XSQL is especially efficient for data processing. In fact, it can even be used as an ETL tool, given the features it incorporates to facilitate transparent access to multiple databases.

1 DDL

1.1 Table

@ in Temporary Tables

Before creating a temporary table, we recommend users verify that it does not already exist in the database. To avoid overlapping temporary tables, @ is the recommended prefix placed before table names. This character is replaced, during execution time, by a suffix which guarantees the uniqueness of the table name.

Prefijo tmp_ en temporales

The prefix tmp_ is recommended for temporary tables in order to differentiate them from static tables.

1.2 Index

Creates an index in the specified table.

<index
    name='name'
    table='table'
    columns='columns'
    oracle='yes|no'
/>

Attributes
Name	Type	Required	Default	Description
Aname	string				Index name.
Atable	string				Table name.
Acolumns	string				Names of the columns which comprise the index.
Aoracle	string			yes	Indicates that the index should not be created if the RDBMS is Oracle.

Example

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<index name='@i_tmp_gadjudic1' table='@tmp_gadjudic' columns='codpri, fecha, cabres' />

1.3 Drop

This tag is used to remove tables from the database in which the statement is executed. It is composed of the following attributes:

<drop
    table='table'
    temp='y|n'
    onexception='ignore'
/>

Attributes
Name	Type	Required	Default	Description
Atable	string				Name of the table to be removed.
Atemp	string			n	"y" or "yes" to indicate that the table is temporary.
Aonexception	string				Allows any error in the table deletion to be ignored.

Example

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<drop table='galmacen' />

Example

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<drop table='@tmpalt_alm' temp='y' onexception='ignore' />
<table name='@tmpalt_alm' temp='yes'>
    <column name='almalt' type='char' size='12' required='y' />
    <column name='cuealt' type='char' size='4' required='y' />
    <column name='priori' type='decimal' size='12' required='y' />
</table>

Example

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<drop table='@tmp_display_aux' onexception='ignore'/>
<select intotemp='@tmp_display_aux'>
    <columns>
        a.codart, a.varlog, a.coduni, a.numlot,
        a.codean, <p_fecini /> fecmov
    </columns>
    <from table='@tmp_display' alias='a' />
    <where>
        a.fecmov BETWEEN <m_fecini /> AND <eval-date d='-1'><p_fecini /></eval-date>
    </where>
</select>