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Add support for ADD UNIQUE indexes #3

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Add support for ADD UNIQUE indexes #3

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61 changes: 56 additions & 5 deletions mysql2sqlite
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Original file line number Diff line number Diff line change
Expand Up @@ -150,18 +150,63 @@ inView != 0 { next }
alterTableName = ""
alterIndexName = ""
isAddIndex = 0

# Check if it's a single-line statement (ends with semicolon)
if( /;$/ ) {
# Process immediately

# Check if this is ADD INDEX or ADD UNIQUE
if( /ADD INDEX|add index|ADD UNIQUE|add unique/ ) {
isAddIndex = 1

# Extract table name
if( match( $0, /`[^`]+/ ) ){
alterTableName = substr( $0, RSTART+1, RLENGTH-1 )
}

# Extract index name
if( match( $0, /(ADD INDEX|add index|ADD UNIQUE|add unique) `[^`]+/ ) ){
indexMatch = substr( $0, RSTART, RLENGTH )
if( match( indexMatch, /`[^`]+$/ ) ){
alterIndexName = substr( indexMatch, RSTART+1, RLENGTH-1 )
}
}

# Extract column list
if( isAddIndex && alterTableName != "" && alterIndexName != "" ) {
if( match( alterStatement, /\([^)]+\)/ ) ){
columnList = substr( alterStatement, RSTART+1, RLENGTH-2 )
gsub( /[ \t\n\r]+/, " ", columnList )
gsub( /^ +| +$/, "", columnList )
gsub( /`/, "\"", columnList )

# Check if UNIQUE
uniquePrefix = ""
if( alterStatement ~ /ADD UNIQUE|add unique/ ) {
uniquePrefix = "UNIQUE "
}

print "CREATE " uniquePrefix "INDEX \"idx_" alterTableName "_" alterIndexName "\" ON \"" alterTableName "\" (" columnList ");"
}
}
}

# Reset
inAlterTable = 0
}
Comment on lines +154 to +196
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@XedinUnknown XedinUnknown Jan 29, 2026

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I don't really understand why all these lines need to be added: seems that unique indexes are handled a bit lower in this file.

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@dmytroun1q dmytroun1q Jan 29, 2026 •
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unfortunately, can't say too much about this, but as I see according to the search over the previous version - ADD UNIQUE / UNIQUE does not appear anywhere in a file and current include. I tested several times and no error occurs.


next
}

# Continue collecting ALTER TABLE statement lines
inAlterTable != 0 {
alterStatement = alterStatement " " $0

# Check if this is an ADD INDEX statement (might be on any line)
if( /ADD INDEX|add index/ ) {
# Check if this is an ADD INDEX or ADD UNIQUE statement (might be on any line)
if( /ADD INDEX|add index|ADD UNIQUE|add unique/ ) {
isAddIndex = 1
# Extract index name from this line
if( match( $0, /(ADD INDEX|add index) `[^`]+/ ) ){
if( match( $0, /(ADD INDEX|add index|ADD UNIQUE|add unique) `[^`]+/ ) ){
indexMatch = substr( $0, RSTART, RLENGTH )
if( match( indexMatch, /`[^`]+$/ ) ){
alterIndexName = substr( indexMatch, RSTART+1, RLENGTH-1 )
Expand All @@ -184,8 +229,14 @@ inAlterTable != 0 {
gsub( /^ +| +$/, "", columnList ) # trim leading/trailing spaces
gsub( /`/, "\"", columnList ) # convert backticks to double quotes

# Generate CREATE INDEX statement
print "CREATE INDEX \"idx_" alterTableName "_" alterIndexName "\" ON \"" alterTableName "\" (" columnList ");"
# Check if this is a UNIQUE constraint
uniquePrefix = ""
if( alterStatement ~ /ADD UNIQUE|add unique/ ) {
uniquePrefix = "UNIQUE "
}

# Generate CREATE INDEX statement (with UNIQUE if needed)
print "CREATE " uniquePrefix "INDEX \"idx_" alterTableName "_" alterIndexName "\" ON \"" alterTableName "\" (" columnList ");"
}
}
# If it's not an ADD INDEX, we just skip it
Expand Down