65 lines
2.4 KiB
C#
65 lines
2.4 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Linq;
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using Neo4j.Driver;
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public class Transactions {
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public static void Main(string[] args) {
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using (var driver = GraphDatabase.Driver(
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"bolt://localhost:7687", AuthTokens.None,
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(builder) => builder.WithEncryptionLevel(EncryptionLevel.None))) {
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ClearDatabase(driver);
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// Wrong query.
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try {
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using (var session = driver.Session()) using (var tx = session.BeginTransaction()) {
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CreatePerson(tx, "mirko");
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// Incorrectly start CREATE
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tx.Run("CREATE (").Consume();
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CreatePerson(tx, "slavko");
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tx.Commit();
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}
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} catch (ClientException) {
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Console.WriteLine("Rolled back transaction");
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}
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Trace.Assert(CountNodes(driver) == 0, "Expected transaction was rolled back.");
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// Correct query.
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using (var session = driver.Session()) using (var tx = session.BeginTransaction()) {
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CreatePerson(tx, "mirka");
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CreatePerson(tx, "slavka");
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tx.Commit();
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}
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Trace.Assert(CountNodes(driver) == 2, "Expected 2 created nodes.");
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ClearDatabase(driver);
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using (var session = driver.Session()) {
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// Create a lot of nodes so that the next read takes a long time.
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session.Run("UNWIND range(1, 100000) AS i CREATE ()").Consume();
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try {
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Console.WriteLine("Running a long read...");
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session.Run("MATCH (a), (b), (c), (d), (e), (f) RETURN COUNT(*) AS cnt").Consume();
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} catch (TransientException) {
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Console.WriteLine("Transaction timed out");
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}
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}
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}
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Console.WriteLine("All ok!");
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}
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private static void CreatePerson(ITransaction tx, string name) {
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var parameters = new Dictionary<string, Object> { { "name", name } };
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var result = tx.Run("CREATE (person:Person {name: $name}) RETURN person", parameters);
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Console.WriteLine("Created: " + ((INode)result.First()["person"])["name"]);
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}
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private static void ClearDatabase(IDriver driver) {
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using (var session = driver.Session()) session.Run("MATCH (n) DETACH DELETE n").Consume();
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}
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private static int CountNodes(IDriver driver) {
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using (var session = driver.Session()) {
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var result = session.Run("MATCH (n) RETURN COUNT(*) AS cnt");
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return Convert.ToInt32(result.First()["cnt"]);
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}
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}
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}
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