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UpdateHelper.cs
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128 lines (115 loc) · 5.77 KB
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Simple.Data.Ado.Schema;
namespace Simple.Data.Ado
{
using System.Diagnostics;
using Extensions;
internal class UpdateHelper
{
private readonly DatabaseSchema _schema;
private readonly ICommandBuilder _commandBuilder;
private readonly IExpressionFormatter _expressionFormatter;
public UpdateHelper(DatabaseSchema schema)
{
_schema = schema;
_commandBuilder = new CommandBuilder(schema);
_expressionFormatter = new ExpressionFormatter(_commandBuilder, _schema);
}
public ICommandBuilder GetUpdateCommand(string tableName, IDictionary<string, object> data, SimpleExpression criteria)
{
var table = _schema.FindTable(tableName);
var updateClause = GetUpdateClause(table, data);
if (string.IsNullOrWhiteSpace(updateClause)) throw new InvalidOperationException("No columns to update.");
_commandBuilder.Append(updateClause);
if (criteria != null )
{
string whereStatement = null;
if (criteria.GetOperandsOfType<ObjectReference>().Any(o => IsTableChain(tableName, o)))
{
if (table.PrimaryKey.Length == 1)
{
whereStatement = CreateWhereInStatement(criteria, table);
}
else if (table.PrimaryKey.Length > 1)
{
whereStatement = CreateWhereExistsStatement(criteria, table);
}
}
else
{
whereStatement = _expressionFormatter.Format(criteria);
}
if (!string.IsNullOrEmpty(whereStatement))
_commandBuilder.Append(" where " + whereStatement);
}
return _commandBuilder;
}
private bool IsTableChain(string tableName, ObjectReference o)
{
var ownerName = tableName.Contains(".") ? o.GetOwner().GetAllObjectNamesDotted() : o.GetOwner().GetName();
return (!ownerName.Equals(tableName, StringComparison.InvariantCultureIgnoreCase)) && _schema.IsTable(ownerName);
}
private string CreateWhereInStatement(SimpleExpression criteria, Table table)
{
var inClauseBuilder = new CommandBuilder(_schema);
var keyColumn = table.FindColumn(table.PrimaryKey[0]);
inClauseBuilder.Append(string.Format("SELECT {0} FROM {1}",
keyColumn.QualifiedName, table.QualifiedName));
inClauseBuilder.Append(" ");
inClauseBuilder.Append(string.Join(" ",
new Joiner(JoinType.Inner, _schema).GetJoinClauses(
new ObjectName(table.Schema, table.ActualName), criteria)));
inClauseBuilder.Append(" where ");
inClauseBuilder.Append(_expressionFormatter.Format(criteria));
return string.Format("{0} IN ({1})", keyColumn.QualifiedName, inClauseBuilder.Text);
}
private string CreateWhereExistsStatement(SimpleExpression criteria, Table table)
{
var inClauseBuilder = new CommandBuilder(_schema);
inClauseBuilder.Append(string.Join(" ",
new Joiner(JoinType.Inner, _schema).GetJoinClauses(
new ObjectName(table.Schema, table.ActualName), criteria)));
inClauseBuilder.Append(" where ");
inClauseBuilder.Append(_expressionFormatter.Format(criteria));
var updateJoin = _schema.QuoteObjectName("_updatejoin");
var whereClause = new StringBuilder(string.Format("SELECT 1 FROM {0} [_updatejoin] ", table.QualifiedName));
whereClause.Append(inClauseBuilder.Text.Replace(table.QualifiedName, updateJoin));
whereClause.Append(" AND (");
bool appendAnd = false;
foreach (var column in table.PrimaryKey.AsEnumerable().Select(table.FindColumn))
{
if (appendAnd) whereClause.Append(" AND ");
whereClause.AppendFormat("{0}.{1} = {2}", updateJoin, column.QuotedName, column.QualifiedName);
appendAnd = true;
}
whereClause.Append(")");
return string.Format("EXISTS ({0})", whereClause);
}
private string GetUpdateClause(Table table, IEnumerable<KeyValuePair<string, object>> data)
{
var setClause = string.Join(", ",
data.Where(kvp => table.HasColumn(kvp.Key) && table.FindColumn(kvp.Key).IsWriteable)
.Select(kvp => CreateColumnUpdateClause(kvp.Key, kvp.Value, table)));
return string.Format("update {0} set {1}", table.QualifiedName, setClause);
}
private string CreateColumnUpdateClause(string columnName, object value, Table table)
{
var column = table.FindColumn(columnName);
var mathReference = value as SimpleReference;
string rightOperand;
if (ReferenceEquals(mathReference, null))
{
rightOperand = _commandBuilder.AddParameter(value, column).Name;
}
else
{
rightOperand =
new SimpleReferenceFormatter(_schema, _commandBuilder).FormatColumnClauseWithoutAlias(mathReference);
}
return string.Format("{0} = {1}", column.QuotedName, rightOperand);
}
}
}