com.github.drinkjava2.jdialects
Class DialectFunctionUtils

java.lang.Object
  com.github.drinkjava2.jdialects.DialectFunctionUtils

public class DialectFunctionUtils
extends Object

Dialect function Utils, detail see render method

Since:

1.0.2

Author:

Yong Zhu

Constructor Summary

DialectFunctionUtils()

Method Summary

protected static String

render(Dialect d, String functionName, String... args) The render method translate function template to real SQL piece

Methods inherited from class java.lang.Object

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

Constructor Detail

DialectFunctionUtils

public DialectFunctionUtils()

Method Detail

render

protected static String render(Dialect d,
                               String functionName,
                               String... args)

The render method translate function template to real SQL piece

 Template can be:
 "*": standard SQL function, identical to abc($Params)
 "abc($Params)": template with special parameter format:  
                                        "$P1, $P2, $P3, $P4, $P5, $P6..."="$Params"
                                        "$P1,$P2,$P3,$P4,$P5,$P6..."="$Compact_Params"
                                        "$P1||$P2||$P3||$P4||$P5||$P6..."="$Lined_Params"
                                        "$P1+$P2+$P3+$P4+$P5+$P6..."="$Add_Params");
                                        "$P1 in $P2 in $P3 in $P4 in $P5 in $P6..."="$IN_Params"
                                "$P1%pattern$P2%pattern$P3%pattern$P4%pattern$P5%pattern$P6..."="$Pattern_Params"
                                        "11%startswith$P2%startswith$P3%startswith$P4%startswith$P5%startswith$P6..."= "$Startswith_Params");
                                         "nvl($P1, nvl($P2, nvl($P3, nvl($P4, nvl($P5, $P6...)))))"="$NVL_Params");
 
 "0=abc()": function do not support parameter
 "1=abc($P1)": function only support 1 parameter
 "2=abc($P1,$P2)": function only support 2 parameters
 "0=abc()|1=abc($P1)|3=abc($P1,$P2,$P3)": function support 0 or 1 or 3 parameters
 
 

Parameters:

functionName - function name

args - function parameters

Returns:

A SQL function piece