ClickHouse/docker/test/integration/postgresql_java_client/Test.java

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Java
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2020-05-30 17:04:02 +00:00
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;
class JavaConnectorTest {
private static final String CREATE_TABLE_SQL = "CREATE TABLE IF NOT EXISTS default.test1 (`age` Int32, `name` String, `int_nullable` Nullable(Int32)) Engine = Memory";
private static final String INSERT_SQL = "INSERT INTO default.test1(`age`, `name`) VALUES(33, 'jdbc'),(44, 'ck')";
private static final String SELECT_SQL = "SELECT * FROM default.test1";
private static final String SELECT_NUMBER_SQL = "SELECT * FROM system.numbers LIMIT 13";
private static final String DROP_TABLE_SQL = "DROP TABLE default.test1";
public static void main(String[] args) {
int i = 0;
String host = "127.0.0.1";
String port = "5432";
String user = "default";
String password = "";
String database = "default";
while (i < args.length) {
switch (args[i]) {
case "--host":
host = args[++i];
break;
case "--port":
port = args[++i];
break;
case "--user":
user = args[++i];
break;
case "--password":
password = args[++i];
break;
case "--database":
database = args[++i];
break;
default:
i++;
break;
}
}
String jdbcUrl = String.format("jdbc:postgresql://%s:%s/%s", host, port, database);
Connection conn = null;
Statement stmt = null;
Properties props = new Properties();
props.setProperty("user", user);
props.setProperty("password", password);
props.setProperty("preferQueryMode", "simple");
props.setProperty("sslmode", "disable");
try {
conn = DriverManager.getConnection(jdbcUrl, props);
stmt = conn.createStatement();
stmt.executeUpdate(CREATE_TABLE_SQL);
stmt.executeUpdate(INSERT_SQL);
ResultSet rs = stmt.executeQuery(SELECT_SQL);
while (rs.next()) {
System.out.print(rs.getString("age"));
System.out.print(rs.getString("name"));
System.out.print(rs.getString("int_nullable"));
System.out.println();
}
stmt.executeUpdate(DROP_TABLE_SQL);
rs = stmt.executeQuery(SELECT_NUMBER_SQL);
while (rs.next()) {
System.out.print(rs.getString(1));
System.out.println();
}
stmt.close();
conn.close();
} catch (SQLException e) {
e.printStackTrace();
System.exit(1);
}
}
}