FunctionCallExpression

The FunctionCallExpression is part of the Dynamic Where feature; it expression represents a server-side call to a certain SQL function.

Supported SQL functions are:

`Trim`	`TrimLeft`	`TrimRight`
`Length`	`UpperCase`	`LowerCase`

Implementations

Example

Target SQL where clause:

WHERE LTRIM(customer_name) = "TEST"

WhereExpression whereExpression = new BinaryExpression(
                  new FunctionCallExpression(
                    new FieldExpression("customer_name"),
                    FunctionKind.TrimLeft)),
                  new ConstantExpression("TEST", DataType.String),
                  BinaryOperator.Equal);

let whereExpression = BinaryExpression(
            FunctionCallExpression(
              FieldExpression("customer_name"),
              FunctionKind.TrimLeft)),
            ConstantExpression("TEST", DataType.String),
            BinaryOperator.Equal);

WhereExpression where = new BinaryExpression(
              new FunctionCallExpression(
                new FieldExpression("customer_name"),
                FunctionKind.TrimLeft)),
              new ConstantExpression("TEST", DataType.String),
              BinaryOperator.Equal);

let whereExpression = BinaryExpression(
            FunctionCallExpression(
              FieldExpression("customer_name"),
              FunctionKind.TrimLeft)),
            ConstantExpression("TEST", DataType.String),
            BinaryOperator.Equal);

with ClientDataModule.tbl_ORDERS, DynamicWhere do begin
  Expression := NewBinaryExpression(
          NewFunctionCall(
            NewField('', 'customer_name'),
            dfkTrimLeft),
          NewConstant('TEST',datWideString),
          dboEqual);
end;

myTable.dynamicWhere = new RemObjects.DataAbstract.DynamicWhere(
      new RemObjects.DataAbstract.BinaryExpression(
        new RemObjects.DataAbstract.FunctionCallExpression(
          "TrimLeft",
          new RemObjects.DataAbstract.FieldExpression("customer_name")),
        new RemObjects.DataAbstract.ConstantExpression("String", "TEST")
        "Equal")
      );

Generated XML/JSON

<?xml version="1.0"?>
<query xmlns="http://www.remobjects.com/schemas/dataabstract/queries/5.0" version="5.0">
  <where>
    <binaryoperation operator="Equal">
      <function kind="TrimLeft">
        <field>customer_name</field>
      </function>
      <constant type="WideString" null="0">TEST</constant>
    </binaryoperation>
  </where>
</query>

{
  "type": "query.where",
  "expression": {
    "type": "binaryoperation",
    "left": {
      "type": "function",
      "kind": "TrimLeft",
      "expression": {
        "type": "field",
        "field": "customer_name"
      }
    },
    "operator": "Equal",
    "right": {
      "type": "constant",
      "datatype": "WideString",
      "value": "TEST"
    }
  }
}