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- 修复 Ado.Query 查询字段重复时报错；#162 #165 #161 - 增加 FreeSql.Provider.MsAccess 支持 Access 数据库操作，已通过 2003/2007 版本测试；

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28810
2019-12-24 06:16:52 +08:00
parent d5ed1c8a30
commit a92c279c72
69 changed files with 10380 additions and 207 deletions
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126
Providers/FreeSql.Provider.MsAccess/MsAccessUtils.cs Normal file
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using FreeSql.Internal;
using FreeSql.Internal.Model;
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.Common;
using System.Data.OleDb;
using System.Linq;
using System.Linq.Expressions;
using System.Text;
namespace FreeSql.MsAccess
{
public class MsAccessUtils : CommonUtils
{
public MsAccessUtils(IFreeSql orm) : base(orm)
{
}
public override DbParameter AppendParamter(List<DbParameter> _params, string parameterName, ColumnInfo col, Type type, object value)
{
if (string.IsNullOrEmpty(parameterName)) parameterName = $"p_{_params?.Count}";
if (value?.Equals(DateTime.MinValue) == true) value = new DateTime(1970, 1, 1);
var ret = new OleDbParameter { ParameterName = QuoteParamterName(parameterName), Value = value };
var tp = _orm.CodeFirst.GetDbInfo(type)?.type;
if (tp != null) ret.OleDbType = (OleDbType)tp.Value;
_params?.Add(ret);
return ret;
}
public override DbParameter[] GetDbParamtersByObject(string sql, object obj) =>
Utils.GetDbParamtersByObject<OleDbParameter>(sql, obj, null, (name, type, value) =>
{
if (value?.Equals(DateTime.MinValue) == true) value = new DateTime(1970, 1, 1);
var ret = new OleDbParameter { ParameterName = $"@{name}", Value = value };
var tp = _orm.CodeFirst.GetDbInfo(type)?.type;
if (tp != null) ret.OleDbType = (OleDbType)tp.Value;
return ret;
});
public override string FormatSql(string sql, params object[] args) => sql?.FormatAccess(args);
public override string QuoteSqlName(string name)
{
var nametrim = name.Trim();
if (nametrim.StartsWith("(") && nametrim.EndsWith(")"))
return nametrim; //原生SQL
return $"[{nametrim.TrimStart('[').TrimEnd(']').Replace(".", "].[")}]";
}
public override string TrimQuoteSqlName(string name)
{
var nametrim = name.Trim();
if (nametrim.StartsWith("(") && nametrim.EndsWith(")"))
return nametrim; //原生SQL
return $"{nametrim.TrimStart('[').TrimEnd(']').Replace("].[", ".").Replace(".[", ".")}";
}
public override string QuoteParamterName(string name) => $"@{(_orm.CodeFirst.IsSyncStructureToLower ? name.ToLower() : name)}";
public override string IsNull(string sql, object value) => $"iif(isnull({sql}), {value}, {sql})";
public override string StringConcat(string[] objs, Type[] types)
{
var sb = new StringBuilder();
var news = new string[objs.Length];
for (var a = 0; a < objs.Length; a++)
{
if (types[a] == typeof(string)) news[a] = objs[a];
else news[a] = MsAccessUtils.GetCastSql(objs[a], typeof(string));
}
return string.Join(" + ", news);
}
public override string Mod(string left, string right, Type leftType, Type rightType) => $"{left} mod {right}";
public override string Div(string left, string right, Type leftType, Type rightType) => $"{left} / {right}";
public override string Now => "now()";
public override string NowUtc => "now()";
public override string QuoteWriteParamter(Type type, string paramterName) => paramterName;
public override string QuoteReadColumn(Type type, string columnName) => columnName;
public override string FieldAsAlias(string alias) => $" as {alias}";
public override string IIF(string test, string ifTrue, string ifElse) => $"iif({test}, {ifTrue}, {ifElse})";
public override string GetNoneParamaterSqlValue(List<DbParameter> specialParams, Type type, object value)
{
if (value == null) return "NULL";
if (type == typeof(byte[]))
{
var bytes = value as byte[];
var sb = new StringBuilder().Append("0x");
foreach (var vc in bytes)
{
if (vc < 10) sb.Append("0");
sb.Append(vc.ToString("X"));
}
return sb.ToString();
}
else if (type == typeof(TimeSpan) || type == typeof(TimeSpan?))
{
var ts = (TimeSpan)value;
value = $"{ts.Hours}:{ts.Minutes}:{ts.Seconds}";
}
return FormatSql("{0}", value, 1);
}
public static string GetCastSql(string sqlExp, Type toType)
{
switch (toType.ToString())
{
case "System.Boolean": return $"(cstr({sqlExp}) not in ('0','false'))";
case "System.Byte": return $"cbyte({sqlExp})";
case "System.Char": return $"left(cstr({sqlExp}),1)";
case "System.DateTime": return $"cdate({sqlExp})";
case "System.Decimal": return $"ccur({sqlExp})";
case "System.Double": return $"cdbl({sqlExp})";
case "System.Int16": return $"cint({sqlExp})";
case "System.Int32": return $"cint({sqlExp})";
case "System.Int64": return $"clng({sqlExp})";
case "System.SByte": return $"cint({sqlExp})";
case "System.Single": return $"csng({sqlExp})";
case "System.String": return $"cstr({sqlExp})";
case "System.UInt16": return $"cint({sqlExp})";
case "System.UInt32": return $"clng({sqlExp})";
case "System.UInt64": return $"clng({sqlExp})";
case "System.Guid": return $"cstr({sqlExp})";
}
return sqlExp;
}
}
}