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CommandTemplate.cs
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154 lines (141 loc) · 6.89 KB
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using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Dynamic;
using System.Linq;
using System.Text;
using Simple.Data.Ado.Schema;
namespace Simple.Data.Ado
{
public class CommandTemplate
{
private readonly Func<IDbCommand, IDbParameterFactory> _createGetParameterFactoryFunc;
private readonly string _commandText;
private readonly ParameterTemplate[] _parameters;
private readonly Dictionary<string, int> _index;
public CommandTemplate(Func<IDbCommand, IDbParameterFactory> createGetParameterFactoryFunc, string commandText, ParameterTemplate[] parameterNames, Dictionary<string, int> index)
{
_createGetParameterFactoryFunc = createGetParameterFactoryFunc;
_commandText = commandText;
_parameters = parameterNames;
_index = index;
}
public Dictionary<string, int> Index
{
get { return _index; }
}
public IDbCommand GetDbCommand(AdoAdapter adapter, IDbConnection connection, IEnumerable<object> parameterValues)
{
var command = connection.CreateCommand(adapter.AdoOptions);
command.CommandText = _commandText;
foreach (var parameter in CreateParameters(adapter.GetSchema(), command, parameterValues))
{
command.Parameters.Add(parameter);
}
return command;
}
private IEnumerable<IDbDataParameter> CreateParameters(DatabaseSchema schema, IDbCommand command, IEnumerable<object> parameterValues)
{
var fixedParameters = _parameters.Where(pt => pt.Type == ParameterType.FixedValue).ToArray();
if ((!parameterValues.Any(pv => pv != null)) && fixedParameters.Length == 0) yield break;
parameterValues = parameterValues.Where(pv => pv != null);
foreach (var fixedParameter in fixedParameters)
{
yield return CreateParameter(command, fixedParameter, fixedParameter.FixedValue);
}
var columnParameters = _parameters.Where(pt => pt.Type != ParameterType.FixedValue).ToArray();
foreach (var parameter in parameterValues.Any(o => o is IEnumerable && !(o is string)) || parameterValues.Any(o => o is IRange)
? parameterValues.SelectMany((v, i) => CreateParameters(schema, command, columnParameters[i], v))
: parameterValues.Select((v, i) => CreateParameter(command, columnParameters[i], v)))
{
yield return parameter;
}
}
private IEnumerable<IDbDataParameter> CreateParameters(DatabaseSchema schema, IDbCommand command, ParameterTemplate parameterTemplate, object value)
{
if (value == null || TypeHelper.IsKnownType(value.GetType()) || parameterTemplate.DbType == DbType.Binary)
{
yield return CreateParameter(command, parameterTemplate, value);
}
else
{
var range = value as IRange;
if (range != null)
{
yield return CreateParameter(command, parameterTemplate, range.Start, "_start");
yield return CreateParameter(command, parameterTemplate, range.End, "_end");
new CommandBuilder(schema).SetBetweenInCommandText(command, parameterTemplate.Name);
}
else
{
var list = value as IEnumerable;
if (list != null)
{
var builder = new StringBuilder();
var array = list.Cast<object>().ToArray();
for (int i = 0; i < array.Length; i++)
{
builder.AppendFormat(",{0}_{1}", parameterTemplate.Name, i);
yield return CreateParameter(command, parameterTemplate, array[i], "_" + i);
}
RewriteSqlEqualityToInClause(schema, command, parameterTemplate, builder);
}
else
{
yield return CreateParameter(command, parameterTemplate, value);
}
}
}
}
private static void RewriteSqlEqualityToInClause(DatabaseSchema schema, IDbCommand command, ParameterTemplate parameterTemplate, StringBuilder builder)
{
if (command.CommandText.Contains("!= " + parameterTemplate.Name))
{
command.CommandText = command.CommandText.Replace("!= " + parameterTemplate.Name,
schema.Operators.NotIn + " (" +
builder.ToString().Substring(1) +
")");
}
else
{
command.CommandText = command.CommandText.Replace("= " + parameterTemplate.Name,
schema.Operators.In + " (" +
builder.ToString().Substring(1) +
")");
}
}
private IDbDataParameter CreateParameter(IDbCommand command, ParameterTemplate parameterTemplate, object value, string suffix = "")
{
var factory = _createGetParameterFactoryFunc(command);
var parameter = default(IDbDataParameter);
if(parameterTemplate.Column != null)
{
parameter = factory.CreateParameter(parameterTemplate.Name + suffix,
parameterTemplate.Column);
}
else if (parameterTemplate.Type == ParameterType.NameOnly)
{
parameter = factory.CreateParameter(parameterTemplate.Name);
}
else
{
parameter = factory.CreateParameter(parameterTemplate.Name, parameterTemplate.DbType,
parameterTemplate.MaxLength);
}
parameter.Value = FixObjectType(value);
return parameter;
}
private static object FixObjectType(object value)
{
if (value == null) return DBNull.Value;
if (TypeHelper.IsKnownType(value.GetType())) return value;
var dynamicObject = value as DynamicObject;
if (dynamicObject != null)
{
return dynamicObject.ToString();
}
return value;
}
}
}