@sap/xsodata/lib/sql/createDeleteLinksStatements.js

Expose data from a HANA database as OData V2 service with help of .xsodata files.

'use strict';

var linksSQL = require ('./createLinksSQLStatements_1_n');
var sql = require('./sqlStatement');


exports.createDeleteLinksStatementsCreateTmpTables = function (context, asyncDone) {
	linksSQL.createLinksStatementsCreateTmpTables (context, true);
	return asyncDone(null, context);
};

exports.createDeleteLinksStatementsInsert = function (context, asyncDone) {
    linksSQL.createLinksStatementsInsert(context, true);
    return asyncDone(null, context);
};
/******************** MxN relationships ***********************/

exports.createDeleteLinksMNStatementsCreateTmpTables = function (context, asyncDone) {
    var dbSegLast = context.oData.dbSegmentLast,
	    sqlContext = linksSQL.createMNSQLContext(context, dbSegLast);

    context.sql = sqlContext;
    dbSegLast.sql.stmContainer = new sql.PostContainer();

    // set Hana Cloud / Service context in SQL context; default == cloud
    let isHanaCloudDb = true;
    if (context.db !== undefined && context.db.isHanaCloudDb !== undefined) {
        isHanaCloudDb = context.db.isHanaCloudDb;
    }
    context.sql.isHanaCloudDb = isHanaCloudDb;

    createMNDeleteStatementContainerCreateTmpTables(sqlContext);
    return asyncDone(null, context);
};

exports.createDeleteLinksMNStatementsInsert = function (context, asyncDone) {
    const sqlContext = context.sql;

    createMNDeleteStatementContainerInsert(sqlContext);
    return asyncDone(null, context);
};
function createMNDeleteStatementContainerCreateTmpTables(sqlContext) {
    linksSQL.createMNStatementContainerCreateTmpTables(sqlContext);
}

function createMNDeleteStatementContainerInsert(sqlContext) {
    var dbSeg = sqlContext.dbSegLast;

    linksSQL.createMNStatementContainerInsert(sqlContext);

    //create insert statement for master table
    dbSeg.sql.stmContainer.insertTmp = masterMNTableInsertToDel(sqlContext, dbSeg.sql.rId);

    //create insert statement for master table
    dbSeg.sql.stmContainer.delete = masterMNTableDelete(sqlContext, dbSeg.sql.rId);
}

function masterMNTableInsertToDel(sqlContext, rId) {
    sqlContext.context.logger.debug('createDeleteLinksStatements', 'masterMNTableInsertToDel');
    var dbSeg = sqlContext.dbSegLast;

    var subSelect = new sql.Select();
    subSelect.addSelects(dbSeg.getSelectFragmentsForOverProperties(''));
    subSelect.setFrom( {table: dbSeg.getOver().object} );
    subSelect.addWhereKeyValuePairs(dbSeg.getOverPropertiesWithValues());

    var stm = new sql.Insert();
    stm.setTableName({table: rId});
    stm.setSubSelect(subSelect);

    return stm;
}

function masterMNTableDelete(sqlContext) {
    sqlContext.context.logger.debug('createDeleteLinksStatements', 'masterMNTableDelete');
    var dbSeg = sqlContext.dbSegLast;

    var deleteStmt = new sql.Delete();
    deleteStmt.setFrom( {table: dbSeg.getOver().object} );

    deleteStmt.addWhereKeyValuePairs(dbSeg.getOverPropertiesWithValues());

    return deleteStmt;
}