Class QueryAssemblerHelper

    • Constructor Detail

      • QueryAssemblerHelper

        public QueryAssemblerHelper​(QueryAssembler queryAssembler)
        Creates QueryAssemblerHelper initializing with parent QueryAssembler and output buffer object.
    • Method Detail

      • getObjEntity

        public ObjEntity getObjEntity()
      • getDbEntity

        public DbEntity getDbEntity()
      • doAppendPart

        protected abstract void doAppendPart()
        Since:
        3.0
      • appendLikeEscapeCharacter

        protected void appendLikeEscapeCharacter​(PatternMatchNode patternMatchNode)
                                          throws IOException

        Outputs the standard JDBC (database agnostic) expression for supplying the escape character to the database server when supplying a LIKE clause. This has been factored-out because some database adaptors handle LIKE differently and they need access to this common method in order not to repeat this code.

        If there is no escape character defined then this method will not output anything. An escape character of 0 will mean no escape character.

        Throws:
        IOException
        Since:
        3.1
      • appendObjPath

        protected void appendObjPath​(Expression pathExp)
        Processes parts of the OBJ_PATH expression.
      • appendDbPath

        protected void appendDbPath​(Expression pathExp)
      • processColumn

        protected void processColumn​(DbAttribute dbAttr)
      • processColumnWithQuoteSqlIdentifiers

        protected void processColumnWithQuoteSqlIdentifiers​(DbAttribute dbAttr,
                                                            Expression pathExp)
      • appendLiteral

        protected void appendLiteral​(Object val,
                                     DbAttribute attr,
                                     Expression parentExpression)
                              throws IOException
        Appends SQL code to the query buffer to handle val as a parameter to the PreparedStatement being built. Adds val into QueryAssembler parameter list.

        If val is null, "NULL" is appended to the query.

        If val is a DataObject, its primary key value is used as a parameter. Only objects with a single column primary key can be used.

        Parameters:
        val - object that should be appended as a literal to the query. Must be of one of "standard JDBC" types, null or a DataObject.
        attr - DbAttribute that has information on what type of parameter is being appended.
        Throws:
        IOException
      • appendLiteralDirect

        protected void appendLiteralDirect​(Object val,
                                           DbAttribute attr,
                                           Expression parentExpression)
                                    throws IOException
        Appends SQL code to the query buffer to handle val as a parameter to the PreparedStatement being built. Adds val into QueryAssembler parameter list.
        Throws:
        IOException
      • paramsDbType

        protected DbAttribute paramsDbType​(Expression e)
        Returns database type of expression parameters or null if it can not be determined.
      • processRelTermination

        protected void processRelTermination​(ObjRelationship rel,
                                             JoinType joinType,
                                             String joinSplitAlias)
        Processes case when an OBJ_PATH expression ends with relationship. If this is a "to many" relationship, a join is added and a column expression for the target entity primary key. If this is a "to one" relationship, column expression for the source foreign key is added.
        Since:
        3.0
      • processRelTermination

        protected void processRelTermination​(DbRelationship rel,
                                             JoinType joinType,
                                             String joinSplitAlias)
        Handles case when a DB_NAME expression ends with relationship. If this is a "to many" relationship, a join is added and a column expression for the target entity primary key. If this is a "to one" relationship, column expression for the source foreign key is added.
        Since:
        3.0
      • setForceJoinForRelations

        protected void setForceJoinForRelations​(boolean forceJoinForRelations)
        Force joining tables for all relations, not only for toMany
        Since:
        4.0