package liquibase.sqlgenerator.core;

 import liquibase.database.Database;

 import liquibase.database.core.DB2Database;

 import liquibase.statement.core.InsertOrUpdateStatement;

 public class InsertOrUpdateGeneratorDB2 extends InsertOrUpdateGenerator {

     @Override

     protected String getElse(Database database) {

         return "\tELSEIF v_reccount = 1 THEN\n";

     }

     @Override

     protected String getRecordCheck(InsertOrUpdateStatement insertOrUpdateStatement, Database database,

             String whereClause) {

         StringBuffer recordCheckSql = new StringBuffer();

         recordCheckSql.append("BEGIN ATOMIC\n");

         recordCheckSql.append("\tDECLARE v_reccount INTEGER;\n");

         recordCheckSql.append("\tSET v_reccount = (SELECT COUNT(*) FROM "

                 + database.escapeTableName(insertOrUpdateStatement.getSchemaName(),

                         insertOrUpdateStatement.getTableName()) + " WHERE ");

         recordCheckSql.append(whereClause);

         recordCheckSql.append(");\n");

         recordCheckSql.append("\tIF v_reccount = 0 THEN\n");

         return recordCheckSql.toString();

     }

     @Override

     public boolean supports(InsertOrUpdateStatement statement, Database database) {

         return database instanceof DB2Database;

     }

     @Override

     protected String getPostUpdateStatements() {

         StringBuffer endStatements = new StringBuffer();

         endStatements.append("END IF;\n");

         endStatements.append("END\n");

         return endStatements.toString();

     }

 }