Class SQLFunctionCoalesce
- java.lang.Object
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- com.arcadedb.query.sql.function.SQLFunctionAbstract
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- com.arcadedb.query.sql.function.misc.SQLFunctionCoalesce
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- All Implemented Interfaces:
SQLFunction
public class SQLFunctionCoalesce extends SQLFunctionAbstract
Returns the first field/value not null parameter. if no field/value is not null, returns null.
Syntax:coalesce(<field|value>[,<field|value>]*)
Examples:SELECT coalesce('a', 'b') FROM ... -> 'a' SELECT coalesce(null, 'b') FROM ... -> 'b' SELECT coalesce(null, null, 'c') FROM ... -> 'c' SELECT coalesce(null, null) FROM ... -> null
- Author:
- Claudio Tesoriero
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Field Summary
Fields Modifier and Type Field Description static String
NAME
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Fields inherited from class com.arcadedb.query.sql.function.SQLFunctionAbstract
name
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Constructor Summary
Constructors Constructor Description SQLFunctionCoalesce()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description Object
execute(Object iThis, Identifiable iCurrentRecord, Object iCurrentResult, Object[] iParams, CommandContext iContext)
Process a record.String
getSyntax()
Returns a convenient SQL String representation of the function.-
Methods inherited from class com.arcadedb.query.sql.function.SQLFunctionAbstract
aggregateResults, config, getName, getResult, toString
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Field Detail
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NAME
public static final String NAME
- See Also:
- Constant Field Values
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Method Detail
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execute
public Object execute(Object iThis, Identifiable iCurrentRecord, Object iCurrentResult, Object[] iParams, CommandContext iContext)
Description copied from interface:SQLFunction
Process a record.iCurrentRecord
- : current recordiCurrentResult
- TODOiParams
- : function parameters, number is ensured to be within minParams and maxParams.iContext
- : object calling this function- Returns:
- function result, can be null. Special cases : can be null if function aggregate results, can be null if function filter results : this mean result is excluded
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getSyntax
public String getSyntax()
Description copied from interface:SQLFunction
Returns a convenient SQL String representation of the function.Example :
myFunction( param1, param2, [optionalParam3])
This text will be used in exception messages.
- Returns:
- String , never null.
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