Package org.apache.torque.util
Class CountHelper
- java.lang.Object
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- org.apache.torque.util.CountHelper
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public class CountHelper extends Object
Counts entries matching a criteria.
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Constructor Summary
Constructors Constructor Description CountHelper()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description int
count(Criteria c)
The COUNT function returns the number of rows in a query.int
count(Criteria c, String columnName)
Returns the number of rows in a query.int
count(Criteria c, Connection conn)
The COUNT function returns the number of rows in a query.int
count(Criteria c, Connection conn, String columnName, TableMap tableMap)
Returns the number of rows in a query.int
count(Criteria c, Connection conn, Column column)
Returns the number of rows in a query.int
count(Criteria c, Column column)
Returns the number of rows in a query.int
count(TableMap tableMap)
Counts all rows in a table.int
count(TableMap tableMap, Connection conn)
Counts all rows in a table.
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Method Detail
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count
public int count(Criteria c) throws TorqueException
The COUNT function returns the number of rows in a query. Does not use a connection, hardcode the column to "*" and set the distinct qualifier to false. Only use this function if you have added additional constraints to the criteria, otherwise Torque does not know which table it should count the datasets in.- Parameters:
c
- Criteria to get the count for.- Returns:
- number of rows matching the query provided
- Throws:
TorqueException
- if the query could not be executed
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count
public int count(Criteria c, Connection conn) throws TorqueException
The COUNT function returns the number of rows in a query. Hard code the distinct parameter to false and set the column to "*". Only use this function if you have added additional constraints to the criteria, otherwise Torque does not know which table it should count the datasets in.- Parameters:
c
- Criteria to get the count for.conn
- Connection to use- Returns:
- number of rows matching the query provided
- Throws:
TorqueException
- if the query could not be executed
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count
public int count(Criteria c, String columnName) throws TorqueException
Returns the number of rows in a query.- Parameters:
c
- Criteria to get the count for.columnName
- Name of database Column which is counted. Preferably, use the primary key here.- Returns:
- number of rows matching the query provided
- Throws:
TorqueException
- if the query could not be executed
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count
public int count(Criteria c, Column column) throws TorqueException
Returns the number of rows in a query.- Parameters:
c
- Criteria to get the count for.column
- the database Column which is counted. Preferably, use the primary key here.- Returns:
- number of rows matching the query provided
- Throws:
TorqueException
- if the query could not be executed
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count
public int count(Criteria c, Connection conn, Column column) throws TorqueException
Returns the number of rows in a query.- Parameters:
c
- Criteria to get the count for.conn
- Connection to usecolumn
- The database Column which is counted. Preferably, use the primary key here.- Returns:
- number of rows matching the query provided
- Throws:
TorqueException
- if the query could not be executed
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count
public int count(TableMap tableMap) throws TorqueException
Counts all rows in a table.- Parameters:
tableMap
- the table map of the table to count rows in.- Returns:
- the number of rows in the table.
- Throws:
TorqueException
- if the query could not be executed
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count
public int count(TableMap tableMap, Connection conn) throws TorqueException
Counts all rows in a table.- Parameters:
tableMap
- the table map of the table to count rows in.conn
- the connection to use.- Returns:
- the number of rows in the table.
- Throws:
TorqueException
- if the query could not be executed
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count
public int count(Criteria c, Connection conn, String columnName, TableMap tableMap) throws TorqueException
Returns the number of rows in a query.- Parameters:
c
- Criteria to get the count for.conn
- Connection to usecolumnName
- Name of database Column which is counted. Preferably, use the primary key here.tableMap
- the table to count the columns in, or null to determine the table automatically from the criteria.- Returns:
- number of rows matching the query provided.
- Throws:
TorqueException
- if the query could not be executed.
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