public static ExpressionClip operator /(object left, ExpressionClip right)
{
ExpressionClip expr = ExpressionFactory.CreateParameterExpression(right.dbType, left);
ExpressionFactory.AppendExpression(expr, QueryOperator.Divide, right);
return(expr);
}
public ExpressionClip SubString(int start, int length)
{
ExpressionClip expr = ExpressionFactory.CreateCloneExpression(this);
expr.Sql = ColumnFormatter.SubString(this.Sql, start, length);
return(expr);
}
internal protected ExpressionClip Append(QueryOperator op, ExpressionClip right)
{
this.sql.Append(SqlQueryUtils.ToString(op));
this.sql.Append(SqlQueryUtils.ToString(right));
SqlQueryUtils.AddParameters(this.parameters, right);
return(this);
}
public ExpressionClip Replace(string subString, string replaceString)
{
Check.Require(!string.IsNullOrEmpty(subString), "subString could not be null or empty!");
Check.Require(!string.IsNullOrEmpty(replaceString), "replaceString could not be null or empty!");
ExpressionClip expr = ExpressionFactory.CreateCloneExpression(this);
StringBuilder sb = new StringBuilder();
sb.Append("REPLACE(");
SqlQueryUtils.AppendColumnName(sb, this.Sql);
sb.Append(',');
string paramName = MakeUniqueParamNameWithoutPrefixToken();
sb.Append(paramName);
sb.Append(',');
string paramName2 = MakeUniqueParamNameWithoutPrefixToken();
sb.Append(paramName2);
sb.Append(')');
expr.sql = sb;
expr.dbType = DbType.Int32;
expr.parameters.Add(paramName, new KeyValuePair <DbType, object>(this.dbType, subString));
expr.Parameters.Add(paramName2, new KeyValuePair <DbType, object>(this.dbType, replaceString));
return(expr);
}
public static ExpressionClip operator!(ExpressionClip left)
{
ExpressionClip expr = ExpressionFactory.AppendExpression(new ExpressionClip(), QueryOperator.BitwiseNOT,
left);
return(expr);
}
public static ExpressionClip operator /(ExpressionClip left, ExpressionClip right)
{
ExpressionClip expr = ExpressionFactory.CreateCloneExpression(left);
ExpressionFactory.AppendExpression(expr, QueryOperator.Divide, right);
return(expr);
}
public static ExpressionClip operator /(ExpressionClip left, object right)
{
ExpressionClip expr = ExpressionFactory.CreateCloneExpression(left);
ExpressionFactory.AppendExpression(expr, QueryOperator.Divide,
ExpressionFactory.CreateParameterExpression(left.dbType, right));
return(expr);
}
public static ExpressionClip operator %(object left, ExpressionClip right)
{
ExpressionClip expr = ExpressionFactory.CreateParameterExpression(right.dbType, left);
ExpressionFactory.AppendExpression(expr, QueryOperator.Modulo, right);
expr.dbType = DbType.Int32;
return(expr);
}
public ExpressionClip Avg()
{
ExpressionClip expr = ExpressionFactory.CreateCloneExpression(this);
expr.Sql = ColumnFormatter.Avg(this.Sql);
return(expr);
}
public static ExpressionClip GetCurrentDate()
{
ExpressionClip expr = new ExpressionClip();
expr.Sql = ColumnFormatter.GetCurrentDate();
expr.dbType = DbType.DateTime;
return(expr);
}
public static ExpressionClip operator %(ExpressionClip left, ExpressionClip right)
{
ExpressionClip expr = ExpressionFactory.CreateCloneExpression(left);
ExpressionFactory.AppendExpression(expr, QueryOperator.Modulo, right);
expr.dbType = DbType.Int32;
return(expr);
}
public ExpressionClip Count(bool isDistinct)
{
ExpressionClip expr = ExpressionFactory.CreateCloneExpression(this);
expr.Sql = ColumnFormatter.Count(this.Sql, isDistinct);
expr.dbType = DbType.Int32;
return(expr);
}
public ExpressionClip GetDay()
{
ExpressionClip expr = ExpressionFactory.CreateCloneExpression(this);
expr.Sql = ColumnFormatter.DatePart(this.Sql, ColumnFormatter.DatePartType.Day);
expr.dbType = DbType.Int32;
return(expr);
}
public ExpressionClip BitwiseAnd(ExpressionClip right)
{
ExpressionClip expr = ExpressionFactory.CreateCloneExpression(this);
ExpressionFactory.AppendExpression(expr, QueryOperator.BitwiseAND,
right);
return(expr);
}
public ExpressionClip BitwiseAnd(object right)
{
Check.Require(right != null, "right could not be null!");
ExpressionClip expr = ExpressionFactory.CreateCloneExpression(this);
ExpressionFactory.AppendExpression(expr, QueryOperator.BitwiseAND,
ExpressionFactory.CreateParameterExpression(this.dbType, right));
return(expr);
}
internal protected WhereClip Or(ExpressionClip left, QueryOperator op, ExpressionClip right)
{
if (this.sql.Length > 0)
{
this.sql.Append(" OR ");
}
this.sql.Append(SqlQueryUtils.ToString(left));
this.sql.Append(SqlQueryUtils.ToString(op));
this.sql.Append(SqlQueryUtils.ToString(right));
SqlQueryUtils.AddParameters(this.parameters, left);
SqlQueryUtils.AddParameters(this.parameters, right);
return(this);
}
public static WhereClip operator <=(ExpressionClip left, ExpressionClip right)
{
WhereClip where = new WhereClip();
if (ExpressionClip.IsNullOrEmpty(right))
{
where = ExpressionFactory.AppendWhereAnd(where, left, QueryOperator.LessOrEqual, null);
}
else if (ExpressionClip.IsNullOrEmpty(left))
{
where = ExpressionFactory.AppendWhereAnd(where, right, QueryOperator.GreaterOrEqual, null);
}
else
{
ExpressionFactory.AppendWhereAnd(where, left, QueryOperator.LessOrEqual, right);
}
return(where);
}
public ExpressionClip SubString(int start)
{
Check.Require(start >= 0, "start must >= 0!");
ExpressionClip expr = ExpressionFactory.CreateCloneExpression(this);
ExpressionClip cloneExpr = ExpressionFactory.CreateCloneExpression(this);
StringBuilder sb = new StringBuilder("SUBSTRING(");
SqlQueryUtils.AppendColumnName(sb, this.Sql);
sb.Append(',');
sb.Append(start + 1);
sb.Append(",LEN(");
SqlQueryUtils.AppendColumnName(sb, cloneExpr.Sql);
sb.Append(')');
sb.Append(')');
expr.sql = sb;
SqlQueryUtils.AddParameters(expr.parameters, cloneExpr);
return(expr);
}
public virtual object Clone()
{
ExpressionClip newExpr = new ExpressionClip();
newExpr.dbType = this.dbType;
string tempSql = this.sql.ToString();
Dictionary <string, KeyValuePair <DbType, object> > .Enumerator en = this.parameters.GetEnumerator();
while (en.MoveNext())
{
object value = en.Current.Value.Value;
if (value != null && value != DBNull.Value && value is ICloneable)
{
value = ((ICloneable)value).Clone();
}
string newParamName = MakeUniqueParamNameWithoutPrefixToken();
tempSql = tempSql.Replace('@' + en.Current.Key, '@' + newParamName);
newExpr.Parameters.Add(newParamName, new KeyValuePair <DbType, object>(en.Current.Value.Key, value));
}
newExpr.sql.Append(tempSql);
return(newExpr);
}
public DbCommand CreateUpdateCommand(string tableName, WhereClip where, string[] columns, DbType[] types, object[] values)
{
Check.Require(!string.IsNullOrEmpty(tableName), "tableName could not be null or empty!");
//if (where != null)
//{
// Check.Require(where.From == null, "expr.From must be null in Update");
//}
Check.Require(columns != null && types != null && values != null && columns.Length == types.Length && columns.Length == values.Length,
"length of columns, types and values must equal!");
DbCommand cmd = fac.CreateCommand();
cmd.CommandType = CommandType.Text;
StringBuilder sb = new StringBuilder("UPDATE ");
sb.Append(leftToken);
sb.Append(tableName.TrimStart(leftToken).TrimEnd(rightToken));
sb.Append(rightToken);
sb.Append(' ');
sb.Append("SET ");
for (int i = 0; i < columns.Length; ++i)
{
sb.Append(leftToken);
sb.Append(columns[i].TrimStart(leftToken).TrimEnd(rightToken));
sb.Append(rightToken);
sb.Append('=');
if (values[i] != null && values[i] is ExpressionClip)
{
ExpressionClip expr = (ExpressionClip)values[i];
sb.Append(expr.ToString());
AddExpressionParameters(expr, cmd);
}
else
{
string paramName = MakeUniqueParamNameWithPrefixToken();
sb.Append(paramName);
DbParameter p = cmd.CreateParameter();
p.ParameterName = paramName;
p.DbType = types[i];
p.Value = values[i] == null ? DBNull.Value : values[i];
cmd.Parameters.Add(p);
}
if (i < columns.Length - 1)
{
sb.Append(',');
}
}
if ((!WhereClip.IsNullOrEmpty(where)) && where.Sql.Length > 0)
{
sb.Append(" WHERE ");
sb.Append(SqlQueryUtils.RemoveTableAliasNamePrefixes(where.Sql));
AddExpressionParameters(where, cmd);
}
cmd.CommandText = SqlQueryUtils.ReplaceDatabaseTokens(sb.ToString(), leftToken, rightToken, paramPrefixToken, wildcharToken, wildsinglecharToken);
PrepareCommand(cmd);
return(cmd);
}
public static WhereClip AppendWhereOr(WhereClip where, ExpressionClip left, QueryOperator op, ExpressionClip right)
{
return(where.Or(left, op, right));
}
public static ExpressionClip AppendExpression(ExpressionClip left, QueryOperator op, ExpressionClip right)
{
return(left.Append(op, right));
}
public static ExpressionClip CreateCloneExpression(ExpressionClip expr)
{
Check.Require(!ExpressionClip.IsNullOrEmpty(expr));
return((ExpressionClip)expr.Clone());
}
public static bool IsNullOrEmpty(ExpressionClip expr)
{
return(((object)expr) == null || expr.sql.Length == 0);
}
