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- 1. SQL HiA Kap 12 Dynamisk SQL
- 2. SQL HiA
- 3. SQL HiA Flerbrukersystem Client / Server DatabaseDBMSDBMS Application_2Application_2 SQL-Request Data Application_3Application_3 Application_1Application_1 Client Server
- 4. SQL HiA Resultatsett DatabaseDBMSDBMS ApplicationApplication SQL-Request Data SELECT SNr, Navn, PNr FROM Selger WHERE PNr = 6400 SNr Navn PNr 5 Nilsen 5002 2 Olsen 6400 1 Hansen 9000 4 Berg 6400 Tabellen Selger SNr Navn PNr 2 Olsen 6400 4 Berg 6400 Resultatsett Client Server Fetch RowID FetchThrough
- 5. SQL HiA RowID RowID SNr Navn PNr CAAD 5 Nilsen 5002 BACV 2 Olsen 6400 ERCB 1 Hansen 9000 EADD 4 Berg 6400 Selger (ID = SNr) SNr Navn PNr 5 Nilsen 5002 2 Olsen 6400 1 Hansen 9000 4 Berg 6400 Selger (ID = SNr) Et eksempel på en 3NF-tabell Selger med tre kolonner SNr, Navn og PNr RowID er en ekstra kolonne i hver tabell som alltid kommer i tillegg til de kolonnene vi eksplisitt definerer. RowID er entydig for hver rad og fungerer som en slags identifikator.
- 6. SQL HiA
- 7. SQL HiA Statisk SQL SNrID Navn PNr 5 Nilsen 5002 2 Olsen 6400 1 Hansen 9000 4 Berg 6400 Selger (ID = SNr) SNrID Navn PNr Select SELECT SNrID, Navn, PNr FROM Selger Set sSelect = ‘SELECT SNrID, Navn, PNr INTO :dfnSNrID, :dfsNavn, dfnPNr FROM Selger’ Call SqlPrepare ( hSql, sSelect ) Call SqlExecute ( hSql ) Call SqlFetchNext ( hSql, nFetch )
- 8. SQL HiA Statisk SQL SNrID Navn PNr Select SELECT SNrID, Navn, PNr FROM Selger SNrID Navn PNr 2 Select SELECT Navn, PNr FROM Selger WHERE SNrID = :dfnSNrID SNrID Navn PNr 6400 Select SELECT SNrID, Navn FROM Selger WHERE PNr = :dfnPNr SNrID Navn PNr Nilsen Select SELECT SNrID, PNr FROM Selger WHERE Navn = :dfsNavn SNrID Navn PNr Nilsen 6400 Select SELECT Navn, PNr FROM Selger WHERE Navn = :dfsNavn AND PNr = : dfnPNr SNrID Navn PNr %sen 6400 Select SELECT SNrID, Navn FROM Selger WHERE Navn LIKE ‘ || ‘’’ || dfsNavn || ‘’’ AND PNr = :dfnPNr
- 9. SQL HiA Fra Statisk SQL til Dynamisk SQL SNrID Navn PNr 6400 Select SELECT SNrID, Navn, PNr FROM Selger WHERE PNr = :dfnPNr Set sSelect = ‘SELECT SNrID, Navn, PNr INTO :dfnSNrID, :dfsNavn, dfnPNr FROM Selger WHERE PNr = :dfnPNr’ Set sSelect = ‘SELECT ‘ || sColumn || ‘ INTO ‘ || sInto || ‘ FROM ‘ || sFrom ‘ WHERE ‘ || sWhere frmSelger sColumn = ‘SNrID, Navn, PNr’ sInto = ‘ :dfnSNrID, :dfsNavn, :dfnPNr’ sFrom = ‘Selger’ sWhere = ‘PNr = :dfnPNr’
- 10. SQL HiA Dynamisk SQL - Initier SQL-variable SNrID Navn PNr 6400 Select frmSelger dfnSNrID dfsNavn dfnPNr pbSelect pbSelect On SAM_Click Call SalSendMsg ( hWndForm, PAM_SELECT, 0, 0 ) frmSelger Message Actions On PAM_SELECT Set sColumn = ‘‘ Set sInto = ‘‘ Set sFrom = ‘‘ Set sWhere = ‘‘ Call SalSendMsg ( hWndForm, PAM_SQL, 0, 0 ) Call SalSendMsgToChildren ( hWndForm, PAM_SQL, 0, 0 ) 1 2
- 11. SQL HiA Dynamisk SQL - Bestem tabell-navn SNrID Navn PNr 6400 Select frmSelger dfnSNrID dfsNavn dfnPNr pbSelect frmSelger Message Actions On PAM_SELECT Set sColumn = ‘‘ Set sInto = ‘‘ Set sFrom = ‘’ Set sWhere = ‘‘ Call SalSendMsgTo ( hWndForm, PAM_SQL, 0, 0 ) Call SalSendMsgToChildren ( hWndForm, PAM_SQL, 0, 0 ) ... On PAM_SQL Call SalGetWindowText ( hWndForm, sWName, 20 ) sFrom = SalStrRight ( sWName, SalStrLength(sWName) - 3 ) sWName = ‘frmSelger’ sFrom = ‘Selger’
- 12. SQL HiA Dynamisk SQL - Bestem SQL-variable for dfnSNrID SNrID Navn PNr 6400 Select frmSelger dfnSNrID dfsNavn dfnPNr pbSelect frmSelger Message Actions On PAM_SELECT Set sColumn = ‘‘ Set sInto = ‘‘ Set sFrom = ‘’ Set sWhere = ‘‘ Call SalSendMsgTo ( hWndForm, PAM_SQL, 0, 0 ) Call SalSendMsgToChildren ( hWndForm, PAM_SQL, 0, 0 ) ... sColumn = ‘ SNrID ’ sInto = ‘ :dfnSNrID ’
- 13. SQL HiA Dynamisk SQL - Bestem SQL-variable for dfsNavn SNrID Navn PNr 6400 Select frmSelger dfnSNrID dfsNavn dfnPNr pbSelect frmSelger Message Actions On PAM_SELECT Set sColumn = ‘‘ Set sInto = ‘‘ Set sFrom = ‘’ Set sWhere = ‘‘ Call SalSendMsgTo ( hWndForm, PAM_SQL, 0, 0 ) Call SalSendMsgToChildren ( hWndForm, PAM_SQL, 0, 0 ) ... sColumn = sColumn || ‘, ‘ || ‘ Navn ’ = ‘ SNrID, Navn ‘ sInto = sInto || ‘ :dfsNavn ’ = ‘ :dfnSNrID, :dfsNavn ‘
- 14. SQL HiA Dynamisk SQL - Bestem SQL-variable for dfnPNr SNrID Navn PNr 6400 Select frmSelger dfnSNrID dfsNavn dfnPNr pbSelect frmSelger Message Actions On PAM_SELECT Set sColumn = ‘‘ Set sInto = ‘‘ Set sFrom = ‘’ Set sWhere = ‘‘ Call SalSendMsgTo ( hWndForm, PAM_SQL, 0, 0 ) Call SalSendMsgToChildren ( hWndForm, PAM_SQL, 0, 0 ) ... sColumn = sColumn || ‘, ‘ || ‘ PNr ’ = ‘ SNrID, Navn, PNr ‘ sInto = sInto || ‘ :dfnPNr ’ = ‘ :dfnSNrID, :dfsNavn, :dfnPNr ‘ sWhere = sWhere || ‘ PNr = ‘ || ‘ :dfnPNr ‘ = ‘ PNr = :dfnPNr ‘ = ‘ PNr = 6400 ‘
- 15. SQL HiA Dynamisk SQL - Bestem SELECT-statement sSelect SNrID Navn PNr 6400 Select frmSelger dfnSNrID dfsNavn dfnPNr pbSelect frmSelger Message Actions On PAM_SELECT ... Call SalSendMsgToChildren ( hWndForm, PAM_SQL, 0, 0 ) Set sSelect = ‘SELECT ‘ || sColumn || ‘ INTO ‘ || sInto ‘ FROM ‘ || sFrom ‘ WHERE ‘ || sWhere ... sColumn = sColumn || ‘, ‘ || ‘ PNr ’ = ‘ SNrID, Navn, PNr ‘ sInto = sInto || ‘ :dfnPNr ’ = ‘ :dfnSNrID, :dfsNavn, :dfnPNr ‘ sWhere = sWhere || ‘ PNr = ‘ || ‘ :dfnPNr ‘ = ‘ PNr = :dfnPNr ‘ = ‘ PNr = 6400 ‘ sSelect = SELECT SNrID, Navn, PNr INTO :dfnSNrID, :dfsNavn, :dfnPNr FROM Selger WHERE PNr = 6400
- 16. SQL HiA
- 17. SQL HiA Generering av dynamisk SQL-statement PAM_SELECT PAM_UPDATE ... SQL Build SQL Build PAM_SELECT PAM_UPDATE ... 1 2 3 clsWndclsWnd Class Variables: sSql, sColumn, sInto, sTable, sWhere, sOrder, ... Mdi Frm
- 18. SQL HiA
- 21. SQL HiA Klasse-notasjon ClassName Class Variables Instance Variables Functions Messages
- 22. SQL HiA
- 23. SQL HiA clsSqlHandleStruct iv_hSql bhSqlStatus iv_hSql bhSqlStatus clsSqlHandleStruct Instance Variable SqlHandle True if iv_hSql is connected
- 25. SQL HiA clsWnd sMdiName sTopWndName sSql sColumn sInto sTable sWhere sOrder sOrderColumn sUpdateSet sInsertInto sInsertValue sDeleteValue sUpdates[1:*] hWndColSort bExists sTableArray[1:*] nTableArrayCont sFrom sConstraints sMdiName sTopWndName sSql sColumn sInto sTable sWhere sOrder sOrderColumn sUpdateSet sInsertInto sInsertValue sDeleteValue sUpdates[1:*] hWndColSort bExists sTableArray[1:*] nTableArrayCont sFrom sConstraints sItemName sDbTableName sDbColumnName sDbTableColumnName sItemName sDbTableName sDbColumnName sDbTableColumnName SetItemName SetDbTableName Set_TbName_ColName Set_TableArray Set_From_Constraints SetItemName SetDbTableName Set_TbName_ColName Set_TableArray Set_From_Constraints SAM_CreateSAM_Create clsWnd Set the name of an object (frmMain, dfs_Adr_PNr) dfs_Adr_PNr --> Adr dfs_Adr_PNr --> PNr Set the Array-values of different Tables in a SqlStatement Set the FROM Clause and the Constraint part of a SELECT SqlStatement Call SetItemName( )
- 26. SQL HiA clsWnd_Mdi / clsWnd_TopLevel SAM_CreateSAM_Create clsWnd_Mdi SetTopWndName Get_SqlHandle SQL_Build SQL_Select SQL_Insert SQL_Update SQL_Delete Clear Help_TopWindow SetTopWndName Get_SqlHandle SQL_Build SQL_Select SQL_Insert SQL_Update SQL_Delete Clear Help_TopWindow SAM_Create PAM_SELECT PAM_UPDATE PAM_INSERT PAM_DELETE PAM_CLEAR PAM_HELP SAM_Close SAM_Create PAM_SELECT PAM_UPDATE PAM_INSERT PAM_DELETE PAM_CLEAR PAM_HELP SAM_Close clsWnd_TopLevel
- 27. SQL HiA clsMdi / clsFrm / clsTbl hSqlDbhSqlDb clsMdi hSqlSelect hSqlUpdate hSqlInsert hSqlDelete hSql nFetch hSqlSelect hSqlUpdate hSqlInsert hSqlDelete hSql nFetch Set_SqlHandle Get_SqlHandle Select_Inst Update_Inst Insert_Inst Delete_Inst Clear Set_SqlHandle Get_SqlHandle Select_Inst Update_Inst Insert_Inst Delete_Inst Clear SAM_Create PAM_FIRST PAM_PREVIOUS PAM_NEXT PAM_LAST SAM_Create PAM_FIRST PAM_PREVIOUS PAM_NEXT PAM_LAST clsFrm hSqlTblhSqlTbl Get_SqlHandle Select_Inst Update_Inst Insert_Inst Delete_Inst SQL_SelectSort Clear Get_SqlHandle Select_Inst Update_Inst Insert_Inst Delete_Inst SQL_SelectSort Clear SAM_Create PAM_SORT PAM_NEWROW SAM_Create PAM_SORT PAM_NEWROW clsTbl
- 28. SQL HiA clsWnd_ChildObject / clsWnd_DfCmbMiCol sParentNamesParentName clsWnd_ChildObject sItemValuesItemValue Sql Sql_Select Sql_Update Sql_Insert Get_Equal Get_MyValue Sql Sql_Select Sql_Update Sql_Insert Get_Equal Get_MyValue SAM_Create PAM_SQL PAM_CLEAR SAM_Create PAM_SQL PAM_CLEAR clsWnd_DfCmbMiCol
- 33. SQL HiA MdiWindow / FormWindow / TableWindow clsSqlDbAccess: hSqlDbclsSqlDbAccess: hSqlDb clsSqlDbAccess clsSqlDbAccess clsWnd_TopLevel clsWnd_TopLevel clsMdi clsWnd_Mdi clsWnd_Mdi clsFrm clsFrm clsTbl clsTbl
- 34. SQL HiA Bruk av virtuelle funksjons-kall f1f1 f1f1 f1f1 f1f1 f1f1 f1f1 f1f1 Call SalSendMsg(Obj1, Msg1…) On Msg1 Call ..f1(…)
- 35. SQL HiA Navn-setting frmSelger cmb_Selger_SNrID ComboBox Tabell-Navn Kolonne-navn dfs_Selger_RowIDSkjult RowID
- 36. SQL HiA UPDATE clsFrm Update Call Execute (hSqlUpdate) Call SqlSetParameter ( hSqlSelect, DBP_FETCHTHROUGH, TRUE, ‘‘) Call FetchRow_Through ( hSqlSelect, nFetchRowNumber, nInd) Call SqlSetParameter ( hSqlSelect, DBP_FETCHTHROUGH, FALSE, ‘‘) UPDATE Selger SET Navn = :cmb_Selger_Navn, PNr = :cmb_Selger_PNr WHERE ROWID = :dfs_Selger_RowID
- 37. SQL HiA End
Hinweis der Redaktion
- SQL er standard databasespråk for relasjons-databaser.