test
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0f335617b4
commit
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@ -1,7 +1,7 @@
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using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.Data.Common;
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using System.Diagnostics;
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using System.Linq;
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using System.Text;
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using ConsoleApp1.Model;
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@ -13,38 +13,14 @@ namespace ConsoleApp1.ORM
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public static void BulkInsert<TEntity>(IEnumerable<TEntity> entries)
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{
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var entityType = typeof(TEntity);
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var properties = entityType.GetProperties().Select(p => p.Name);
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BuildBulkInsertQuery(entityType.Name, properties, entries);
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var properties = entityType.GetProperties()
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.Select(p => p.Name)
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.ToArray();
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//ExecuteBulkInsertInBatches(entityType.Name, properties, entries);
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ExecuteBulkInsert(entityType.Name, properties, entries);
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}
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private static void GetParametersValues(string tableName, IEnumerable<string> propertyNames, IEnumerable entries)
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{
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static object GetPropertyValue(object o, string propertyName)
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{
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//Debug.Assert(propertyName != null, nameof(propertyName) + " != null");
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var type = o.GetType();
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var property = type.GetProperty(propertyName);
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//Debug.Assert(property != null, nameof(property) + " != null");
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var propertyValue = property?.GetValue(o);
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return propertyValue;
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}
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var fields = propertyNames as string[] ?? propertyNames.ToArray();
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var i = 0;
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foreach (var entry in entries)
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{
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++i;
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Console.WriteLine($"Entry number {i}");
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foreach (var propertyName in fields)
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{
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var propertyValue = GetPropertyValue(entry, propertyName);
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Console.WriteLine($"Property name={propertyName}, value={propertyValue}");
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}
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Console.WriteLine();
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}
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}
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private static void BuildBulkInsertQuery(string tableName,
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private static void ExecuteBulkInsertInBatches(string tableName,
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IEnumerable<string> propertyNames,
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IEnumerable entries,
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int maxBatchSize = 5)
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@ -108,66 +84,54 @@ namespace ConsoleApp1.ORM
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}
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}
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public static void BulkInsert1(IEnumerable<Person> persons)
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private static void ExecuteBulkInsert(string tableName,
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IReadOnlyCollection<string> columns,
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IEnumerable entries)
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{
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using var session = NHibernateHelper.OpenSession();
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var cmd = session.Connection.CreateCommand();
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var queryString = BuildBulkInsertQueryString(tableName, columns, entries);
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var query = session.CreateSQLQuery(queryString);
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var queryString = "INSERT INTO Person (Id, FirstName, LastName) VALUES\n";
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var sb = new StringBuilder();
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static object GetPropertyValue(object o, string propertyName) => o.GetType().GetProperty(propertyName)?.GetValue(o);
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var batchSize = 0;
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var p = 1; //the current paramter name (i.e. "@p1") we're going to use
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DbParameter CreateDbParameter(object value)
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var parameterIndex = 0;
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foreach (var entry in entries)
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{
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var pm = cmd.CreateParameter();
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pm.Value = value;
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return pm;
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}
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foreach (var person in persons)
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foreach (var column in columns)
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{
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//Build the names of the parameters
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var pId = $"@p{p}"; //the "Id" parameter name (i.e. "p1")
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var pFirstName = $"@p{p + 1}";
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var pLastName = $"@p{p + 2}";
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p += 3;
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var value = GetPropertyValue(entry, column);
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query.SetParameter(parameterIndex, value);
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parameterIndex++;
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}
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}
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//Build a single "(p1, p2)" row
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var row = $"({pId}, {pFirstName}, {pLastName})"; //a single values tuple
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query.ExecuteUpdate();
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}
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//Add the row to our running SQL batch
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if (batchSize > 0) sb.AppendLine(",");
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sb.Append(row);
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batchSize += 1;
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// Add the parameter values for this row
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cmd.Parameters.AddRange(new[] {
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CreateDbParameter(person.Id),
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CreateDbParameter(person.FirstName),
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CreateDbParameter(person.LastName)
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});
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if (batchSize >= 5)
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private static string BuildBulkInsertQueryString(string tableName,
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IReadOnlyCollection<string> columns,
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IEnumerable entries)
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{
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var queryStringComplete = queryString + sb;
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cmd.CommandText = queryStringComplete;
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cmd.ExecuteNonQuery();
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cmd.Parameters.Clear();
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sb.Clear();
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batchSize = 0;
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p = 1;
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}
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var queryString = $"INSERT INTO {tableName} ({string.Join(',', columns)}) VALUES";
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var sb = new StringBuilder(queryString).AppendLine();
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var e = entries.GetEnumerator();
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for (e.MoveNext();;)
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{
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sb.Append("(");
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for (var col = 0; col < columns.Count; col++)
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{
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sb.Append($"?");
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if (col < columns.Count - 1) sb.Append(",");
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}
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//handle the last few stragglers
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if (batchSize > 0)
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if (!e.MoveNext())
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{
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var queryStringComplete = queryString + sb;
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cmd.CommandText = queryStringComplete;
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cmd.ExecuteNonQuery();
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}
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sb.Append(");");
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break;
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}
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sb.AppendLine("),");
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}
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return sb.ToString();
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}
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}
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}
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@ -72,14 +72,16 @@ namespace ConsoleApp1.Repository
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[Test]
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public void TestBulkInsert()
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{
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static IEnumerable<Person> GeneratePersons(int num = 3)
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static Person[] GeneratePersons(int num = 3)
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{
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var ret = new Person[num];
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for (var ii = 0; ii < num; ii++) ret[ii] = new Person {Id = Guid.NewGuid(), FirstName = "bac", LastName = "fif"};
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return ret;
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}
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_personRepo.Save(GeneratePersons(10));
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var persons = GeneratePersons(10000);
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_personRepo.Save(persons);
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Assert.AreEqual(10000, _personRepo.RowCount());
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}
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[TearDown]
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