internal void Delete(Entity entity)
{
SqlStatement sql = new SqlStatement();
// delete...
StringBuilder builder = new StringBuilder();
builder.Append("delete from ");
builder.Append(this.EntityType.NativeName);
builder.Append(" where ");
AppendSelectConstraint(builder, sql, entity);
// run...
sql.CommandText = builder.ToString();
// run...
SqlCeHelper db = new SqlCeHelper();
db.EnsureTableExists(entity.EntityType);
db.ExecuteNonQuery(sql);
}
internal void Update(Entity entity)
{
SqlStatement sql = new SqlStatement();
// create...
StringBuilder builder = new StringBuilder();
builder.Append("update ");
builder.Append(this.EntityType.NativeName);
builder.Append(" set ");
bool first = true;
foreach (EntityField field in this.EntityType.Fields)
{
if (entity.IsModified(field))
{
if (first)
first = false;
else
builder.Append(", ");
builder.Append(field.NativeName);
builder.Append("=@");
// value...
object value = entity.GetValue(field);
builder.Append(sql.AddParameter(value).Name);
}
}
builder.Append(" where ");
this.AppendSelectConstraint(builder, sql, entity);
// run...
sql.CommandText = builder.ToString();
// run...
SqlCeHelper db = new SqlCeHelper();
db.EnsureTableExists(entity.EntityType);
db.ExecuteNonQuery(sql);
}
private void AppendSelectConstraint(StringBuilder builder, SqlStatement sql, Entity entity)
{
if (builder == null)
throw new ArgumentNullException("builder");
if (sql == null)
throw new ArgumentNullException("sql");
if (entity == null)
throw new ArgumentNullException("entity");
// run...
EntityField key = this.EntityType.GetKeyField();
if (key == null)
throw new InvalidOperationException("'key' is null.");
builder.Append(key.NativeName);
builder.Append("=@");
builder.Append(sql.AddParameter(entity.GetValue(key)).Name);
}
internal void Insert(Entity entity)
{
SqlStatement sql = new SqlStatement();
// create...
StringBuilder builder = new StringBuilder();
builder.Append("insert into ");
builder.Append(this.EntityType.NativeName);
builder.Append(" (");
bool first = true;
foreach (EntityField field in this.EntityType.Fields)
{
if (entity.IsModified(field))
{
if (first)
first = false;
else
builder.Append(", ");
builder.Append(field.NativeName);
}
}
builder.Append(") values (");
first = true;
foreach (EntityField field in this.EntityType.Fields)
{
if (entity.IsModified(field))
{
if (first)
first = false;
else
builder.Append(", ");
// param...
object value = entity.GetValue(field);
SqlStatementParameter param = sql.AddParameter(value);
builder.Append("@");
builder.Append(param.Name);
}
}
builder.Append(")");
// run...
sql.CommandText = builder.ToString();
// run...
SqlCeHelper db = new SqlCeHelper();
db.EnsureTableExists(entity.EntityType);
db.ExecuteNonQuery(sql);
}
