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CommandHelper.cs
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using System;
using System.Collections.Generic;
using System.Data;
using System.Dynamic;
using System.Text;
using System.Text.RegularExpressions;
using Simple.Data.Ado.Schema;
namespace Simple.Data.Ado
{
using System.Linq;
public class CommandHelper
{
private readonly AdoAdapter _adapter;
private readonly ISchemaProvider _schemaProvider;
public CommandHelper(AdoAdapter adapter)
{
_adapter = adapter;
_schemaProvider = adapter.SchemaProvider;
}
internal IDbCommand Create(IDbConnection connection, string sql, IList<object> values)
{
var command = connection.CreateCommand(_adapter.AdoOptions);
command.CommandText = PrepareCommand(sql, command);
command.ClearParameterValues();
command.SetParameterValues(values);
return command;
}
internal IDbCommand Create(IDbConnection connection, CommandBuilder commandBuilder)
{
var command = connection.CreateCommand(_adapter.AdoOptions);
command.CommandText = commandBuilder.Text;
PrepareCommand(commandBuilder, command);
return command;
}
private string PrepareCommand(IEnumerable<char> sql, IDbCommand command)
{
var parameterFactory = _adapter.ProviderHelper.GetCustomProvider<IDbParameterFactory>(_schemaProvider)
?? new GenericDbParameterFactory(command);
int index = 0;
var sqlBuilder = new StringBuilder();
foreach (var c in sql)
{
if (c == '?')
{
var parameter = parameterFactory.CreateParameter(_schemaProvider.NameParameter("p" + index));
//parameter.ParameterName = _schemaProvider.NameParameter("p" + index);
command.Parameters.Add(parameter);
sqlBuilder.Append(parameter.ParameterName);
index++;
}
else
{
sqlBuilder.Append(c);
}
}
return sqlBuilder.ToString();
}
private string PrepareInsertCommand(string sql, IDbCommand command, IEnumerable<Column> columns)
{
var parameterFactory = _adapter.ProviderHelper.GetCustomProvider<IDbParameterFactory>(_schemaProvider)
?? new GenericDbParameterFactory(command);
var columnLookup = columns.ToDictionary(c => c.QuotedName, c => c);
if (columnLookup.Count == 0) return PrepareCommand(sql, command);
int openParenIndex = sql.IndexOf('(');
int closeParenLength = sql.IndexOf(')') - openParenIndex;
var columnNameList = sql.Substring(openParenIndex, closeParenLength).Trim('(', ')').Split(',');
int index = 0;
var sqlBuilder = new StringBuilder();
foreach (var c in sql)
{
if (c == '?')
{
var column = columnLookup[columnNameList[index]];
var parameter = parameterFactory.CreateParameter(_schemaProvider.NameParameter("p" + index), column);
command.Parameters.Add(parameter);
sqlBuilder.Append(parameter.ParameterName);
index++;
}
else
{
sqlBuilder.Append(c);
}
}
return sqlBuilder.ToString();
}
private static void PrepareCommand(CommandBuilder commandBuilder, IDbCommand command)
{
foreach (var pair in commandBuilder.Parameters)
{
var parameter = command.CreateParameter();
parameter.ParameterName = pair.Key.Name;
parameter.DbType = pair.Key.DbType;
parameter.Size = pair.Key.MaxLength;
parameter.Value = FixObjectType(pair.Value);
command.Parameters.Add(parameter);
}
}
public static object FixObjectType(object value)
{
if (value == null) return DBNull.Value;
if (TypeHelper.IsKnownType(value.GetType())) return value;
if (value is Enum) return value;
var asString = value.ToString();
if (asString != value.GetType().FullName) return asString;
return value;
}
public IDbCommand Create(IDbConnection connection, string insertSql)
{
var command = connection.CreateCommand(_adapter.AdoOptions);
command.CommandText = PrepareCommand(insertSql, command);
return command;
}
public IDbCommand CreateInsert(IDbConnection connection, string insertSql, IEnumerable<Column> columns)
{
var command = connection.CreateCommand(_adapter.AdoOptions);
command.CommandText = PrepareInsertCommand(insertSql, command, columns);
command.ClearParameterValues();
return command;
}
public IDbCommand CreateInsert(IDbConnection connection, string sql, IEnumerable<Column> columns, IList<object> values)
{
var command = connection.CreateCommand(_adapter.AdoOptions);
command.CommandText = PrepareInsertCommand(sql, command, columns);
command.ClearParameterValues();
command.SetParameterValues(values);
return command;
}
}
}