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using Apewer.Internals;
#if NETFRAMEWORK
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.OleDb;
using System.IO;
using System.IO.Compression;
using System.Reflection;
using System.Text;
using static Apewer.Source.SourceUtility;
#endif
namespace Apewer.Source
{
/// <summary>连接 Access 数据库的客户端。</summary>
public abstract partial class Access
{
/// <summary>尝试解析 Access 文件的密码。</summary>
/// <remarks>当操作系统启用随机化内存分配时,此方法可能会产生异常。</remarks>
public static string[] ParsePassword(string path) => AccessHelper.GetPassword(path);
/// <summary>数据库文件路径。</summary>
public virtual string Path { get; protected set; }
}
#if NETFRAMEWORK
public abstract partial class Access : DbClient
{
#region 连接
OleDbConnection _conn = null;
string _connstr = null;
/// <summary>构造函数。</summary>
internal Access(string connectrionString, Timeout timeout = null) : base(timeout)
{
_connstr = connectrionString;
}
/// <summary>使用连接字符串创建数据库连接实例。</summary>
/// <exception cref="ArgumentNullException"></exception>
/// <exception cref="ArgumentException"></exception>
public Access(IDbConnection connection, Timeout timeout = null) : base(timeout)
{
if (connection == null) throw new ArgumentNullException(nameof(connection), "指定的连接无效。");
var conn = connection as OleDbConnection;
if (conn == null) throw new ArgumentException(nameof(connection), "指定的连接不是支持的类型。");
_conn = conn;
_connstr = conn.ConnectionString;
}
#endregion
#region public
/// <summary></summary>
public override string[] ColumnNames(string tableName)
{
if (_conn == null) _conn = new OleDbConnection(_connstr);
// OleDbConnection.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, new object[] { null, null, null, "TABLE" });
var table = _conn.GetOleDbSchemaTable(OleDbSchemaGuid.Columns, new object[] { null, null, tableName.ToString(), null });
using (var query = new Query(table))
{
var names = new ArrayBuilder<string>();
for (var i = 0; i < query.Rows; i++)
{
names.Add(query.Text(i, "COLUMN_NAME"));
}
return names.Export();
}
}
/// <summary></summary>
public override string[] StoreNames() => throw new InvalidOperationException();
/// <summary></summary>
public override string[] TableNames()
{
// QueryStrings("select name from msysobjects where type=1 and flags = 0");
Connect();
var schema = _conn.GetSchema("Tables");
using (var query = new Query(schema))
{
var json = query.ToJson();
var names = new List<string>();
for (var i = 0; i < query.Rows; i++)
{
var type = query.Text(i, "TABLE_TYPE");
var name = query.Text(i, "TABLE_NAME");
switch (type)
{
case "ACCESS TABLE":
case "SYSTEM TABLE":
break;
case "TABLE":
names.Add(name);
break;
}
}
names.Sort();
return names.ToArray();
}
}
/// <summary></summary>
public override string Insert(object record, string table = null, bool adjust = true)
{
if (record == null) return "参数无效。";
if (adjust) FixProperties(record);
var structure = TableStructure.Parse(record.GetType());
if (structure == null) return "无法解析记录模型。";
if (string.IsNullOrEmpty(table)) table = structure.TableName;
if (string.IsNullOrEmpty(table)) return "表名称无效。";
// 排除字段。
var excluded = new List<string>();
foreach (var ca in structure.Columns)
{
// 排除不使用 ORM 的属性。
if (ca.Independent || ca.Incremental) excluded.Add(ca.Field);
}
var ps = structure.CreateParameters(record, Parameter, excluded);
var psc = ps.Length;
if (psc < 1) return "数据模型不包含字段。";
var names = new List<string>(psc);
var values = new List<string>(psc);
foreach (var column in ps)
{
//names.Add(TextGenerator.Merge("[", column, "]"));
names.Add(TextUtility.Merge(column));
values.Add("@" + column);
}
var sb = new StringBuilder();
sb.Append("insert into ", table, "(", string.Join(", ", names.ToArray()), ") ");
sb.Append("values(", string.Join(", ", values.ToArray()), "); ");
var sql = sb.ToString();
var execute = Execute(sql, ps, false);
if (execute.Success) return TextUtility.Empty;
return execute.Message;
}
/// <summary></summary>
public override string Update(IRecord record, string table = null, bool adjust = true)
{
if (record == null) return "参数无效。";
if (adjust)
{
FixProperties(record);
SetUpdated(record);
}
var structure = TableStructure.Parse(record.GetType());
if (structure == null) return "无法解析记录模型。";
if (structure.Independent) return "无法更新带有 Independent 特性的模型。";
if (string.IsNullOrEmpty(table)) table = structure.TableName;
if (string.IsNullOrEmpty(table)) return "表名称无效。";
// 排除字段。
var excluded = new List<string>();
if (structure.Key != null) excluded.Add(structure.Key.Field);
foreach (var ca in structure.Columns)
{
// 排除不使用 ORM 的属性、自增属性和主键属性。
if (ca.Independent || ca.Incremental || ca.PrimaryKey || ca.NoUpdate) excluded.Add(ca.Field);
}
var ps = structure.CreateParameters(record, Parameter, excluded);
var psc = ps.Length;
if (psc < 1) return "数据模型不包含字段。";
var items = new List<string>();
foreach (var p in ps)
{
var pn = p.ParameterName;
items.Add(TextUtility.Merge("[", pn, "] = @", pn));
}
var key = record.Key.SafeKey();
var sql = $"update {table} set {string.Join(", ", items.ToArray())} where [{structure.Key.Field}]='{key}'";
var execute = Execute(sql, ps, false);
if (execute.Success) return TextUtility.Empty;
return execute.Message;
}
#endregion
#region protected
/// <summary></summary>
public override string ConnectionString { get => _connstr; }
/// <summary></summary>
protected override IDbConnection GetConnection()
{
if (_conn == null) _conn = new OleDbConnection(_connstr);
return _conn;
}
/// <summary></summary>
protected override IDataAdapter CreateDataAdapter(IDbCommand command) => new OleDbDataAdapter((OleDbCommand)command);
/// <summary></summary>
protected override IDataParameter CreateParameter() => new OleDbParameter();
/// <summary></summary>
protected override string Initialize(TableStructure structure, string table)
{
var model = structure.Model;
if (table.IsEmpty()) table = structure.TableName;
// 检查现存表。
var exists = false;
var tables = TableNames();
if (tables.Length > 0)
{
var lower = table.ToLower();
foreach (var tn in tables)
{
if (TextUtility.IsEmpty(tn)) continue;
if (tn.ToLower() == lower)
{
exists = true;
break;
}
}
}
if (exists)
{
// 获取已存在的列名。
var columns = ColumnNames(table);
if (columns.Length > 0)
{
var lower = new List<string>();
foreach (var column in columns)
{
if (TextUtility.IsBlank(column)) continue;
lower.Add(column.ToLower());
}
columns = lower.ToArray();
}
// 增加列。
foreach (var column in structure.Columns)
{
// 检查 Independent 特性。
if (structure.Independent && column.Independent) continue;
// 去重。
var lower = column.Field.ToLower();
if (columns.Contains(lower)) continue;
var type = Declaration(column);
if (string.IsNullOrEmpty(type)) return TextUtility.Merge("类型 ", column.Type.ToString(), " 不受支持。");
var sql = TextUtility.Merge("alter table [", table, "] add ", type, "; ");
var execute = Execute(sql, null, false);
if (execute.Success == false) return execute.Message;
}
return TextUtility.Empty;
}
else
{
var sqlcolumns = new List<string>();
foreach (var column in structure.Columns)
{
// 检查 Independent 特性。
if (structure.Independent && column.Independent) continue;
var type = Declaration(column);
if (!column.Independent)
{
if (column.PrimaryKey) type = type + " primary key";
if (column.Incremental) type += " identity";
}
if (string.IsNullOrEmpty(type)) return TextUtility.Merge("类型 ", column.Type.ToString(), " 不受支持。");
sqlcolumns.Add(type);
}
if (sqlcolumns.Count < 1) return $"无法对类型 {model.FullName} 创建表:没有定义任何字段。";
var sql = TextUtility.Merge("create table [", table, "](", string.Join(", ", sqlcolumns.ToArray()), "); ");
var execute = Execute(sql, null, false);
if (execute.Success) return TextUtility.Empty;
return execute.Message;
}
}
/// <summary></summary>
protected override string Keys(string tableName, string keyField, string flagField, long flagValue)
{
if (flagValue == 0) return $"select [{keyField}] from [{tableName}]";
else return $"select [{keyField}] from [{tableName}] where [{flagField}] = {flagValue}";
}
/// <summary></summary>
protected override string Get(string tableName, string keyField, string keyValue, string flagField, long flagValue)
{
if (flagValue == 0) return $"select top 1 * from [{tableName}] where [{keyField}] = '{keyValue}'";
else return $"select top 1 * from [{tableName}] where [{keyField}] = '{keyValue}' and [{flagField}] = {flagValue}";
}
/// <summary></summary>
protected override string List(string tableName, string flagField, long flagValue)
{
if (flagValue == 0) return $"select * from [{tableName}]";
else return $"select * from [{tableName}] where [{flagField}] = {flagValue}";
}
#endregion
#region Parameter
/// <summary>创建参数。</summary>
/// <exception cref="ArgumentNullException"></exception>
/// <exception cref="InvalidOperationException"></exception>
static OleDbParameter Parameter(Parameter parameter)
{
if (parameter == null) throw new InvalidOperationException("参数无效。");
return Parameter(parameter.Name, parameter.Type, parameter.Size, parameter.Value);
}
/// <summary>创建参数。</summary>
public static OleDbParameter Parameter(string name, ColumnType type, int size, object value)
{
var vname = TextUtility.Trim(name);
if (TextUtility.IsBlank(vname)) return null;
var vtype = OleDbType.BigInt;
switch (type)
{
case ColumnType.Boolean:
vtype = OleDbType.Boolean;
break;
case ColumnType.Bytes:
vtype = OleDbType.LongVarBinary;
break;
case ColumnType.Integer:
vtype = OleDbType.Integer;
break;
case ColumnType.Float:
vtype = OleDbType.Double;
break;
case ColumnType.DateTime:
vtype = OleDbType.Date;
break;
case ColumnType.VarChar:
case ColumnType.VarChar191:
case ColumnType.VarCharMax:
vtype = OleDbType.VarChar;
break;
case ColumnType.NVarChar:
case ColumnType.NVarChar191:
case ColumnType.NVarCharMax:
vtype = OleDbType.VarWChar;
break;
case ColumnType.Text:
vtype = OleDbType.LongVarChar;
break;
case ColumnType.NText:
vtype = OleDbType.LongVarWChar;
break;
default:
throw new InvalidOperationException(TextUtility.Merge("类型 ", type.ToString(), " 不受支持。"));
}
var vsize = size;
switch (type)
{
case ColumnType.VarChar:
vsize = NumberUtility.Restrict(vsize, 0, 8000);
break;
case ColumnType.NVarChar:
vsize = NumberUtility.Restrict(vsize, 0, 4000);
break;
case ColumnType.VarChar191:
case ColumnType.NVarChar191:
vsize = NumberUtility.Restrict(vsize, 0, 191);
break;
default:
vsize = 0;
break;
}
var vvalue = value;
if (vvalue is string && vvalue != null && vsize > 0)
{
vvalue = TextUtility.Left((string)vvalue, vsize);
}
var parameter = new OleDbParameter();
parameter.ParameterName = vname;
parameter.OleDbType = vtype;
parameter.Value = vvalue;
if (vsize > 0) parameter.Size = vsize;
return parameter;
}
/// <summary>创建参数。</summary>
public static IDbDataParameter CreateParameter(String field, DbType type, Int32 size, Object value)
{
var p = new OleDbParameter();
p.ParameterName = field;
p.DbType = type;
p.Size = size;
p.Value = value;
return p;
}
/// <summary>创建参数。</summary>
public static IDbDataParameter CreateParameter(String field, DbType type, Object value)
{
var p = new OleDbParameter();
p.ParameterName = field;
p.DbType = type;
p.Value = value;
return p;
}
#endregion
#region protected
/// <summary>获取或设置连接字符串。</summary>
/// <exception cref="FileNotFoundException"></exception>
internal protected static string GenerateCS(string provider, string path, string pass, string jo)
{
if (!File.Exists(path)) throw new FileNotFoundException("文件不存在。", path);
var sb = new StringBuilder();
sb.Append("provider=", provider, "; ");
if (!string.IsNullOrEmpty(path)) sb.Append("data source=", path, "; ");
if (string.IsNullOrEmpty(pass)) sb.Append("persist security info=false; ");
else sb.Append("jet oledb:database password=\"", pass, "\"; ");
// Microsoft Access Workgroup Information
if (!string.IsNullOrEmpty(jo)) sb.Append("jet oledb:system database=", jo, "; ");
return sb.ToString();
}
#endregion
#region static
static string Declaration(ColumnAttribute column)
{
var type = TextUtility.Empty;
var vcolumn = column;
var length = Math.Max(0, vcolumn.Length);
switch (vcolumn.Type)
{
case ColumnType.Boolean:
type = "bit";
break;
case ColumnType.Integer:
type = "money";
break;
case ColumnType.Float:
type = "float";
break;
case ColumnType.Bytes:
type = "binary";
break;
case ColumnType.DateTime:
type = "datetime";
break;
case ColumnType.VarChar:
type = TextUtility.Merge("varchar(", Math.Min(8000, length).ToString(), ")");
break;
case ColumnType.VarChar191:
type = TextUtility.Merge("varchar(191)");
break;
case ColumnType.VarCharMax:
type = TextUtility.Merge("varchar(max)");
break;
case ColumnType.Text:
type = TextUtility.Merge("text");
break;
case ColumnType.NVarChar:
type = TextUtility.Merge("nvarchar(", Math.Min(4000, length).ToString(), ")");
break;
case ColumnType.NVarChar191:
type = TextUtility.Merge("nvarchar(191)");
break;
case ColumnType.NVarCharMax:
type = TextUtility.Merge("nvarchar(max)");
break;
case ColumnType.NText:
type = TextUtility.Merge("ntext");
break;
default:
return TextUtility.Empty;
}
return TextUtility.Merge("[", vcolumn.Field, "] ", type);
}
#endregion
}
/// <summary>使用 Microsoft.Jet.OLEDB.4.0 访问 Access 97 - 2003 数据库文件。</summary>
public class AccessJet4 : Access
{
const string JetOleDB4 = "microsoft.jet.oledb.4.0";
/// <summary>创建 Access 类的新实例。</summary>
/// <exception cref="FileNotFoundException"></exception>
public AccessJet4(string path, string pass = null, string jo = null, Timeout timeout = null)
: base(GenerateCS(JetOleDB4, path, pass, jo), timeout)
{
Path = path;
}
/// <summary>使用连接字符串创建数据库连接实例。</summary>
/// <exception cref="ArgumentNullException"></exception>
/// <exception cref="ArgumentException"></exception>
public AccessJet4(IDbConnection connection, Timeout timeout = null) : base(connection, timeout)
{
Path = (connection as Access)?.Path;
}
/// <summary>生成新的 Standard Jet DB 数据库。</summary>
public static byte[] NewJetDB()
{
using (var resource = Assembly.GetExecutingAssembly().GetManifestResourceStream("Apewer.JETDB.gz"))
{
using (var gzip = new GZipStream(resource, CompressionMode.Decompress, false))
{
using (var memory = new MemoryStream())
{
BytesUtility.Read(gzip, memory, null, 1024);
return memory.ToArray();
}
}
}
}
}
/// <summary>使用 Microsoft.ACE.OLEDB.12.0 访问 Access 2007 数据库文件。</summary>
public class AccessAce12 : Access
{
const string AceOleDB12 = "microsoft.ace.oledb.12.0";
/// <summary>创建 Access 类的新实例。</summary>
/// <exception cref="FileNotFoundException"></exception>
public AccessAce12(string path, string pass = null, string jo = null, Timeout timeout = null)
: base(GenerateCS(AceOleDB12, path, pass, jo), timeout)
{
Path = path;
}
/// <summary>使用连接字符串创建数据库连接实例。</summary>
/// <exception cref="ArgumentNullException"></exception>
/// <exception cref="ArgumentException"></exception>
public AccessAce12(IDbConnection connection, Timeout timeout = null) : base(connection, timeout)
{
Path = (connection as Access)?.Path;
}
/// <summary>生成新的 Standard ACE DB 数据库。</summary>
public static byte[] NewAceDB()
{
using (var resource = Assembly.GetExecutingAssembly().GetManifestResourceStream("Apewer.ACEDB.gz"))
{
using (var gzip = new GZipStream(resource, CompressionMode.Decompress, false))
{
using (var memory = new MemoryStream())
{
BytesUtility.Read(gzip, memory, null, 1024);
return memory.ToArray();
}
}
}
}
}
#endif
}