Created
August 21, 2012 15:09
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Awk script to generate SQL inserts from tab file
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#!/usr/bin/gawk -f | |
BEGIN { | |
if (!table) { | |
print "usage: generate_insert_statements.awk -v table=TARGET_TABLE_NAME [datafiles ...]" > "/dev/stderr" | |
failed = 1 | |
exit 1 | |
} | |
FS = FS ? FS : "\t" | |
freq = freq ? freq : 100 | |
} | |
NR == 1 { | |
column_count = split($0, columns) | |
insert_clause = "INSERT INTO " table " (" | |
for (i = 1; i < column_count; i++) | |
insert_clause = insert_clause columns[i] ", " | |
insert_clause = insert_clause columns[i] ") VALUES " | |
print "START TRANSACTION;" | |
} | |
NR > 1 { | |
values_clause = length($1) ? "('" $1 "'" : "NULL" | |
for (i = 2; i <= column_count; i++) { | |
value = length($i) ? "'" $i "'" : "NULL" | |
values_clause = values_clause ", " value | |
} | |
values_clause = values_clause ");" | |
print insert_clause values_clause | |
} | |
NR % freq == 0 { | |
print "COMMIT;" | |
print "START TRANSACTION;" | |
} | |
END { | |
if (!failed) | |
print "COMMIT;" | |
} |
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