On 04/02/2012 07:22 AM, Pete wrote:
I'm running into an issue with foreign keys where no matter what value I
supply for a child key, I get a foreign key mismatch error. Here are my
test tables.
"foreign key mismatch" indicates a schema problem. Usually a missing
index. See here:
http://www.sqlite.org/foreignkeys.html#fk_indexes
It's likely you need to create a UNIQUE index on t1.RefColumn.
CREATE TABLE "t1" ("RefColumn" TEXT ,"Data" TEXT )
CREATE TABLE "t2" ("FKeyColumn" TEXT REFERENCES "t1"("RefColumn"),"Data"
TEXT )
PRAGMA foreign_keys is set to 1.
Put a couple of entries into t1:
SELECT * FROM t1
RefColumn Data
---------- ----------
a aaa
b bbb
Now insert a row into t2
INSERT INTO t2 VALUES ('a','aaa');
I get a foreign Key mismatch error. No matter what value I supply for
FKeyColumn, even NULL, I get the same error.
I disabled foreign keys, then the INSERT worked. Enabled foreign keys
again, it fails again.
And even more concerning "DELETE FROM t2" also produces a foreign key
mismatch error.
What am I doing wrong?
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