private[this] object BatchSqlApp extends FlinkTable scala转换为java

private static class BatchSqlApp implements FlinkTable {

@Override
public void convertToSqlTable(TableEnvironment tableEnv) {
// Create a BatchTableEnvironment
BatchTableEnvironment batchTableEnv = TableEnvironment.getTableEnvironment(env);

// Register a table from a CSV file
CsvTableSource ordersCsv = new CsvTableSource("path/to/orders.csv",
new String[]{"order_id", "customer_id", "order_date", "total_amount"},
new TypeInformation[]{
Types.INT(), Types.INT(), Types.SQL_DATE(), Types.DOUBLE()
});
batchTableEnv.registerTableSource("orders", ordersCsv);

// Register a table from a JDBC data source
JdbcTableSource customersDb = JdbcTableSource.builder()
.setDrivername("org.postgresql.Driver")
.setDBUrl("jdbc:postgresql://localhost:5432/customers")
.setUsername("user")
.setPassword("password")
.setQuery("SELECT customer_id, first_name, last_name, address FROM customers")
.build();
batchTableEnv.registerTableSource("customers", customersDb);

// Register a user-defined function
ScalarFunction discount = new ScalarFunction() {
public double eval(double price) {
if (price > 100) {
return price * 0.9;
} else {
return price;
}
}
};
batchTableEnv.registerFunction("discount", discount);

// Run a SQL query on the registered tables
String query = "SELECT c.first_name, c.last_name, SUM(o.total_amount) as total_spent "
+ "FROM customers c JOIN orders o ON c.customer_id = o.customer_id "
+ "WHERE o.order_date BETWEEN '2019-01-01' AND '2019-12-31' "
+ "GROUP BY c.first_name, c.last_name "
+ "HAVING total_spent > 1000";
Table resultTable = batchTableEnv.sqlQuery(query);

// Print the result table
resultTable.printSchema();
resultTable.print();
}
}