* subclasses can override this for custom behaviour.*/
protected String getSelectQuery() {
StringBuilder query = new StringBuilder();
DataDrivenDBInputFormat.DataDrivenDBInputSplit dataSplit =
(DataDrivenDBInputFormat.DataDrivenDBInputSplit) getSplit();
DBConfiguration dbConf = getDBConf();
String [] fieldNames = getFieldNames();
String tableName = getTableName();
String conditions = getConditions();
// Build the WHERE clauses associated with the data split first.
// We need them in both branches of this function.
StringBuilder conditionClauses = new StringBuilder();
conditionClauses.append("( ").append(dataSplit.getLowerClause());
conditionClauses.append(" ) AND ( ").append(dataSplit.getUpperClause());
conditionClauses.append(" )");
if (dbConf.getInputQuery() == null) {
// We need to generate the entire query.
query.append("SELECT ");
for (int i = 0; i < fieldNames.length; i++) {
query.append(fieldNames[i]);
if (i != fieldNames.length -1) {
query.append(", ");
}
}
query.append(" FROM ").append(tableName);
if (!dbProductName.startsWith("ORACLE")) {
// Seems to be necessary for hsqldb? Oracle explicitly does *not*
// use this clause.
query.append(" AS ").append(tableName);
}
query.append(" WHERE ");
if (conditions != null && conditions.length() > 0) {
// Put the user's conditions first.
query.append("( ").append(conditions).append(" ) AND ");
}
// Now append the conditions associated with our split.
query.append(conditionClauses.toString());
} else {
// User provided the query. We replace the special token with
// our WHERE clause.
String inputQuery = dbConf.getInputQuery();
if (inputQuery.indexOf(DataDrivenDBInputFormat.SUBSTITUTE_TOKEN) == -1) {
LOG.error("Could not find the clause substitution token "
+ DataDrivenDBInputFormat.SUBSTITUTE_TOKEN + " in the query: ["
+ inputQuery + "]. Parallel splits may not work correctly.");
}