今天有个朋友测试 sqlite，然后得出的结论是： sqlite 效率太低，批量插入1000条记录，居然耗时 2 分钟！
下面是他发给我的测试代码。我晕~~~~~~
using System.Data;
using System.Data.Common;
using System.Data.sqlite;
// 创建数据库文件
File.Delete("test1.db3");
sqliteConnection.CreateFile("test1.db3");
DbProviderFactory factory = sqliteFactory.Instance;
using (DbConnection conn = factory.CreateConnection())
{
// 连接数据库
conn.ConnectionString = "Data Source=test1.db3";
conn.Open();
// 创建数据表
string sql = "create table [test1] ([id] INTEGER PRIMARY KEY,[s] TEXT COLLATE NOCASE)";
DbCommand cmd = conn.CreateCommand();
cmd.Connection = conn;
cmd.CommandText = sql;
cmd.ExecuteNonQuery();
// 添加参数
cmd.Parameters.Add(cmd.CreateParameter());
// 开始计时
Stopwatch watch = new Stopwatch();
watch.Start();
// 连续插入1000条记录
for (int i = 0; i < 1000; i++)
{
cmd.CommandText = "insert into [test1] ([s]) values (?)";
cmd.Parameters[0].Value = i.ToString();
cmd.ExecuteNonQuery();
}
// 停止计时
watch.Stop();
Console.WriteLine(watch.Elapsed);
}
using System.Data.Common;
using System.Data.sqlite;
// 创建数据库文件
File.Delete("test1.db3");
sqliteConnection.CreateFile("test1.db3");
DbProviderFactory factory = sqliteFactory.Instance;
using (DbConnection conn = factory.CreateConnection())
{
// 连接数据库
conn.ConnectionString = "Data Source=test1.db3";
conn.Open();
// 创建数据表
string sql = "create table [test1] ([id] INTEGER PRIMARY KEY,[s] TEXT COLLATE NOCASE)";
DbCommand cmd = conn.CreateCommand();
cmd.Connection = conn;
cmd.CommandText = sql;
cmd.ExecuteNonQuery();
// 添加参数
cmd.Parameters.Add(cmd.CreateParameter());
// 开始计时
Stopwatch watch = new Stopwatch();
watch.Start();
// 连续插入1000条记录
for (int i = 0; i < 1000; i++)
{
cmd.CommandText = "insert into [test1] ([s]) values (?)";
cmd.Parameters[0].Value = i.ToString();
cmd.ExecuteNonQuery();
}
// 停止计时
watch.Stop();
Console.WriteLine(watch.Elapsed);
}
哎~~~~ 一个常识性的错误，我加几行代码 (新增代码标记 "// <-------------------")。
DbCommand cmd = conn.CreateCommand();
cmd.Connection = conn;
cmd.CommandText = sql;
cmd.ExecuteNonQuery();
// 添加参数
cmd.Parameters.Add(cmd.CreateParameter());
// 开始计时
Stopwatch watch = new Stopwatch();
watch.Start();
DbTransaction trans = conn.BeginTransaction(); // <-------------------
try
{
// 连续插入1000条记录
for (int i = 0; i < 1000; i++)
{
cmd.CommandText = "insert into [test1] ([s]) values (?)";
cmd.Parameters[0].Value = i.ToString();
cmd.ExecuteNonQuery();
}
trans.Commit(); // <-------------------
}
catch
{
trans.Rollback(); // <-------------------
throw; // <-------------------
}
// 停止计时
watch.Stop();
Console.WriteLine(watch.Elapsed);
}
