS_SCHEMA.contains(schemaName.toUpperCase())) {
        if (LOGGER.isTraceEnabled()) {
            LOGGER.trace("condition [" + condition + "] will be pruned for schema name " + schemaName.toUpperCase());
        }
        return null;
    }
    TableConfig tableConfig = DbleServer.getInstance().getConfig().getSchemas().get(schemaName).getTables().get(tableName);
    if (tableConfig == null) {
        if (LOGGER.isTraceEnabled()) {
            LOGGER.trace("condition [" + condition + "] will be pruned for table is not config " + tableName);
        }
        return null;
    }

    String operator = condition.getOperator();
    //execute only between ,in and = is
    if (!operator.equalsIgnoreCase("between") && !operator.equals("=") && !operator.equalsIgnoreCase("in") && !operator.equalsIgnoreCase("IS")) {
        if (LOGGER.isTraceEnabled()) {
            LOGGER.trace("condition [" + condition + "] will be pruned for operator is not [between,=,in,IS]");
        }
        return null;
    }
    String partitionCol = tableConfig.getPartitionColumn();

    String columnName = StringUtil.removeBackQuote(condition.getColumn().getName().toUpperCase());
    if (columnName.equals(partitionCol)) {
        return genNewCondition(tableFullName, columnName, operator, condition.getValues());
    }

    String joinKey = tableConfig.getJoinKey();
    if (joinKey != null && columnName.equals(joinKey)) {
        return genNewCondition(tableFullName, columnName, operator, condition.getValues());
    }
    String catchKey = tableConfig.getCacheKey();
    if (catchKey != null && columnName.equals(catchKey)) {
        return genNewCondition(tableFullName, columnName, operator, condition.getValues());
    }
    if (LOGGER.isTraceEnabled()) {
        LOGGER.trace("condition [" + condition + "] will be pruned for columnName is not shardingcolumn/joinkey/cachekey");
    }
    return null;
}
 

/**
 * 前题：
 * 1. 只有一个表的Contidion
 * 2. Condition已经分割好
 * @param tableAliasMap
 * @param conditionList 这里的conditionList应该是已经用or切分好的计算单元
 * @return
 */
public static List<CalculateUnit> buildCalculateUnits(Map<String, String> tableAliasMap, List<List<TableStat.Condition>> conditionList) {
    List<CalculateUnit> retList = new ArrayList<CalculateUnit>();
    //遍历or
    for(List<TableStat.Condition> conditions : conditionList) {
        if (conditions == null){
            continue;
        }
        // 构建一个or
        CalculateUnit calculateUnit = new CalculateUnit();
        for(TableStat.Condition condition : conditions) {
            //遍历and
            List<Object> values = condition.getValues();
            if(values.size() == 0) {
                break;
            }
            if(checkConditionValues(values)) {
                String columnName = StringUtil.removeBackquote(condition.getColumn().getName());
                String tableName = StringUtil.removeBackquote(condition.getColumn().getTable());

                // 获取真实表名
                tableName = getRealTableName(tableAliasMap, tableName);

                if(tableAliasMap != null && tableAliasMap.get(tableName) == null) {
                    // 子查询的别名条件忽略掉,不参数路由计算，否则后面找不到表
                    // 虚拟表直接忽略 select x from (select xxxx) u;
                    // 忽略u
                    continue;
                }

                String operator = condition.getOperator();

                //只处理between ,in和=3中操作符
//                    if(operator.equals("between")) {
//                        RangeValue rv = new RangeValue(values.get(0), values.get(1), RangeValue.EE);
//                        CalculateUnit.addShardingExpr(tableName.toUpperCase(), columnName, rv);
//                    } else
                //|| operator.toLowerCase().equals("in")

                // between暂时不支持 需要枚举出between之间的值
                if(operator.equals("=")){
                    //只处理=号和in操作符,其他忽略
                    calculateUnit.addCondition(ConditionUnit.buildConditionUnit(tableName, columnName, values.toArray(), ConditionUnitOperator.EQUAL));
                }else if (operator.equalsIgnoreCase("in")){
                    // 对In的支持
                    calculateUnit.addCondition(ConditionUnit.buildConditionUnit(tableName, columnName, values.toArray(), ConditionUnitOperator.IN));
                }
            }
        }
        retList.add(calculateUnit);
    }
    return retList;
}
 

private List<List<TableStat.Condition>> mergeConditions(){

            List<List<TableStat.Condition>> orConditions = null;

            if (x instanceof SQLBinaryOpExpr){
                SQLExpr leftExpr = ((SQLBinaryOpExpr) x).getLeft();
                SQLExpr rightExpr = ((SQLBinaryOpExpr) x).getRight();


                List<List<TableStat.Condition>> left = null;
                List<List<TableStat.Condition>> right = null;

                if (!BooleanUtil.isConditionAlwaysFalse(leftExpr)){
                    left = new OrEntity(orVisitor, leftExpr).getOrConditions();
                }

                if (!BooleanUtil.isConditionAlwaysFalse(rightExpr)){
                    right = new OrEntity(orVisitor, (rightExpr)).getOrConditions();
                }

                orConditions = new ArrayList<List<TableStat.Condition>>();
                if (conditions != null && conditions.size() > 0){
                    // 做笛卡尔乘
                    ArrayList<List<TableStat.Condition>> conditionList = new ArrayList<List<TableStat.Condition>>();
                    conditionList.add(conditions);
                    if (left != null){
                        left = dikerMerge(left, conditionList);
                    }
                    if (right != null){
                        right = dikerMerge(right, conditionList);
                    }
                }
                if (left != null){
                    orConditions.addAll(left);
                }
                if (right != null){
                    orConditions.addAll(right);
                }
            }

            return orConditions;
        }