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compiler.js
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compiler.js
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// MSSQL Query Compiler
// ------
const QueryCompiler = require('../../../query/compiler');
const { isEmpty, compact, identity } = require('lodash');
const components = [
'columns',
'join',
'lock',
'where',
'union',
'group',
'having',
'order',
'limit',
'offset',
];
class QueryCompiler_MSSQL extends QueryCompiler {
constructor(client, builder) {
super(client, builder);
this._emptyInsertValue = 'default values';
}
select() {
const sql = this.with();
const statements = components.map((component) => this[component](this));
return sql + compact(statements).join(' ');
}
// Compiles an "insert" query, allowing for multiple
// inserts using a single query statement.
insert() {
const insertValues = this.single.insert || [];
let sql = this.with() + `insert into ${this.tableName} `;
const { returning } = this.single;
const returningSql = returning
? this._returning('insert', returning) + ' '
: '';
if (Array.isArray(insertValues)) {
if (insertValues.length === 0) {
return '';
}
} else if (typeof insertValues === 'object' && isEmpty(insertValues)) {
return {
sql: sql + returningSql + this._emptyInsertValue,
returning,
};
}
const insertData = this._prepInsert(insertValues);
if (typeof insertData === 'string') {
sql += insertData;
} else {
if (insertData.columns.length) {
sql += `(${this.formatter.columnize(insertData.columns)}`;
sql += `) ${returningSql}values (`;
let i = -1;
while (++i < insertData.values.length) {
if (i !== 0) sql += '), (';
sql += this.formatter.parameterize(
insertData.values[i],
this.client.valueForUndefined
);
}
sql += ')';
} else if (insertValues.length === 1 && insertValues[0]) {
sql += returningSql + this._emptyInsertValue;
} else {
sql = '';
}
}
return {
sql,
returning,
};
}
// Compiles an `update` query, allowing for a return value.
update() {
const top = this.top();
const withSQL = this.with();
const updates = this._prepUpdate(this.single.update);
const join = this.join();
const where = this.where();
const order = this.order();
const { returning } = this.single;
return {
sql:
withSQL +
`update ${top ? top + ' ' : ''}${this.tableName}` +
' set ' +
updates.join(', ') +
(returning ? ` ${this._returning('update', returning)}` : '') +
(join ? ` from ${this.tableName} ${join}` : '') +
(where ? ` ${where}` : '') +
(order ? ` ${order}` : '') +
(!returning ? this._returning('rowcount', '@@rowcount') : ''),
returning: returning || '@@rowcount',
};
}
// Compiles a `delete` query.
del() {
// Make sure tableName is processed by the formatter first.
const withSQL = this.with();
const { tableName } = this;
const wheres = this.where();
const { returning } = this.single;
return {
sql:
withSQL +
`delete from ${tableName}` +
(returning ? ` ${this._returning('del', returning)}` : '') +
(wheres ? ` ${wheres}` : '') +
(!returning ? this._returning('rowcount', '@@rowcount') : ''),
returning: returning || '@@rowcount',
};
}
// Compiles the columns in the query, specifying if an item was distinct.
columns() {
let distinctClause = '';
if (this.onlyUnions()) return '';
const top = this.top();
const columns = this.grouped.columns || [];
let i = -1,
sql = [];
if (columns) {
while (++i < columns.length) {
const stmt = columns[i];
if (stmt.distinct) distinctClause = 'distinct ';
if (stmt.distinctOn) {
distinctClause = this.distinctOn(stmt.value);
continue;
}
if (stmt.type === 'aggregate') {
sql.push(...this.aggregate(stmt));
} else if (stmt.type === 'aggregateRaw') {
sql.push(this.aggregateRaw(stmt));
} else if (stmt.value && stmt.value.length > 0) {
sql.push(this.formatter.columnize(stmt.value));
}
}
}
if (sql.length === 0) sql = ['*'];
return (
`select ${distinctClause}` +
(top ? top + ' ' : '') +
sql.join(', ') +
(this.tableName ? ` from ${this.tableName}` : '')
);
}
_returning(method, value) {
switch (method) {
case 'update':
case 'insert':
return value
? `output ${this.formatter.columnizeWithPrefix('inserted.', value)}`
: '';
case 'del':
return value
? `output ${this.formatter.columnizeWithPrefix('deleted.', value)}`
: '';
case 'rowcount':
return value ? ';select @@rowcount' : '';
}
}
// Compiles a `truncate` query.
truncate() {
return `truncate table ${this.tableName}`;
}
forUpdate() {
// this doesn't work exacltly as it should, one should also mention index while locking
// https://stackoverflow.com/a/9818448/360060
return 'with (UPDLOCK)';
}
forShare() {
// http://www.sqlteam.com/article/introduction-to-locking-in-sql-server
return 'with (HOLDLOCK)';
}
// Compiles a `columnInfo` query.
columnInfo() {
const column = this.single.columnInfo;
let schema = this.single.schema;
// The user may have specified a custom wrapIdentifier function in the config. We
// need to run the identifiers through that function, but not format them as
// identifiers otherwise.
const table = this.client.customWrapIdentifier(this.single.table, identity);
if (schema) {
schema = this.client.customWrapIdentifier(schema, identity);
}
let sql = `select * from information_schema.columns where table_name = ? and table_catalog = ?`;
const bindings = [table, this.client.database()];
if (schema) {
sql += ' and table_schema = ?';
bindings.push(schema);
} else {
sql += ` and table_schema = 'dbo'`;
}
return {
sql,
bindings: bindings,
output(resp) {
const out = resp.reduce(function(columns, val) {
columns[val.COLUMN_NAME] = {
defaultValue: val.COLUMN_DEFAULT,
type: val.DATA_TYPE,
maxLength: val.CHARACTER_MAXIMUM_LENGTH,
nullable: val.IS_NULLABLE === 'YES',
};
return columns;
}, {});
return (column && out[column]) || out;
},
};
}
top() {
const noLimit = !this.single.limit && this.single.limit !== 0;
const noOffset = !this.single.offset;
if (noLimit || !noOffset) return '';
return `top (${this.formatter.parameter(this.single.limit)})`;
}
limit() {
return '';
}
offset() {
const noLimit = !this.single.limit && this.single.limit !== 0;
const noOffset = !this.single.offset;
if (noOffset) return '';
let offset = `offset ${
noOffset ? '0' : this.formatter.parameter(this.single.offset)
} rows`;
if (!noLimit) {
offset += ` fetch next ${this.formatter.parameter(
this.single.limit
)} rows only`;
}
return offset;
}
}
// Set the QueryBuilder & QueryCompiler on the client object,
// in case anyone wants to modify things to suit their own purposes.
module.exports = QueryCompiler_MSSQL;