MsSql2008TriggerTemplate.java

package org.jumpmind.symmetric.db.mssql;

import org.jumpmind.db.model.Column;
import org.jumpmind.db.model.Table;
import org.jumpmind.symmetric.db.ISymmetricDialect;
import org.jumpmind.symmetric.io.data.DataEventType;
import org.jumpmind.symmetric.model.Channel;
import org.jumpmind.symmetric.model.Trigger;
import org.jumpmind.symmetric.model.TriggerHistory;
import org.jumpmind.util.FormatUtils;

public class MsSql2008TriggerTemplate extends MsSqlTriggerTemplate {
    public MsSql2008TriggerTemplate(ISymmetricDialect symmetricDialect) {
        super(symmetricDialect);
    }
    
    @Override
    protected String replaceTemplateVariables(DataEventType dml, Trigger trigger,
            TriggerHistory history, Channel channel, String tablePrefix, Table originalTable, Table table,
            String defaultCatalog, String defaultSchema, String ddl) {
        ddl = super.replaceTemplateVariables(dml, trigger, history, channel, tablePrefix, originalTable, table, defaultCatalog, defaultSchema, ddl);
        ddl = FormatUtils.replace("anyColumnChanged",
                buildColumnsAreNotEqualString(table, newTriggerValue, oldTriggerValue), ddl);
        return ddl;
    }
    
    private String buildColumnsAreNotEqualString(Table table, String table1Name, String table2Name){
        StringBuilder builder = new StringBuilder();
        
        for(Column column : table.getColumns()){
            if (builder.length() > 0) {
                builder.append(" or ");
            }

            if(isNotComparable(column)) {
                // Can't compare the value.
                // Let's use the UPDATE() function to see if it showed up in the SET list of the update statement
                builder.append(String.format("UPDATE(\"%1$s\")", column.getName()));
            } else {
                builder.append(String.format("((%1$s.\"%2$s\" IS NOT NULL AND %3$s.\"%2$s\" IS NOT NULL AND %1$s.\"%2$s\"<>%3$s.\"%2$s\") or "
                        + "(%1$s.\"%2$s\" IS NULL AND %3$s.\"%2$s\" IS NOT NULL) or "
                        + "(%1$s.\"%2$s\" IS NOT NULL AND %3$s.\"%2$s\" IS NULL))", table1Name, column.getName(), table2Name));
            }
        }
        if (builder.length() == 0) {
            builder.append("1=1");
        }
        return builder.toString();
    }
}