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org.objectstyle.cayenne.access.trans
Class QueryAssemblerHelper  

java.lang.Object
  org.objectstyle.cayenne.access.trans.QueryAssemblerHelper

Direct Known Subclasses:

OrderingTranslator, QualifierTranslator

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public abstract class QueryAssemblerHelper

extends java.lang.Object

Translates parts of the query to SQL. Always works in the context of parent Translator.

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Field Summary
private static org.apache.log4j.Logger	logObj
protected  QueryAssembler	queryAssembler

 

Constructor Summary

QueryAssemblerHelper()

QueryAssemblerHelper(QueryAssembler queryAssembler)           Creates QueryAssemblerHelper.

 

Method Summary
protected  void	appendDbPath(java.lang.StringBuffer buf, org.objectstyle.cayenne.exp.Expression pathExp)
protected  void	appendLiteral(java.lang.StringBuffer buf, java.lang.Object val, org.objectstyle.cayenne.map.DbAttribute attr, org.objectstyle.cayenne.exp.Expression parentExpression)           Appends SQL code to the query buffer to handle val as a parameter to the PreparedStatement being built.
protected  void	appendLiteralDirect(java.lang.StringBuffer buf, java.lang.Object val, org.objectstyle.cayenne.map.DbAttribute attr, org.objectstyle.cayenne.exp.Expression parentExpression)           Appends SQL code to the query buffer to handle val as a parameter to the PreparedStatement being built.
protected  void	appendObjPath(java.lang.StringBuffer buf, org.objectstyle.cayenne.exp.Expression pathExp)           Processes parts of the OBJ_PATH expression.
abstract  java.lang.String	doTranslation()           Translates the part of parent translator's query that is supported by this PartTranslator.
org.objectstyle.cayenne.map.DbEntity	getDbEntity()
org.objectstyle.cayenne.map.ObjEntity	getObjEntity()
QueryAssembler	getQueryAssembler()           Returns parent QueryAssembler that uses this helper.
protected  org.objectstyle.cayenne.map.DbAttribute	paramsDbType(org.objectstyle.cayenne.exp.Expression e)           Returns database type of expression parameters or null if it can not be determined.
protected  void	processColumn(java.lang.StringBuffer buf, org.objectstyle.cayenne.map.DbAttribute dbAttr)
protected  void	processColumn(java.lang.StringBuffer buf, org.objectstyle.cayenne.map.DbAttribute dbAttr, org.objectstyle.cayenne.map.DbRelationship rel)
protected  void	processColumn(java.lang.StringBuffer buf, org.objectstyle.cayenne.exp.Expression nameExp)           Appends column name of a column in a root entity.
protected  void	processRelTermination(java.lang.StringBuffer buf, org.objectstyle.cayenne.map.DbRelationship rel)           Handles case when a DB_NAME expression ends with relationship.
protected  void	processRelTermination(java.lang.StringBuffer buf, org.objectstyle.cayenne.map.ObjRelationship rel)           Processes case when an OBJ_PATH expression ends with relationship.
void	setQueryAssembler(QueryAssembler queryAssembler)

 

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

 

Field Detail

logObj

private static org.apache.log4j.Logger logObj

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queryAssembler

protected QueryAssembler queryAssembler

Constructor Detail

QueryAssemblerHelper

public QueryAssemblerHelper()

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QueryAssemblerHelper

public QueryAssemblerHelper(QueryAssembler queryAssembler)

Creates QueryAssemblerHelper. Sets queryAssembler property.

Method Detail

getQueryAssembler

public QueryAssembler getQueryAssembler()

Returns parent QueryAssembler that uses this helper.

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setQueryAssembler

public void setQueryAssembler(QueryAssembler queryAssembler)

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doTranslation

public abstract java.lang.String doTranslation()

Translates the part of parent translator's query that is supported by this PartTranslator. For example, QualifierTranslator will process qualifier expression, OrderingTranslator - ordering of the query. In the process of translation parent translator is notified of any join tables added (so that it can update its "FROM" clause). Also parent translator is consulted about table aliases to use when translating columns.

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getObjEntity

public org.objectstyle.cayenne.map.ObjEntity getObjEntity()

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getDbEntity

public org.objectstyle.cayenne.map.DbEntity getDbEntity()

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appendObjPath

protected void appendObjPath(java.lang.StringBuffer buf,
                             org.objectstyle.cayenne.exp.Expression pathExp)

Processes parts of the OBJ_PATH expression.

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appendDbPath

protected void appendDbPath(java.lang.StringBuffer buf,
                            org.objectstyle.cayenne.exp.Expression pathExp)

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processColumn

protected void processColumn(java.lang.StringBuffer buf,
                             org.objectstyle.cayenne.exp.Expression nameExp)

Appends column name of a column in a root entity.

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processColumn

protected void processColumn(java.lang.StringBuffer buf,
                             org.objectstyle.cayenne.map.DbAttribute dbAttr,
                             org.objectstyle.cayenne.map.DbRelationship rel)

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processColumn

protected void processColumn(java.lang.StringBuffer buf,
                             org.objectstyle.cayenne.map.DbAttribute dbAttr)

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appendLiteral

protected void appendLiteral(java.lang.StringBuffer buf,
                             java.lang.Object val,
                             org.objectstyle.cayenne.map.DbAttribute attr,
                             org.objectstyle.cayenne.exp.Expression parentExpression)

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.

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appendLiteralDirect

protected void appendLiteralDirect(java.lang.StringBuffer buf,
                                   java.lang.Object val,
                                   org.objectstyle.cayenne.map.DbAttribute attr,
                                   org.objectstyle.cayenne.exp.Expression parentExpression)

Appends SQL code to the query buffer to handle val as a parameter to the PreparedStatement being built. Adds val into QueryAssembler parameter list.

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paramsDbType

protected org.objectstyle.cayenne.map.DbAttribute paramsDbType(org.objectstyle.cayenne.exp.Expression e)

Returns database type of expression parameters or null if it can not be determined.

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processRelTermination

protected void processRelTermination(java.lang.StringBuffer buf,
                                     org.objectstyle.cayenne.map.ObjRelationship rel)

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 expresion for the source foreign key is added.

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processRelTermination

protected void processRelTermination(java.lang.StringBuffer buf,
                                     org.objectstyle.cayenne.map.DbRelationship rel)

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 expresion for the source foreign key is added.

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Overview  Package   Class  Use  Deprecated  Index
Home >> All >> org >> objectstyle >> cayenne >> access >> [ trans overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

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