Apache Solr Reference Guide Covering Apache Solr 6.0

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Sending Queries
The SQL Interface provides a basic JDBC driver and an HTTP interface to perform queries.
JDBC Driver
The JDBC Driver ships with SolrJ. Below is sample code for creating a connection and executing a query with
the JDBC driver:
Connection con = null;
try {
con = DriverManager.getConnection("jdbc:solr://" + zkHost +
"?collection=collection1&aggregationMode=map_reduce&numWorkers=2");
stmt = con.createStatement();
rs = stmt.executeQuery("SELECT a_s, sum(a_f) as sum FROM collection1 GROUP BY a_s
ORDER BY sum desc");
while(rs.next()) {
String a_s = rs.getString("a_s");
double s = rs.getDouble("sum");
}
} finally {
rs.close();
stmt.close();
con.close();
}
The connection URL must contain the zkHost and the collection parameters. The collection must be a valid
SolrCloud collection at the specified ZooKeeper host. The collection must also be configured with the /sql handl
er. The aggregationMode and numWorkers parameters are optional.
HTTP Interface
Solr accepts parallel SQL queries through the /sql handler.
Below is a sample curl command performing a SQL aggregate query in facet mode:
curl --data-urlencode 'stmt=SELECT to, count(*) FROM collection4 GROUP BY to ORDER
BY count(*) desc LIMIT 10'
http://localhost:8983/solr/collection4/sql?aggregationMode=facet
Below is sample result set:
Apache Solr Reference Guide 6.0
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