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loopback-connector-mysql
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feat: fetch index information for columns 

Signed-off-by: Muhammad Aaqil <aaqilcs102@gmail.com>
This commit is contained in:
Muhammad Aaqil 2024-10-13 23:17:13 +05:00
parent 9f21dee283
commit 6af3b7cf98
1 changed files with 80 additions and 27 deletions
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107
lib/discovery.js
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@ -157,34 +157,87 @@ function mixinDiscovery(MySQL, mysql) {
MySQL.prototype.buildQueryColumns = function(schema, table, options = {}) {
let sql = null;
if (schema) {
sql = paginateSQL('SELECT table_schema AS "owner",' +
' table_name AS "tableName",' +
' column_name AS "columnName",' +
' data_type AS "dataType",' +
' character_maximum_length AS "dataLength",' +
' numeric_precision AS "dataPrecision",' +
' numeric_scale AS "dataScale",' +
' column_type AS "columnType",' +
' is_nullable = \'YES\' AS "nullable",' +
' CASE WHEN extra LIKE \'%auto_increment%\' THEN 1 ELSE 0 END AS "generated"' +
' FROM information_schema.columns' +
' WHERE table_schema=' + mysql.escape(schema) +
(table ? ' AND table_name=' + mysql.escape(table) : ''),
'table_name, ordinal_position', {});
sql = paginateSQL(
`SELECT
c.table_schema AS "owner",
c.table_name AS "tableName",
c.column_name AS "columnName",
c.data_type AS "dataType",
c.character_maximum_length AS "dataLength",
c.numeric_precision AS "dataPrecision",
c.numeric_scale AS "dataScale",
c.column_type AS "columnType",
c.is_nullable = 'YES' AS "nullable",
CASE WHEN c.extra LIKE '%auto_increment%' THEN 1 ELSE 0 END AS "generated",
s.index_name AS "indexName",
s.non_unique AS "nonUnique",
s.seq_in_index AS "seqInIndex",
s.cardinality AS "cardinality",
s.index_type AS "indexType",
CASE WHEN fk.column_name IS NOT NULL THEN 1 ELSE 0 END AS "isForeignKey" -- Flag for foreign key
FROM
information_schema.columns c
LEFT JOIN
information_schema.statistics s
ON
c.table_schema = s.table_schema
AND c.table_name = s.table_name
AND c.column_name = s.column_name
LEFT JOIN
information_schema.KEY_COLUMN_USAGE fk
ON
c.table_schema = fk.table_schema
AND c.table_name = fk.table_name
AND c.column_name = fk.column_name
AND fk.referenced_table_name IS NOT NULL -- Ensure it's a foreign key
WHERE
c.table_schema = ${mysql.escape(schema)}
${table ? ' AND c.table_name = ' + mysql.escape(table) : ''}
`,
'c.table_name, c.ordinal_position',
{},
);
} else {
sql = paginateSQL('SELECT table_schema AS "owner",' +
' table_name AS "tableName",' +
' column_name AS "columnName",' +
' data_type AS "dataType",' +
' character_maximum_length AS "dataLength",' +
' numeric_precision AS "dataPrecision",' +
' numeric_scale AS "dataScale",' +
' column_type AS "columnType",' +
' is_nullable = \'YES\' AS "nullable",' +
' CASE WHEN extra LIKE \'%auto_increment%\' THEN 1 ELSE 0 END AS "generated"' +
' FROM information_schema.columns' +
(table ? ' WHERE table_name=' + mysql.escape(table) : ''),
'table_name, ordinal_position', {});
sql = paginateSQL(
`SELECT
columns.table_schema AS "owner",
columns.table_name AS "tableName",
columns.column_name AS "columnName",
columns.data_type AS "dataType",
columns.character_maximum_length AS "dataLength",
columns.numeric_precision AS "dataPrecision",
columns.numeric_scale AS "dataScale",
columns.column_type AS "columnType",
columns.is_nullable = 'YES' AS "nullable",
CASE WHEN columns.extra LIKE '%auto_increment%' THEN 1 ELSE 0 END AS "generated",
indexes.index_name AS "indexName",
indexes.seq_in_index AS "indexColumnOrder",
indexes.non_unique AS "nonUnique",
indexes.cardinality AS "cardinality", -- Cardinality of the index
indexes.index_type AS "indexType", -- Type of the index
CASE WHEN fk.column_name IS NOT NULL THEN 1 ELSE 0 END AS "isForeignKey" -- Flag for foreign key
FROM
information_schema.columns AS columns
LEFT JOIN
information_schema.statistics AS indexes
ON
columns.table_schema = indexes.table_schema
AND columns.table_name = indexes.table_name
AND columns.column_name = indexes.column_name
LEFT JOIN
information_schema.KEY_COLUMN_USAGE AS fk
ON
columns.table_schema = fk.table_schema
AND columns.table_name = fk.table_name
AND columns.column_name = fk.column_name
AND fk.referenced_table_name IS NOT NULL -- Ensure it's a foreign key
WHERE
columns.table_schema = ${mysql.escape(schema)}
${table ? ' AND columns.table_name = ' + mysql.escape(table) : ''}
`,
'columns.table_name, columns.ordinal_position',
{},
);
}
if (options.orderBy) {
sql += ' ORDER BY ' + options.orderBy;