Tun SQL â Data Access - Esker

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which doesn't correspond to the structure generated by the C-ISAMfiles the table is based on.In this case, there's a mismatch between the created table and the C-ISAM files it's based on.To verify that a table's data structure corresponds to the original C-ISAM files, choose Catalog#CheckDefine. To verify all the tables inthe database, choose Tools#Check Catalog.In our example, the Output window shows the following results:The following message is displayed:Table size different from file record size (55 60)"The message warns that table table2 was defined differently than the C-ISAM "filename" files it's based on. The define statement should be asfollows:define table table2 file is filename (field1 longint,field2 char(25), filler char(30));3 - 44 <strong>Data</strong> <strong>Access</strong> !
" Viewing a table's C structureYou can view a table's C structure, that is, the different columns created(name, data type and length), as well as the information concerning datamanagement (the primary keys, for example).To do that, choose Catalog#GetCStruct and enter the name of thetable whose C structure you want to view. To view the C structure of allthe tables in the database, choose Tools#List Structures.The example below shows the result of this command for a tablecreated with a primary key:The following statement creates the table:create table customer(cust_number longint,cust_name char(20),cust_address1 char(20),cust_address2 char(20),filler char(20),primary key (cust_number));The C structure generated is:struct doc_customer /* file "custome110" */{long lint_cust_number; /* cust_number longint */char chr_cust_name[20]; /* cust_name char(20) */char chr_cust_address1[20];/* cust_address1 char(20) */char chr_cust_address2[20];/* cust_address2 char(20) */char chr_filler[20]; /* filler char(20) */unsigned char null_flags[1]; /* reserved */};struct keydesc idx_customer_1;idx_customer_1.k_flags = ISNODUPS;idx_customer_1.k_nparts = 1;idx_customer_1.k_part[0].kp_start = 0;idx_customer_1.k_part[0].kp_leng = 4;idx_customer_1.k_part[0].kp_type = LONGTYPE;The first piece of code shows the structure of the table (the fields), thesecond shows the primary key and its various assignments.! C-ISAM 3 - 45
Page 1 and 2: Tun SQL - Data Access
Page 3 and 4: PREFACETun SQL - Data Access is an
Page 5 and 6: TABLE OF CONTENTSPART 1 PRESENTATIO
Page 7: PART 1PRESENTATION AND USE
Page 10 and 11: To compensate for the disadvantages
Page 12 and 13: The applications that make the leas
Page 14 and 15: UNIX ServerPC Client under WindowsD
Page 16 and 17: In addition to the security offered
Page 18 and 19: You use this utility to query a hos
Page 20: Using a proxy server firewallWhen y
Page 23 and 24: Configuring the data sourceClick th
Page 25 and 26: " Driver tabClick the Driver tab to
Page 27 and 28: Click the Row Limits tab to display
Page 29 and 30: Notes:In this chapter you were aske
Page 31 and 32: " ExecutionTo execute the SQL batch
Page 34 and 35: Run the program by clicking the Tun
Page 37 and 38: 3C-ISAMIntroduction to C-ISAM" The
Page 39 and 40: " Installing the C-ISAM driverTo in
Page 41 and 42: To do that, choose Database#Connect
Page 43: For example, the statement that cre
Page 47 and 48: You defined the table using the sta
Page 49: PART 2DATABASE REVAMPING
Page 52 and 53: The consequences of this are:• Im
Page 54 and 55: Each environment can be viewed as a
Page 57 and 58: 5TUN DB REVAMP GENERAL USEGeneral o
Page 59 and 60: Importing data source environmentsT
Page 61 and 62: If you want the virtual table to co
Page 63 and 64: Example 1:You have access to a real
Page 65 and 66: To assign a filter to a virtual fie
Page 67 and 68: • Click the Ins button to add the
Page 69 and 70: A pane opens below the real or virt
Page 71 and 72: On a request for environment valida
Page 73 and 74: Creating a virtual data sourceThe c
Page 75 and 76: " Reloading the database structureW
Page 77: PART 3APPENDICES
Page 80 and 81: CONFIG.XXXContains the working and
Page 82 and 83: DbmsName=DatabaseNameSets or change
Page 84 and 85: DBMAP" SyntaxWindows application fo
Page 86 and 87: DBSHOW" SyntaxWindows application f
Page 88 and 89: The columns required to view the di
Page 90 and 91: -c=config_fileAssociates a configur
Page 92 and 93: " Informix options-hBy default, Inf
Page 95 and 96:
BSQL STATEMENTS USED IN C-ISAMPrinc
Page 97 and 98:
CREATE DATABASE" Purpose" SyntaxCre
Page 99 and 100:
DEFINE TABLE" Purpose" SyntaxDefine
Page 101 and 102:
DEFAULT CLAUSE" Syntax" UseUsed in
Page 103 and 104:
CONSTRAINT DEFINITION SUBSET" Purpo
Page 105 and 106:
FILE IS OPTION" Purpose" Syntax" Us
Page 107 and 108:
CREATE SYNONYM" Purpose" SyntaxAttr
Page 109 and 110:
DROP DATABASE" Purpose" SyntaxRemov
Page 111 and 112:
DISCONNECT DATABASE" Purpose" Synta
Page 113 and 114:
DROP TABLE" Purpose" Syntax" UseDel
Page 115 and 116:
UNDEFINE TABLE" Purpose" SyntaxDele
Page 117 and 118:
SELECT CLAUSE" Syntax" UseUsed by t
Page 119 and 120:
FROM CLAUSE" Purpose" SyntaxUsed by
Page 121 and 122:
GROUP BY CLAUSE" Purpose" Syntax" U
Page 123 and 124:
ORDER BY CLAUSE" Purpose" Syntax" U
Page 125 and 126:
INSERT" Purpose" SyntaxInserts one
Page 127 and 128:
UPDATE" Purpose" SyntaxChanges the
Page 129 and 130:
AGGREGATE EXPRESSION" SyntaxUsed by
Page 131 and 132:
If the bit data type is used with D
Page 133 and 134:
When this type of data is used with
Page 135 and 136:
" The double typeThis type correspo
Page 137 and 138:
INDEXAllowed,82Arrayfields (Progres
Page 139:
Tables (C-ISAM),41time,130, 135time
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Tun SQL â Data Access - Esker