add a getTableNames() and getTableMetadata() example

modules/clients/build.gradle

@@ -157,3 +157,15 @@ tasks.register('runKeepAlive', JavaExec) {
     systemProperty 'org.slf4j.simpleLogger.showShortLogName', 'true'
     systemProperty 'org.slf4j.simpleLogger.levelInBrackets', 'true'
 }
+
+tasks.register('runTables', JavaExec) {
+    classpath = sourceSets.main.runtimeClasspath
+    mainClass = 'com.tsurugidb.tsubakuro.examples.tables.Main'
+
+    systemProperty 'tsurugi.dbname', findProperty('tsurugi.dbname') ?: 'ipc:tsurugi'
+
+    systemProperty 'org.slf4j.simpleLogger.defaultLogLevel', findProperty('loglevel') ?: 'info'
+    systemProperty 'org.slf4j.simpleLogger.showThreadName', 'false'
+    systemProperty 'org.slf4j.simpleLogger.showShortLogName', 'true'
+    systemProperty 'org.slf4j.simpleLogger.levelInBrackets', 'true'
+}

modules/clients/src/main/java/com/tsurugidb/tsubakuro/examples/tables/Main.java

@@ -0,0 +1,44 @@
+package com.tsurugidb.tsubakuro.examples.tables;
+
+import java.io.IOException;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
+
+import com.tsurugidb.tsubakuro.exception.ServerException;
+import com.tsurugidb.tsubakuro.channel.common.connection.UsernamePasswordCredential;
+import com.tsurugidb.tsubakuro.common.Session;
+import com.tsurugidb.tsubakuro.common.SessionBuilder;
+import com.tsurugidb.tsubakuro.sql.SqlClient;
+
+public final class Main {
+    private Main(String[] args) {
+    }
+
+    // set dbname as follows
+    // -Ptsurugi.dbname=ipc:tsurugi or
+    // -Ptsurugi.dbname=tcp://localhost:12345
+    // when run this example by `./gradlew run` command
+    private static String url = System.getProperty("tsurugi.dbname");
+
+    public static void main(String[] args) {
+        try (
+             Session session = SessionBuilder.connect(url)
+             .withCredential(new UsernamePasswordCredential("user", "pass"))
+             .create(10, TimeUnit.SECONDS);
+             SqlClient sqlClient = SqlClient.attach(session)) {
+
+            var tableList = sqlClient.listTables().get();
+            for (var t : tableList.getTableNames()) {
+                var metadata = sqlClient.getTableMetadata(t).get();
+                System.out.println("---- table name = " + t + " ----");
+                for (var c : metadata.getColumns()) {
+                    System.out.println("column = " + c);
+                    System.out.println();
+                }                    
+            }
+
+        } catch (Exception e) {
+            System.err.println(e);
+        }
+    }
+}