（转）Determining equivalent SQL and COBOL data types

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Determining equivalent SQL and COBOL data types

The precompiler determines the base SQLTYPE and SQLLEN of host variables based on this table. If a host variable appears with an indicator variable, the SQLTYPE is the base SQLTYPE plus one.

Table 1. COBOL declarations mapped to typical SQL data types

COBOL data type	SQLTYPE of host variable	SQLLEN of host variable	SQL data type
S9(i)V9(d) COMP-3 or S9(i)V9(d) COMP or S9(i)V9(d) PACKED-DECIMAL	484	i+d in byte 1, d in byte 2	DECIMAL(i+d,d)
S9(i)V9(d) DISPLAY SIGN LEADING SEPARATE	504	i+d in byte 1, d in byte 2	No exact equivalent use DECIMAL(i+d,d) or NUMERIC (i+d,d)
S9(i)V9(d)DISPLAY	488	i+d in byte 1, d in byte 2	NUMERIC(i+d,d)
S9(i) BINARY or S9(i) COMP-4 where i is from 1 to 4	500	2	SMALLINT
S9(i) BINARY or S9(i) COMP-4 where i is from 5 to 9	496	4	INTEGER
S9(i) BINARY or S9(i) COMP-4 where i is from 10 to 18.   Not supported by OPM COBOL.	492	8	BIGINT
S9(i)V9(d) BINARY or S9(i)V9(d) COMP-4 where i+d ≤ 4	500	i+d in byte 1, d in byte 2	No exact equivalent use DECIMAL(i+d,d) or NUMERIC (i+d,d)
S9(i)V9(d) BINARY or S9(i)V9(d) COMP-4 where 4 < i+d ≤ 9	496	i+d in byte 1, d in byte 2	No exact equivalent use DECIMAL(i+d,d) or NUMERIC (i+d,d)
COMP-1   Not supported by OPM COBOL.	480	4	FLOAT(single precision)
COMP-2   Not supported by OPM COBOL.	480	8	FLOAT(double precision)
Fixed-length character data	452	m	CHAR(m)
Varying-length character data	448	m	VARCHAR(m)
Fixed-length graphic data   Not supported by OPM COBOL.	468	m	GRAPHIC(m)
Varying-length graphic data   Not supported by OPM COBOL.	464	m	VARGRAPHIC(m)
DATE   Not supported by OPM COBOL.	384		DATE
TIME   Not supported by OPM COBOL.	388		TIME
TIMESTAMP   Not supported by OPM COBOL.	392	26	TIMESTAMP

The following table can be used to determine the COBOL data type that is equivalent to a given SQL data type.

Table 2. SQL data types mapped to typical COBOL declarations

SQL data type	COBOL data type	Notes
SMALLINT	S9(m) COMP-4	m is from 1 to 4
INTEGER	S9(m) COMP-4	m is from 5 to 9
BIGINT	S9(m) COMP-4 for ILE COBOL.   Not supported by OPM COBOL.	m is from 10 to 18
DECIMAL(p,s)	If p<64: S9(p-s)V9(s) PACKED-DECIMAL or S9(p-s)V9(s) COMP or S9(p-s)V9(s) COMP-3. If p>63: Not supported	p is precision; s is scale. 0<=s<=p<=63. If s=0, use S9(p) or S9(p)V. If s=p, use SV9(s).
NUMERIC(p,s)	If p<19: S9(p-s)V9(s) DISPLAY If p>18: Not supported	p is precision; s is scale. 0<=s<=p<=18. If s=0, use S9(p) or S9(p)V. If s=p, use SV9(s).
FLOAT(single precision)	COMP-1 for ILE COBOL.   Not supported by OPM COBOL.
FLOAT(double precision)	COMP-2 for ILE COBOL.   Not supported by OPM COBOL.
CHAR(n)	Fixed-length character string	32766≥n≥1
VARCHAR(n)	Varying-length character string	32740≥n≥1
CLOB	None	Use SQL TYPE IS to declare a CLOB for ILE COBOL.   Not supported by OPM COBOL.
GRAPHIC(n)	Fixed-length graphic string for ILE COBOL.   Not supported by OPM COBOL.	16383≥n≥1
VARGRAPHIC(n)	Varying-length graphic string for ILE COBOL.   Not supported by OPM COBOL.	16370≥n≥1
DBCLOB	None   Not supported by OPM COBOL.	Use SQL TYPE IS to declare a DBCLOB for ILE COBOL.
BINARY	None	Use SQL TYPE IS to declare a BINARY.
VARBINARY	None	Use SQL TYPE IS to declare a VARBINARY.
BLOB	None   Not supported by OPM COBOL.	Use SQL TYPE IS to declare a BLOB.
DATE	Fixed-length character string or DATE for ILE COBOL.	If the format is *USA, *JIS, *EUR, or *ISO, allow at least 10 characters. If the format is *YMD, *DMY, or *MDY, allow at least 8 characters. If the format is *JUL, allow at least 6 characters.
TIME	Fixed-length character string or TIME for ILE COBOL.	Allow at least 6 characters; 8 to include seconds.
TIMESTAMP	Fixed-length character string or TIMESTAMP for ILE COBOL.	n must be at least 19. To include microseconds at full precision, n must be 26. If n is less than 26, truncation occurs on the microseconds part.
DATALINK	Not supported
ROWID	None	Use SQL TYPE IS to declare a ROWID.

• Notes on COBOL variable declaration and usage
  Any level 77 data description entry can be followed by one or more REDEFINES entries. However, the names in these entries cannot be used in SQL statements.

Parent topic:  Coding SQL statements in COBOL applications